Note that they can have more than one answer and I need to provide all the corre

Question

Note that they can have more than one answer and I need to provide all the correct answers.
The concentration of mitotic cyclin: A. rises dramatically during M phase. B. changes as Cdk concentration changes C falls during M phase due to its destruction. is highest in G1 phase. E. determines the timing of mitosis in the cell cycle 14. Disassembly of the nuclear envelope: A. occurs during prophase. B. involves the separation of the inner nuclear membrane from the outer nuclear membrane. C results in the conversion ofthe nuclear envelope into protein-free membrane vesicles. D. is triggered by the phosphorylation of integrins. E must occur in order for kinetochore microtubules to form. 15. The tryptophan (trp) operon of E. coli is repressed by tryptophan added to the growth medium. The tryptophan repressor probably A. binds to RNA polymerase when tryptophan is present. B. binds to the trp operator in the absence of tryptophan. C.) binds to the trp operator in the presence of tryptophan. is a DNA sequence. 16. A mutant yeast strain stops growing and dividing when shifted from 25°C to 37°C. When this strain is analyzed, at either 25°C or 37°C, using a machine that sorts cells according to the amount of DNA they contain, the following graphs are obtained. Which of the following would explain the behavior of your mutant? A. Inability to initiate DNA replication B Defect in chromosome condensation C. Defect in centrosome duplication D. Defect in cytokinesis E. Inappropriate production of a signal that , causes cells to remain in G1. nability to begin M phase amount of DNAbell farbitrary untr) amount of DNAceil Larbitrary unitsl

Explanation / Answer

13.

C. falls during the M phase due to its destruction.

E. determines the timing of mitosis in the cell cycle.

14.

A. occurs during prophase.

E. must occur for kinetochore microtubules to form in animal cells.

15.

C. binds to the trp operator in the presence of tryptophan.

16.

A. inability to initiate DNA replication.

E. inappropriate production of a signal that causes the cells to remain in G1.

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