NEET Zoology Biomolecules Questions Solved


Which is wrong about nucleic acids?                                 [1993]

(a) DNA is single stranded in some viruses

(b) RNA is double stranded occasionally

(c) Length of one helix is 45 Å in B-DNA

(d) One turn of Z-DNA has 12 bases

(c) Length of one helix or the pitch per turn of helix is 34 Å in B-DNA, 25 Å in A-DNA and 46 Å in Z-model of DNA. In Z-DNA sugar molecules are seen in opposite direction. So the 3-5 diester bond forms zig-zag structure in Z-DNA.

Difficulty Level:

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