Cell Biology Chapter 18
Which letter is associated with the line that is pointing to the inter polar microtubules in Figure 18-29?
E
Which organelle fragments during mitosis?
Golgi apparatus
Which of the following does not occur during M phase in animal cells?
Growth of the cell.
Which of the following statements is TRUE?
In anaphase B, microtubules associated with the cell cortex shorten.
Which of the following statements about kinetochores is TRUE?
Kinetochores assemble onto chromosomes during late prophase.
Which of the following statements about the cell cycle is FALSE?
Once a cell decides to enter the cell cycle, the time from start to finish is the same in all eukaryotic cells.
Which of the following statements is FALSE?
The activating phosphatase (Cdc25) removes the phosphates from mitotic Cdk that were added by Wee1, so that M-Cdk will be active.
Which of the following statements is FALSE?
The cleavage furrow always forms in the middle of the cell.
Which of the following statements is FALSE?
The loading of the origin recognition complexes (ORCs) is triggered by S-Cdk.
Which of the following events does NOT usually occur during interphase?
The nuclear envelope breaks down.
Which of the following is NOT good direct evidence that the cell-cycle control system is conserved through billions of years of divergent evolution?
Yeast cells have only one Cdk, whereas humans have many Cdks.
Apoptosis differs from necrosis in that necrosis...
causes cells to swell and burst, whereas apoptotic cells shrink and condense.
Levels of Cdk activity change during the cell cycle, in part because...
cyclin activity change during the cycle
Disassembly of the nuclear envelope...
must occur for kinetochore microtubules to form in animal cells.
Sister chromatid separation occurs because ______ are destroyed by the APC/C.
securins
