AP Bio Chapter 12 and 13

The leading and the lagging strands differ in that

• the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.
• the lagging strand is synthesized continuously, whereas the leading strand is synthesized in short fragments that are ultimately stitched together.
• the leading strand is synthesized at twice the rate of the lagging strand.
• the leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5' end.

In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?

• A + G = C + T
• A = G
• A + T = G + T
• A = C

Cytosine makes up 40% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?

• 10%
• 40%
• 5%
• 20%

Which enzyme catalyzes the elongation of a DNA strand in the 5' -> 3' direction?

• Primase
• DNA Polymerase III
• Helicase
• DNA ligase

In a nucleosome, the DNA is wrapped around

• satellite DNA.
• ribosomes.
• polymerase molecules.
• histones.

It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in which of the following?

• sequence of bases
• phosphate-sugar backbones
• complementary pairing of bases
• side groups of nitrogenous bases

Tags

NGSS.HS-LS3-1

Nucleotide pairing is always

• purine and purine
• pyrimidine and pyrimidine
• purine and pyrimidine
• none of the above-pairing is random

DNA is replicated using the _______________ model

• conservative
• dispersive
• semiconservative

Enzyme that unwinds the DNA

• ligase
• DNA Polymerase
• primase
• helicase

Seals the Okazaki fragments together

• DNA Polymerase
• ligase
• helicase
• primase