GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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individual nitrogenous bases
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alternating bases and sugars
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alternating bases and phosphate groups
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alternating sugars and phosphates
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Detailed explanation-1: -DNA is also called a three-dimensional double helix. It looks much like a twisted ladder, and the backbone of the ladder is made of sugar phosphates. The sugar in DNA–deoxyribose–is where the name deoxyribonucleic acid comes from.
Detailed explanation-2: -They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder. The rungs of the ladder are formed by complementary pairs of nitrogen bases-A always paired with T and G always paired with C.
Detailed explanation-3: -Double helix, as related to genomics, is a term used to describe the physical structure of DNA. A DNA molecule is made up of two linked strands that wind around each other to resemble a twisted ladder in a helix-like shape.
Detailed explanation-4: -It twists in response to bonding between two strands. This occurs as a result of DNA’s spatial requirement. The protein histones that allow it to coil and supercoil. The AT bond has two hydrogen bonds, whereas the GC bond has three hydrogen bonds.
Detailed explanation-5: -Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing. These hydrogen bonds are individually weak but collectively quite strong.