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AP Cell Cycle and Genetics Test Corrections
7. D
B
Golgi-derived vesicles are primary responsible for the cytokinesis in plant cells but not in animal cells because the Golgi-derived vesicles are only present in the plant cell. 8. C
D
Preventing the shortening of the microtubules will cause the movement of the chromosomes during the anaphase because anaphase involves the separation of the sister chromatids at the centromeres via the shortening of the spindle fibers. 9. B

D
During the S phase the cell is replicating an therefore the number of the picograms is doubled. During the G2 phase only the size of the cell increases but not the actual number of the picograms. 10. B

D
THe chromosomes are "reeled in" by the shortening of spindle microtubules, and motor proteins of the kinetochores move by chromosomes along the spindle microtubules. 12. D
A
PDGF is released by platelets in the vicinity of an injury because PDGF is a platelet derived growth factor 13. E
D
Cyclin is a protein synthesized at specific times during the cell cycle that associates with a kinase to from a catholically active complex because cyclin combines tot eh kinase to combine to the cdk. 14. C

E
CDK is the protein maintained at a constant levels throughout the cell cycle that requires cyclin to become catholically active. 15. E
B
The MPF tigers the cell's passage past the G2 checkpoint into mitosis because it recognizes it and the it either allows it to leave the G2 checkpoint or it sends it to the G0 checkpoint, 16. A
B
As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing. That is what the density-dependent inhibition is explained. 17. B
C
Besides the ability of some cancer cells to over proliferate, there also could be a lack of the appropriate cell death in the tumor which would not cause the cells to divide unstopidly and therefore the cancer will not occur. 19. D

B
IN the sexual reproduction the cells transmit 50% of their genes each of their offspring so therefore each offspring has 50% of the genes from both parents. 20. C
B
During the metaphase the chromosomes are being photographed in the preparation of the karyotype during the stage of the mitosis. And then the centrioles separate and the nucleus divides and therefore the homologous pairs separate and the cell is divided. 23. A

E
If the organism has 46 chromosomes in its karyotype, then its gametes must have 23 chromosomes, because each karyotype has 2 chromosomes because the ratio of the chromosomes in the karyotype to the gamete is 2 to1. 24. E

A
The synaptonemal complex disappears during the late prophase of the meiosis I. I thought that it happens during the early anaphase of the meiosis I. 25. D
A
As the conclusion of the meiosis I the homologous chromosomes are separated and therefore 2 new cells are formed. 27. A
B
The homologous chromosomes are aligned at the equator of the spindle during the metaphase. I thought that it happens during the prophase. 28. E
A
Synaptonemal complexes form or are still present during the prophase. I switched the prophase and the metaphase that is why I put the wrong answer for both of the questions. 29. C
E
Centromeres of the sister chromatids disjoin and chromatids separate during the anaphase II and then the cytokinesis occurs and the fore then 2 new cells are formed. 30. D
A
Diagram number I represents the anaphase I because it shows 2 sister chromatids separate 31. E
D
During the anaphase II only 2 sister chromatids are separating and therefore it shows on the diagram V 32. C
D
The answer will be that 1 chromosome 12 with one blue gene and one chromosome 19 with one long gene because each gene is going to have 50% of the information from the parent genes. 34. B
D
The DNA content during the meiosis of the cell is going...
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