OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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M-RNA
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T-RNA
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A-DNA
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Z-DNA
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Detailed explanation-1: -7. Which one of the following nucleic acids has a left handed helix? Explanation: Z-DNA is left handed and B-DNA is right handed helix.
Detailed explanation-2: -The A-form RNA double helix can be transformed to a left handed helix, called Z-RNA.
Detailed explanation-3: -Z-DNA (default scene) is a form of DNA that has a different structure from the more common B-DNA form.It is a left-handed double helix wherein the sugar-phosphate backbone has a zigzag pattern due to the alternate stacking of bases in anti-conformation and syn conformation.
Detailed explanation-4: -B-DNA is the term given for the canonical right-handed DNA helix that is the most common form of DNA. Canonical B-DNA is a double helix made of two antiparallel strands that are held together via hydrogen bonding in the A•T and G•C base pairs (fig. 1).