question_answer 1)
Which of the following is an example of an aldopentose?
A)
D-Ribose done
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B)
Glyceraldehyde done
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C)
Fructose done
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D)
Erythrose done
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question_answer 2)
Which of the following pair represent anomers?
A)
B)
C)
D)
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question_answer 3)
Match the sugars in column I with their types given in column II and mark the appropriate choice.
Column - I Column - II [A] Glucose (i) Ketohexose [B] Fructose (ii) Aldohexose [C] Ribose (iii) Aldotetrose [D] Erythrose (iv) Aldopentose
A)
[A] \[\to \] (iv), [B] \[\to \] (i), [C] \[\to \] (iii), [D] \[\to \] (ii) done
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B)
[A] \[\to \] (iii), [B] \[\to \] (iv), [C] \[\to \] (i), [D] \[\to \] (ii) done
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C)
[A] \[\to \] (i), [B] \[\to \](ii), [C] \[\to \] (iii), [D] \[\to \] (iv) done
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D)
[A] \[\to \] (ii), [B] \[\to \] (i), [C] \[\to \] (iv), [D]\[\to \] (iii) done
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question_answer 4)
Amino acids generally exist in the form of Zwitter ions. This means they contain
A)
basic \[-N{{H}_{2}}\] group and acidic COOH group done
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B)
the basic \[-\overset{+}{\mathop{N}}\,{{H}_{3}}\] group and acidic \[CO{{O}^{-}}\] group done
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C)
basic \[N{{H}_{2}}\] and acidic \[{{H}^{+}}\] group done
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D)
basic \[CO{{O}^{-}}\] group and acidic \[-\overset{+}{\mathop{N}}\,{{H}_{3}}\] group. done
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question_answer 5)
During acetylation of glucose it needs x moles of acetic anhydride. The value of x would be
A)
3 done
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B)
5 done
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C)
4 done
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D)
1 done
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question_answer 6)
Which compound can exist in a dipolar (zwitter ion) structure?
A)
\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}CH\left( N=C{{H}_{2}} \right)COOH\] done
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B)
\[{{\left(C{{H}_{3}} \right)}_{2}}CHCH\left( N{{H}_{2}} \right)COOH\] done
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C)
\[{{C}_{6}}{{H}_{5}}CONHC{{H}_{2}}COOH\] done
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D)
\[HOOCC{{H}_{2}}C{{H}_{2}}COCOOH\] done
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question_answer 7)
The given structures (I) and (II) represent configuration of the simplest sugar glycer-aldehyde. Which of the following statements is not correct for the structures?
\[\underset{\left( I \right)}{\mathop{H-\underset{\begin{smallmatrix} |\\ CH{{ }_{2}}OH \end{smallmatrix}}{\overset{\begin{smallmatrix} CHO\\ | \end{smallmatrix}}{\mathop{C}}}\,-OH}}\,\,\,\,\,\underset{\left( II \right)}{\mathop{HO-\underset{\begin{smallmatrix} |\\ CH{{ }_{2}}OH \end{smallmatrix}}{\overset{\begin{smallmatrix} CHO\\ | \end{smallmatrix}}{\mathop{C}}}\,-H}}\,\]
A)
(I) represents D-form while (II) represents L-form of glyceraldehyde. done
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B)
The sugars having same configuration as D-glyceraldehyde are designated as D-sugars. done
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C)
Natural glucose and fructose are D-forms. done
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D)
D is dextrorotatory while L is laevorotatory enantiomer. done
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question_answer 8)
Globular proteins are present in
A)
blood done
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B)
eggs done
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C)
milk done
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D)
all of these done
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question_answer 9)
The anomeric carbon in D(+) glucose is
A)
C-1 carbon done
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B)
C-2 carbon done
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C)
C-5 carbon done
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D)
C-6 carbon done
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question_answer 10)
In fibrous proteins, polypeptide chains are held together by
A)
van der waals forces done
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B)
eletrostatic forces of attraction done
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C)
hydrogen bonds done
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D)
covalent bonds. done
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question_answer 11)
Study the structures of \[\alpha \]-D - (+) glucopyranose and \[\beta \]- D(+) glucopyranose and mark the correct
A)
Structures I and II are enantiomers. done
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B)
Structures I and II are anomers. done
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C)
The two structures I and II differ in the configuration of \[{{C}_{1}}\] and \[{{C}_{4}}\]. done
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D)
Both the structures I and II give 2, 4-DNP test. done
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question_answer 12)
Match the column I with column II and mark the appropriate choice.
Column I Column II [A] Nucleoside (i) Sugar + base + phosphoric acid group [B] Nucleotide (ii) Cytosine + uracil [C] DNA (iii) Sugar + base [D] RNA (iv) Cytosine + thymine
A)
[A] \[\to \] (iii), [B] \[\to \] (i), [C] \[\to \] (iv), [D] \[\to \] (ii) done
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B)
[A] \[\to \] (i), [B] \[\to \] (iv), [C] \[\to \] (iii), [D] \[\to \] (ii) done
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C)
[A] \[\to \] (ii), [B] \[\to \] (iii), [C] \[\to \] (i), [D] \[\to \] (iv) done
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D)
[A] \[\to \] (iv), [B] \[\to \] (ii), [C] \[\to \] (i), [D] \[\to \] (iii) done
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question_answer 13)
A unit in nucleic acid which contains 'base- sugar phosphate' unit is called
A)
nucleotide done
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B)
nucleoside done
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C)
phosphotide done
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D)
polypeptide. done
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question_answer 14)
The general formula of carbohydrates is
A)
\[{{C}_{n}}{{H}_{2n+1}}O\] done
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B)
\[{{C}_{n}}{{H}_{2n}}O\] done
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C)
\[{{C}_{x}}{{\left( {{H}_{2}}O \right)}_{y}}\] done
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D)
\[{{C}_{n}}{{\left( {{H}_{2}}O \right)}_{2n}}\] done
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question_answer 15)
If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be
A)
TCCGAACT done
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B)
TACGTAGT done
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C)
TACGAATC done
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D)
TACGAACT done
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question_answer 16)
Glucose \[\xrightarrow{B{{r}_{2}}\,water}\] product is
A)
hexanoic acid done
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B)
gluconic acid done
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C)
saccharic acid done
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D)
bromohexane. done
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question_answer 17)
Primary structure of a protein is
A)
sequence in which \[\alpha \]-amino acids are linked to one another done
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B)
sequence in which amino acids of one polypeptide chain are joined to other chain done
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C)
the folding patterns of polypeptide chains done
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D)
the pattern in which the polypeptide chains are arranged. done
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question_answer 18)
When adenine is attached to ribose sugar, it is called adenosine. To make a nucleotide from it, would require
A)
oxygenation done
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B)
addition of a base done
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C)
addition of phosphate done
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D)
hydrogenation. done
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question_answer 19)
Which one of the amino acids can be synthesised in the body?
A)
Alanine done
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B)
Lysine done
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C)
Valine done
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D)
Histidine done
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question_answer 20)
Among the following statements about the molecules X and Y, which is incorrect ?
A)
X and Y are diastereomers. done
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B)
X and Y are enantiomers. done
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C)
X and Y are both aldohexoses. done
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D)
X is a D-sugar and Y is L-sugar. done
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question_answer 21)
Which of the following is not true about amino acids?
A)
They are constituents of all proteins. done
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B)
Alanine having one amino and one carboxylic group. done
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C)
Most naturally occurring amino acids have D-configuration. done
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D)
Glycine is the only naturally occurring amino acid which is optically inactive. done
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question_answer 22)
Five-membered ring structures of fructose are given below. Mark the incorrect statement.
A)
The five-membered ring structures are named as furanose structures. done
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B)
The cyclic structures represent two anomers of fructose. done
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C)
Five-membered ring structures are named as pyranose structures. done
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D)
These are also called Haworth structures. done
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question_answer 23)
Which of the following represents a peptide chain?
A)
\[-NH-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-\underset{|}{\overset{|}{\mathop{C}}}\,-NH-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-\] done
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B)
\[-NH-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-C{{H}_{2}}C{{H}_{2}}-NH-C{{H}_{2}}C{{H}_{2}}-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-\] done
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C)
\[-NH-C{{H}_{2}}-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-C{{H}_{2}}-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-C{{H}_{2}}-\] done
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D)
\[-NH-C{{H}_{2}}C{{H}_{2}}-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-NH-C{{H}_{2}}-\underset{\begin{smallmatrix} ||\\ O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-\] done
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question_answer 24)
Which of the following statements is not correct?
A)
Only \[\alpha \]-amino acids are obtained on hydrolysis of proteins. done
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B)
The ammo acids which are synthesised in the body are known as non-essential amino acids. done
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C)
There are 20 essential amino acids. done
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D)
L-amino acids are represented by writing the \[N{{H}_{2}}\] group on the left side. done
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question_answer 25)
Which of the following statements is not true?
A)
Glucose and fructose both are monosaccharides. done
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B)
The natural glucose and fructose are D-forms. done
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C)
The solution having equal molecules of D-glucose and D-fructose is termed as invert sugar. done
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D)
Aldohexoses exist in \[{{2}^{6}}\]optical forms. done
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question_answer 26)
The melting points of amino acids are higher than the corresponding halo-acids because
A)
amino acids exist as zwitter ions resulting in strong dipole - dipole attraction done
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B)
amino acids are optically active done
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C)
due to higher molecular mass of \[-N{{H}_{2}}\] group molecular mass of amino acids is higher done
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D)
they interact with water more than halo - acids and have salt like structure. done
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question_answer 27)
Which of the following is not a function of proteins?
A)
Formation of hair, wool, skin and nails. done
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B)
As a biological catalysts in the form of enzymes. done
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C)
As food in the form of meat, eggs. done
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D)
As energy provider for metabolism. done
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question_answer 28)
Which of the following statements is not correct?
A)
Proteins are polyamides formed from amino acids. done
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B)
Except glycine, all other amino acids show optical activity. done
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C)
Natural proteins are commonly made up of L-isomer of amino acids. done
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D)
In a-amino acids, \[-N{{H}_{2}}\] and \[-COOH\] groups are attached to different carbon atoms. done
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question_answer 29)
Which of the following bases is not present in RNA?
A)
Adenine done
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B)
Guanine done
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C)
Cytosine done
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D)
Thymine done
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question_answer 30)
Secondary structure of protein refers to
A)
sequence of amino acids in polypeptide chain done
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B)
bonds between alternate polypeptide chains done
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C)
folding patterns of polypeptide chain done
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D)
bonding between \[NH_{3}^{+}\] and \[CO{{O}^{-}}\] of two peptides. done
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question_answer 31)
In DNA, the complimentary bases are
A)
uracil and adenine, cytosine and guanine done
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B)
adenine and thymine, guanine and cytosine done
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C)
adenine and thymine, guanine and uracil done
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D)
adenine and guanine, thymine and cytosine. done
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question_answer 32)
The peptide linkage formed between glycine \[\left( N{{H}_{2}}C{{H}_{2}}COOH \right)\]and alanine (\[N{{H}_{2}}\underset{\begin{smallmatrix} |\\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-COOH\]) to give glycylalanine can be shown as
A)
\[N{{H}_{2}}-C{{H}_{2}}-NH-\underset{\begin{smallmatrix} |\\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-COOH\] done
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B)
\[N{{H}_{2}}-C{{H}_{2}}-CONH-\underset{\begin{smallmatrix} |\\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-COOH\] done
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C)
\[{{H}_{2}}NCOC{{H}_{2}}-\underset{\begin{smallmatrix} |\\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-CONH\] done
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D)
\[HOOC-C{{H}_{2}}-NH-NH-\underset{\begin{smallmatrix} |\\ C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-COOH\] done
clear
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question_answer 33)
Number of stereocentres present in linear and cyclic structures of glucose are respectively.
A)
4 and 4 done
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B)
4 and 5 done
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C)
5 and 5 done
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D)
5 and 4 done
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question_answer 34)
Which type of interactions are responsible for making the a-helix structure stable?
A)
Peptide bonds between \[-N{{H}_{2}}\] and \[CO\] groups of adjacent carbon chains. done
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B)
Hydrogen bonds between NH of amino acid in one turn with CO of amino acid to adjacent turn. done
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C)
OH group of one amino acid with CO group of other amino acid on the turn. done
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D)
Hydrogen bonds between adjacent amino acids. done
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question_answer 35)
Proteins are condensation polymers of
A)
\[\alpha \]-amino acids done
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B)
\[\beta \]-amino acids done
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C)
\[\alpha \]-hydroxy acids done
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D)
\[\beta \]-hydroxy acids. done
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question_answer 36)
Which of the following reactions could not be explained on the basis of open chain structure of glucose?
A)
Pentaacetate of glucose does not react with \[N{{H}_{2}}OH\]. done
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B)
Glucose on prolonged heating with HI gives n-hexane. done
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C)
Glucose on oxidation with bromine water forms gluconic acid. done
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D)
With acetic anhydride glucose gives pentaacetate. done
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question_answer 37)
Denaturation of protein leads to loss of its biological activity by
A)
formation of amino acids done
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B)
loss of primary structure done
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C)
loss of both primary and secondary structure done
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D)
loss of both secondary and tertiary structure. done
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question_answer 38)
Which of the following is an acidic amino acid?
A)
Glycine done
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B)
Valine done
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C)
Leucine done
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D)
Glutamic acid done
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question_answer 39)
Bases common to RNA and DNA are
A)
adenine, guanine, cytosine done
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B)
adenine, uracil, cytosine done
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C)
adenine, guanine, thymine done
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D)
guanine, uracil, thymine. done
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question_answer 40)
How many C-atoms are involve in a pyranose ring?
A)
3 done
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B)
5 done
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C)
6 done
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D)
7 done
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question_answer 41)
Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?
A)
5' and 3' done
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B)
1' and 5' done
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C)
5' and 5' done
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D)
3' and 3' done
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question_answer 42)
On boiling the egg, what structural changes are taking place in the egg white?
A)
The colour of the egg changes from colourless to white. done
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B)
\[2{}^\circ \]and \[3{}^\circ \] structures are destroyed but \[1{}^\circ \] structure remains intact. done
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C)
\[1{}^\circ \], \[2{}^\circ \] and \[3{}^\circ \]structures of egg are destroyed. done
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D)
A reversible change takes place which can be reversed by decreasing the temperature. done
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question_answer 43)
The letter 'D' in carbohydrates signifies
A)
dextrorotatory done
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B)
configuration done
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C)
diamagnetic nature done
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D)
mode of synthesis. done
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question_answer 44)
The number of amino acids found in proteins that a human body can synthesise is
A)
20 done
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B)
25 done
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C)
10 done
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D)
100 done
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question_answer 45)
A nucleoside on hydrolysis gives
A)
an aldopentose and a nitrogenous base done
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B)
an aldopentose and phosphoric acid done
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C)
an aldopentose, a nitrogenous base and phosphoric acid done
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D)
a nitrogenous base and phosphoric acid. done
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question_answer 46)
Keratin, a structural protein is present in
A)
hair done
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B)
wool done
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C)
silk done
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D)
all of these. done
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question_answer 47)
Glucose can be tested by following
A)
Tollens' reagent done
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B)
Fehling's solution done
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C)
both of these done
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D)
none of these. done
clear
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question_answer 48)
In \[\beta \]-sheet of proteins, conformers are held together by
A)
intermolecular hydrogen bond done
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B)
intramolecular hydrogen bond done
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C)
coordinate bond done
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D)
none of these. done
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question_answer 49)
In an amino acid, the carboxyl group ionizes at \[p{{K}_{{{a}_{1}}}}=2\centerdot 34\] and ammonium ion at \[p{{K}_{{{a}_{2}}}}=9\centerdot 60\]. The isoelectric point of the amino is
A)
\[5\centerdot 97\] done
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B)
\[2\centerdot 34\] done
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C)
\[9\centerdot 60\] done
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D)
\[6\centerdot 97\] done
clear
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question_answer 50)
Which of the following reagents cannot distinguish between glucose and fructose?
A)
Tollens' reagent done
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B)
Fehling's solution done
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C)
Benedict's solution done
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D)
All of these done
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question_answer 51)
Which set of terms correctly identifies the carbohydrate shown? 1. Pentose 2. Hexose 3. Aldose 4. Ketose 5. Pyranose 6. Furanose
A)
1, 3 and 6 done
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B)
1, 3 and 5 done
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C)
2, 3 and 5 done
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D)
2, 3 and 6 done
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question_answer 52)
Match the column I with column II and choose the correct option.
Column - I Column - II [A] Lysine active amino acid (p) Neutral optically [B] Aspartic acid (q) Basic amino acid [C] Valine (r) Neutral optically inactive amino acid [D] Glycine (s) Acidic amino acid
A)
A-s ; B-r ; C-q ; D-p done
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B)
A-r ; B-q ; C-r ; D-p done
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C)
A-p ; B-q : C-r ; D-s done
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D)
A-q ; B-s ; C-p : D-r done
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question_answer 53)
During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process are \[proteins\xrightarrow{enzyme(A)}polypeptides\xrightarrow[a\operatorname{mino}\,acids]{enzyme(B)}\]
A)
invertase and zymase done
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B)
amylase and maltase done
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C)
diastase and lipase done
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D)
pepsin and trypsin. done
clear
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question_answer 54)
Which of the following statements is not correct?
A)
A nucleoside is an N-glycoside of heterocyclic base. done
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B)
Nucleotides are phosphoesters of nucleosides. done
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C)
D)
A nucleotide has the following typical linkage \[-\overset{\begin{smallmatrix} base\\ | \end{smallmatrix}}{\mathop{sugar}}\,-phosphate-\overset{\begin{smallmatrix} base\\ | \end{smallmatrix}}{\mathop{sugar}}\,-phosphate-\] done
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question_answer 55)
A tripeptide (X) on partial hydrolysis gave two dipeptides Cys-Gly and Glu-Cys. Identify the tripeptide.
A)
Glu-Cys-Gly done
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B)
Gly-Glu-Cys done
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C)
Cys-Gly-Glu done
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D)
Cys-Glu-Gly done
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question_answer 56)
Which of the following biomolecules simply refers to as "staff of life"?
A)
Lipids done
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B)
Proteins done
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C)
Vitamins done
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D)
Carbohydrates done
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question_answer 57)
The structural difference in Thymine and Uracil is H of the Uracil is replaced by ______ in Thymine.
A)
\[=O\] done
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B)
\[-C{{H}_{3}}\] done
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C)
\[-N{{H}_{2}}\] done
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D)
\[=NH\] done
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question_answer 58)
The central dogma of molecular genetics states that the genetic information flows from
A)
Amino acids\[\to \] Proteins \[\to \] DNA done
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B)
DNA \[\to \] Carbohydrates \[\to \] Proteins done
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C)
DNA \[\to \] RNA \[\to \] Proteins done
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D)
DNA \[\to \] RNA \[\to \] Carbohydrates done
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question_answer 59)
Which of the statements about "Denaturation" given below are correct? (1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein. (2) Denaturation leads to the conversion of double strand of DNA into single strand. (3) Denaturation affects primary structure which gets distorted.
A)
(2) and (3) done
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B)
(1) and (3) done
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C)
(1) and (2) done
clear
D)
(1), (2) and (3) done
clear
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question_answer 60)
Which of the following groups is simplest form of a carbohydrates?
A)
carboxyl groups done
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B)
Aldehyde and ketone groups done
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C)
Alcohol and carboxyl groups done
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D)
Hydroxyl groups and hydrogen groups done
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