chickenjo exam 1

Front

What is the role of cyclin E in the cell cycle?

Back

Cyclin E is crucial for the transition from the G1 phase to the S phase of the cell cycle, where DNA replication occurs.

Front

What happens if the gene for cyclin E is mutated?

Back

If cyclin E is mutated and cannot produce a correctly folded protein, the cell cycle will stop before duplicating chromosomes.

Front

What is hydrogen bonding's role in DNA structure?

Back

Hydrogen bonds between complementary bases hold the two strands of DNA together, stabilizing the double helix structure.

Front

Which DNA sequence would require the least energy to separate during replication?

Back

The sequence TAATCACT would require the least energy due to having fewer hydrogen bonds compared to others.

Front

What percentage of DNA molecules contain atoms from the original DNA after two rounds of replication?

Back

25% of the double-stranded DNA molecules will contain atoms from the original DNA molecule after two rounds of replication.

Front

What is Nucleotide Excision Repair?

Back

Nucleotide Excision Repair is a DNA repair mechanism that removes damaged nucleotides and replaces them with the correct ones.

Front

What is the significance of UV rays in DNA replication?

Back

Excessive UV exposure can cause errors in DNA replication that may not be corrected, leading to mutations.

Front

What is a scientific theory?

Back

A scientific theory is a well-substantiated explanation of an aspect of the natural world, based on a body of evidence.

Front

What is the difference between a hypothesis and a theory?

Back

A hypothesis is a testable prediction, while a theory is a comprehensive explanation supported by extensive evidence.

Front

What is the function of DNA polymerase?

Back

DNA polymerase is an enzyme that synthesizes new DNA strands by adding nucleotides to a growing chain during DNA replication.