Question

Match the types of nucleic acids given in column I with the items listed in column II.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{P. DNA}& \text{i. Pyridoxine}\\ \text{Q. rRNA}& \text{ii. Clover-leaf-model}\\ \text{R. tRNA}& \text{iii. Double helical model}\\ & \text{iv. Peptidyl transferase}\end{array}$

• A. P - i , Q - ii, R - iii
• B. P - iii, Q - ii, R - i
• C. P - ii, Q - iv, R - i
• D. P - iii Q - iv, R - ii

Answer 1

The correct option is D P - iii Q - iv, R - ii

DNA is the abbreviation for deoxyribonucleic acid. It has a double helical structure where two strands that are antiparallel in nature are held together by hydrogens bonds. One strand runs from 5’ to 3’ while the other strand runs from 3’ to 5’.

rRNA (ribosomal RNA) is a constituent of ribosomes. 23S rRNA in bacteria shows catalytic activity (peptidyl transferase) due to which it is known as the ‘ribozyme’. It is involved in catalysing the formation of peptide bonds between adjacent amino acids during protein synthesis.

tRNA (transfer RNA) helps in protein synthesis by transporting amino acids from the cytoplasm to the ribosome where the formation of polypeptide takes place.

Pyridoxine is a form of vitamin B6.