A) have quartenary structure like protein
B) are bonded by disulphide bonds
C) have some polarity
D) are antiparallel
Correct Answer: D
Solution :
In eukaryotic ceils DNA is present in double stranded form. Each strand containing hundreds of thousands to several million nucleotides linked by phosphodiester bonds. The two strands are antiparallel. The strands themselves associated with one another by hydrogen bonds that form between the nucleotides of one strand and complementary nucleoatides of other. A polypeptide acheiving secondary structure folds and leads ro formation of tertiary structure of protein. A polypeptide folds in such a way that adjacent self hydryl group of cysteine residuce are exposed. These free -SH groups can join covalantely to form disulphide bond between the two amino acids. In protein showing quartemary structure each polypeptide called a subunit contains primary, secondary and tertiary structure.
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