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Cell Cycle and DNA Replication

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Questions and Answers

During which phase of the cell cycle does DNA replication occur?

Mitotic phase

G1 phase

G2 phase

S phase (correct)

What is the result of DNA replication during the S phase?

Conversion of tetraploid genome to diploid genome

Conversion of diploid genome to tetraploid genome (correct)

No change in genome content

Conversion of haploid genome to diploid genome

What is the function of methylation of DNA?

To slow down DNA replication

To inhibit DNA replication (correct)

To accelerate DNA replication

To initiate DNA replication

What is the characteristic of the G2 phase?

Enlargement of cytoplasm Signup and view all the answers

What is the role of cyclins in the cell cycle?

To regulate the transition of one phase to another Signup and view all the answers

What is the number of DNA polymerases involved in DNA synthesis?

500-1,000 Signup and view all the answers

What happens to cyclin D levels in late G1 phase?

They rise Signup and view all the answers

What is the main problem in replicating linear DNAs in eukaryotic cells?

The lagging strand cannot be completely synthesized Signup and view all the answers

What is the role of telomeres in eukaryotic chromosomes?

To prevent DNA loss during replication Signup and view all the answers

What is the composition of telomerase?

Both protein and RNA Signup and view all the answers

What is the function of the telomerase RNA sequence?

To serve as a template for telomere extension Signup and view all the answers

What is the end result of telomere shortening in eukaryotic cells?

The cell dies due to loss of essential genes Signup and view all the answers