Vitamin 'C' is a vitamin found in fruits and vegitables. It cannot be stored in our body. why ?

1

(a)

It is soluble in water and hence excess of it readily excreted in urine.

What purine and pyrimidine base are present in DNA and RNA ?

1

(a)

Purines : adenine and guanine : pyrimidines : cytosine and thymine in DNA and  cytosine and uracil in RNA

Name the base which is present in nucleotide of RNA only.

1

(a)

Uracil.

What are type of linkage holds together the monomers of DNA?

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(a)

The monomers of DNA are polydeoxyribonnucleotides. These are held together by H- bonds. There are three H-bonds between guanine and cytosine (G \(\equiv \) C) and two between adenine and thymine (A = T).

Name the three nucleic acids used in protein synthesis.

1

(a)

mRNA, tRNA, rRNA