OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which 2 molecules form the sides (backbone/handrails) of the DNA ladder?
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deoxyribose sugar and adenine
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deoxyribose sugar and a hydrogen bond
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sugar and a nitrogenous base
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deoxyribose sugar and phosphate
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Explanation:
Detailed explanation-1: -DNA consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.
Detailed explanation-2: -Alternating sugar and phosphate units form the two sides of a ladder-shaped arrangement with the rungs or steps each formed by a pair of nucleotide bases.
Detailed explanation-3: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .
Detailed explanation-4: -alternating sugar and phosphate molecules form the sides or “backbone” of the DNA molecule.
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