Which of the following statements best explains the mechanism for DNA replication?单项选择题

题目图片
A

a. DNA replication is reductive, because half the total DNA present is copied.

B

b. DNA replication is semi-conservative, because each daughter double helix contains half of the parental DNA double helix.

C

c. DNA replication is dispersive, because the two resulting DNA molecules are mixtures of parent and daughter DNA.

D

d. DNA replication is conservative, because one resulting molecule is identical to the original and the other consists of two new strands.

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Individual nucleotides in the nucleoplasm exist as nucleoside triphosphates, meaning they are composed of a nitrogenous base, a sugar, and three phosphates—just like ATP, except that the sugar is deoxyribose.  During DNA synthesis, the exergonic removal of the 2 unstable phosphate ions on the nucleotide drives the polymerization reaction, as the remaining phosphate is joined to the ___ end of the sugar before it.

A model of a process involving nucleic acids is shown in Figure 1. The figure presents a diagram of a replication fork that is growing to the right. Strands that are complementary to the separated template strands on the left side of the fork have already been synthesized. The template strands on the right side remain single stranded. The left end of the upper template strand is labeled 5 prime, and the right end is labeled 3 prime. Two sequential arrows that point from right to left represent the process of strand synthesis with nucleotides that are complementary to the upper template strand. The left end of each arrow is labeled 3 prime, and the right end of each is labeled 5 prime. The left end of the lower template strand is labeled 3 prime, and the right end is labeled 5 prime. A single long arrow that points from left to right represents the process of strand synthesis with nucleotides that are complementary to the lower template strand. The left end of the arrow is labeled 5 prime, and the right end is labeled 3 prime. Figure 1. Model of a process involving nucleic acids Which of the following best explains what process is represented in Figure 1?

Which of the following limitations of DNA polymerase is overcome in the process of lagging strand synthesis?

If the template strand of DNA is of the sequence 5’-AGTTGC-3’, what sequence will DNA polymerase synthesise?

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