3.5 Mastery Check

Suppose you have two tissue cultures, one in G1 phase and one in S phase. How would you determine which culture was in G1 and which was in S?

• The G1 phase would have double the amount of DNA.

• The S phase would have double the amount of DNA.

• The G1 phase would have more cytoplasm.

• You can not tell the difference between the G1 and S phase.

What is the purpose of DNA replication in the cell cycle?

• to replace old DNA

• to increase genetic diversity

• to have two copies of each chromosome

• to help the cell grow larger

• to form the spindles

Which enzyme in DNA replication is responsible for ensuring that the new nucleotides are paired correctly?

• DNA helicase

• DNA polymerase

• DNA ligase

• DNA primase

What is the role of DNA ligase in the process of DNA replication?

• It unwinds the DNA double helix

• It adds new nucleotides to the DNA strand

• It joins Okazaki fragments together

• It removes the RNA primer

What is the function of the enzyme DNA helicase during DNA replication?

• It seals the gaps between the Okazaki fragments

• It unwinds the DNA double helix

• It synthesizes the RNA primer

• It adds new nucleotides to the DNA strand

What happens to the DNA molecule during the S phase of the cell cycle?

• The DNA molecule is broken down

• The DNA molecule is replicated

• The DNA molecule is transcribed into RNA

• The DNA molecule is translated into protein