Question

In 1953, Watson and Crick produced a model of the DNA molecule. As per this model, each strand in the molecule of DNA is made up of many small molecules known as (a)_________. There are four types of nitrogenous bases of which (b)__________and (c)_________ are known as purines and cytosine and (d)___________ are known as pyrimidines​

Answer 1

Explanation:

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Answer 2

Answer:

a- nucleotides

b-adenine

c-guanine

d-thymine

Explanation:

A DNA molecule is made up of nucleotides and a nucleotide has nitrogenous base,pentose sugar and phosphate group and in DNA there are two types of nitrogenous bases purines and pyrimidines

purines are same in dna as well as RNA i.e adenine and guanine

whereas, pyrimidines in dna - cytosine and thymine

in RNA - cytosine and uracil