question_answer 21)

  Chromosomes are made up of (a) DNA                                (b) Protein                          (c) DNA and protein        (d) RNA

Answer:

  (c) Chromosomes are thread-like structures usually present in the nucleus which becomes visible only during cell division. Each chromosome is made up of two components (i) Deoxyribonucleic acid (DNA) (ii) Proteins (e.g.; his tones and acidic proteins) These consist of two (unreplicated) or four (duplicated) arms and a primary constriction or centromere which gives them a particular shape due to its position. The paired condition of chromosome is called diploid and unpaired chromosome are said to be haploid.