Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

16. Cell Division

G1 Phase

Cell Biology

16. Cell Division

G1 Phase

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Multiple Choice

Which of the following is NOT a function of S-Cdks?

Causing the entrance of the cell into S phase

Recruiting DNA helicases

Activating mitogens

Promoting the formation of the replication fork

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Verified step by step guidance

Understand the role of S-Cdks (S-phase Cyclin-dependent kinases) in the cell cycle. S-Cdks are crucial for initiating the S phase, where DNA replication occurs.

Recognize that S-Cdks are involved in the activation of DNA replication machinery. This includes recruiting DNA helicases, which are enzymes that unwind the DNA double helix, allowing replication to proceed.

Identify that S-Cdks promote the formation of the replication fork, a structure that forms at the origin of replication and is essential for DNA synthesis.

Consider the role of mitogens, which are signaling molecules that stimulate cell division by activating pathways that lead to cell cycle progression. Mitogens typically act before the S phase, during the G1 phase, to promote the transition to the S phase.

Conclude that activating mitogens is not a direct function of S-Cdks, as mitogens are involved earlier in the cell cycle to trigger the initial steps leading to S phase entry, rather than being a function of S-Cdks themselves.