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DNA Repair Enzymes

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Questions and Answers

What happens to a cell that has stopped dividing due to cellular ageing?

Senescence (correct)

Apoptosis

Unregulated cell division

Tumor formation

What is the result of failure to repair extensive DNA damage?

Cell differentiation

DNA replication

Cell division

One of three states: Senescence, Apoptosis or Unregulated cell division (correct)

What is the role of photolyases in DNA repair?

To convert bases back to their original state in the dark

To repair damage caused by exposure to visible light

To repair damage caused by ultraviolet light but only in the absence of oxygen

To reversibly bind and convert lesions back to original bases in the presence of visible light (correct)

What is the outcome of unregulated cell division?

Formation of a malignant tumor Signup and view all the answers

What is necessary for photoreactivation to occur?

Visible light Signup and view all the answers

What is the process by which a cell identifies and repairs DNA damage?

DNA repair Signup and view all the answers

What determines the rate of DNA repair?

Cell type, cell age, and extracellular environment Signup and view all the answers

What is the result of apoptosis?

Cells destroy themselves Signup and view all the answers

What is the only biomolecule that can be repaired?

DNA Signup and view all the answers

What is the term for the process by which DNA damage is directly reversed?

Single-Strand Break Repair Signup and view all the answers

What is the outcome of cellular senescence?

Cells stop dividing Signup and view all the answers