The DNA molecule contains complementary nitrogen bases. There are four bases, bu
ID: 915969 • Letter: T
Question
The DNA molecule contains complementary nitrogen bases. There are four bases, but they pair as A-T and G-C with no cross pairing. How is this accomplished? a. A and G are polar leaning heavily to the positive. T and C are negative. A-G and T-C repel each other and cannot pair. b. A and G do not have their polar sites in the appropriate location to pair, and the same is true of T and C. c. A and T have two matching but opposite polar sites. G and C have 3 polar sites. The two poles will not attract and maintain attraction for three poles. d. there is more than one correct response
Explanation / Answer
The answer is a.
Cross pairing does not occur because the lowest energy state is one that has these H-bonds which means that even though they could pair differently, and would have higher energy (which is less thermodynamically favorable) without the additional H- bonding.
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