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sapphireminnow379Lv1

28 Sep 2019

Assume that mammalian cells are synchronized in the G1 phase of the cell cycle and then cultured in the presence of tritiated thymidine for several hours until they enter mitosis.

Will both sister chromatids contain the radioactive label?

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Keith LeannonLv2

28 Sep 2019

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1- Most of a cell's life is spend in this phase of the cell cycle:

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9- The cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.

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3 H thymidine is incorporated into DNA during synthesis. A culture of rapidly growing asynchronous cells is given 3 H thymidine. The cells are then allowed to grow for 1 hour. At the end of the hour, a sample of the culture is fixed and examined by autoradiography. For the purposes of this experiment, consider that the length of G1 is 15 hours, S is 2 hours, G2 is 3 hours, and M is a half hour. Which result would you predict?

a. All of the cells that are in mitosis, but no others, have incorporated the labeled thymidine.

b. All of the cells, both mitotic and nonmitotic , have incorporated the labeled thymidine.

c . None of the mitotic cells, but some of the non-mitotic cells, have incorporated the labeled thymidine.

d. All of the non mitotic cells have incorporated the labeled thymidine

e. None of the non-mitotic cells have incorporated the labeled thymidine.

6.A) If one follows 120 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes would be formed?

B) How many first polar bodies would be formed?

C) How many ootids would be formed?

D) If one follows 120 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would be formed?

E) How many spermatids would be formed?

14. From which phase of the cell cycle does a cell enter G0 phase

21. Which of the following is true about the second meiotic division?

-The products are four identical gametes.

-Homologous chromosomes are pulling apart.

-Nondisjunction would lead to extra bivalents forming.

-Synapsis occurring in the second meiotic division.

-Sister chromatids are pulling apart.

23.Which if the following is true?

-Cells are 4n after S phase.

-Sister chromatids in mitosis are not identical.

-Cells are considered to be 2n after meiosis I.