Question 1 Movement of the chromosomes during anaphase of mitosis would be most

Question

Question 1

Movement of the chromosomes during anaphase of mitosis would be most affected by a drug that

a. reduces cyclin concentrations.

b. blocks astral microtubule formation.

c. prevents kinesin movement along microtubules.

d. prevents depolymerization of microtubules.

e. prevents attachment of the microtubules to the centromeres.

Question 2

At various times, DNA was isolated from the nuclei of cells growing in cell culture. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?

a. G?

b. end of G

c. beginning of S

d. end of G?

e. end of M

Question 3

Sort the following schematic diagrams (1-5) to reflect the order of events in a typical eukaryotic M phase. An interphase cell in G2 phase is drawn on the left for comparison.

a. 12345

b. 54321

c. 13452

d. 24531

e. 25431

Question 4

Which of the following is not true about Wee 1 but is true about Cdc25?

a. it is a protein kinase.

b. it is activated by phosphorylation.

c. it is influenced by the activated M/Cdk complex.

d. it puts an inhibitory phosphate on the M/Cdk complex.

e. it is degraded by S-cyclin.

Question 5

Consider the cell pictured below at the beginning of anaphase. The microtubules have been stained with a fluorescent dye to make them green. Then, the areas outlined by the boxes were bleached to remove the dye from those areas, leaving the microtubules intact. (Imagine those areas inside the boxes as not having the green dye.) As anaphase progresses, what will happen to the bleached areas of the microtubules labeled A and B?

a. The bleached area on microtubule A will move to the left and the bleached area on microtubule B will move to the right.

b. The bleached areas will both move toward the center.

c. The bleached areas will slowly become fluorescent again.

d. The bleached areas will disappear as the microtubules overlap.

e. Neither bleached area will move.

Question 6

If a cell has completed the first division of meiosis (meiosis I), which of the following is true?   

a. It has half the amount of DNA as the cell that began meiosis I (the originating cell).

b. It has half the number of chromosomes but double the amount of DNA of the originating cell.

c. It has half the amount of DNA but double the number of chromosomes as the originating cell.

d. It is identical to the originating cell.

e. It is diploid.

a. reduces cyclin concentrations.

b. blocks astral microtubule formation.

c. prevents kinesin movement along microtubules.

d. prevents depolymerization of microtubules.

e. prevents attachment of the microtubules to the centromeres.

Question 1 Movement of the chromosomes during anaphase of mitosis would be most affected by a drug that Question 2 At various times, DNA was isolated from the nuclei of cells growing in cell culture. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA? Question 3 Sort the following schematic diagrams (1-5) to reflect the order of events in a typical eukaryotic M phase. An interphase cell in G2 phase is drawn on the left for comparison. Question 4 Which of the following is not true about Wee 1 but is true about Cdc25? Question 5 Consider the cell pictured below at the beginning of anaphase. The microtubules have been stained with a fluorescent dye to make them green. Then, the areas outlined by the boxes were bleached to remove the dye from those areas, leaving the microtubules intact. (Imagine those areas inside the boxes as not having the green dye.) As anaphase progresses, what will happen to the bleached areas of the microtubules labeled A and B? Question 6 If a cell has completed the first division of meiosis (meiosis I), which of the following is true?

Explanation / Answer

1.e

2. a G2 phase

3. CANNOT SEE THE PICTURE

4. b

5. WHERE IS THE PICTURE

6.a

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