BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The Adenine-Thymine base pair is held together by 2 hydrogen bonds while the Guanine-Cytosine base pair is held together by 3 hydrogen bonds. That is also the reason why the two strands of a DNA molecule can be separated more easily at sections that are densely populated by A-T base pairs.

Detailed explanation-2: -Answer and Explanation: The number of specific bases is determined by the number of hydrogen bonds each base pair can make. Adenine pairs with thymine in DNA or uracil in RNA. Adenine creates two hydrogen bones with either thymine or uracil because it has two nitrogen atoms in its ring that can form hydrogen bonds.

Detailed explanation-3: -Adenine and thymine together form a double hydrogen bond, while cytosine and guanine form a triple hydrogen bond.

Detailed explanation-4: -The base pairs are stabilized by hydrogen bonds; adenine and thymine form two hydrogen bonds between them, whereas cytosine and guanine form three hydrogen bonds between them. Figure 22.2.