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Molecular Basis Of Inheritance

Question
CBSEENBI12047185

Which of the following be named for DNA produced from RNA?

  • A- DNA

  • B- DNA

  • C- DNA

  • Z- DNA

Solution

C.

C- DNA

The DNA synthesized on template of RNA by the enzyme reverse transcriptase is called complementary DNA (C-DNA).

A-DNA is a right-handed double helix fairly similar to the more common B-DNA form, but with a shorter, more compact helical structure whose base pairs are not perpendicular to the helix-axis as in B-DNA.

 In B-DNA, the most common double helical structure found in nature, the double helix is right-handed with about 10–10.5 base pairs per turn. The double helix structure of DNA contains a major groove and minor groove.

Z- DNA is the double helix that has a left- handed rather than the usual right handed twist and the suagr- phosphate backbone followsa zig-zag course.