THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrogen containing bases that connect in center by weak hydrogen bonds.
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Nitrogen containing bases that connect in the center by carbohydrate bonds
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Nitrogen containing bases that connect in the center by weak phosphate bonds
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Nitrogen containing bases that connect in the center by strong phosphate bonds
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Detailed explanation-1: -The rungs of the DNA ladder made of four types of nitrogenous bases . These are adenine (A), guanine (G), cytosine (C), and thymine (T). These nitrogen bases pair as A-T and C-G with the help of two and three hydrogen bonds respectively.
Detailed explanation-2: -Other combinations of the atoms form the four bases: thymine (T), adenine (A), cytosine (C), and guanine (G). These bases are the rungs of the DNA ladder.
Detailed explanation-3: -Adenine always joins with thymine and guanine with cytosine. The two strands of DNA run in opposite directions so that they are always complementary to each other. The strands are held together by a hydrogen bond that is present between the two complementary nitrogenous bases.
Detailed explanation-4: -A rung is one of the horizontal steps of a ladder. You should never stand on the very top rung of a ladder-it can be dangerous!
Detailed explanation-5: -In Watson and Crick’s model, the two strands of the DNA double helix are held together by hydrogen bonds between nitrogenous bases on opposite strands. Each pair of bases lies flat, forming a “rung” on the ladder of the DNA molecule.