6. A researcher observed the shape of the cell\'s surface was irregular, the cel

Question

6. A researcher observed the shape of the cell's surface was irregular, the cells locomotion was limited, and there was no cytokinesis occurring during the cell cycle Which structure is defective? A. Microtubules B. Intermediate filament C. Actin filament D. Keratin 7. Cyclin-Cdk complexes are regulated by? A. Phosphorylation and dephosphorylation B. The rates of cyclin synthesis. C. Proteolysis of the cyclin subunits D. All of the above 8. Progression through the cell cycle is regulated by increase in the concentration of which type of molecule? A. p53, Rb, and other tumor suppressors B. Receptor tyrosine kinases C. Cyclin-dependent kinases D. Cyclins Directions for questions 9-11: Each cell-cycle control system description listed below is most closely associated with one of the following cell-cycle checkpoints. Choose the best answer, A-C. Each of the answer can only be used once! A. Are all chromosomes attached to the spindle? B. Is environment favorable? C. Is all DNA replicated? Is environment favorable? 9. Enter cell cycle and proceed to S phase/ Start transition. 10. Enter mitosis/G2/M transition. 11. Trigger anaphase and proceed to cytokinesis/metaphase-to-anaphase transition. 12. Proteins that are fully translated in the cytosol do not end up in A. B. C. D. The cytosol The mitochondria The interior ofthe nucleus The endoplasmic reticulum

Explanation / Answer

Answer: -

6. The correct option is (A) Microtubules. Microtubules are involved in important functions such as cell motility, cytoskeletal stability, and cytokinesis.

7. The correct option is (D) All of the above.

8. The correct option is (D) Cyclins. Cyclins are among the most important core cell cycle regulators. In order to drive the cell cycle forward, a cyclin activates or inactivates many target proteins inside of the cell such as CDKs.

Answer 9. For this question, the correct option among the three provided is (B) Is environment favorable?

Answer 10. For this question, the correct option among the three provided is (C) Is all DNA replicated? Is environment favorable?

Answer 11. For this question, the correct option among the three provided is (A) Are all chromosomes attached to the spindle?

Answer 12. The correct option is (D) The endoplasmic reticulum. Most proteins destined to enter the endoplasmic reticulum begin to cross the membrane while still being synthesized.

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