Multiple Choice
Checkpoints within the cell cycle:
11. Cell Division
Cell Cycle Regulation
Back11. Cell Division
Cell Cycle Regulation
- Multiple Choice
The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________.
a) Telophase.
b) Prophase.
c) G2.
d) Metaphase.
- Multiple Choice
Which of the following cell cycle checkpoints ensures that the genetic material is fully replicated before mitosis?
- Multiple ChoiceTissue culture experiments with PDGF demonstrate that without this substance, __________.
- Multiple ChoiceWhen a cell in S phase is fused with a cell in G1, __________.
- Open QuestionProgression through the cell cycle is regulated by oscillations in theconcentration of which type of molecule?a. p53, Rb, and other tumor suppressorsb. receptor tyrosine kinasesc. cyclinsd. cyclin-dependent kinases
- Open QuestionThe decline of MPF activity at the end of mitosis is due toa. the destruction of the protein kinase Cdk.b. decreased synthesis of Cdk.c. the degradation of cyclin.d. the accumulation of cyclin.
- Open QuestionWhich of the following occurs during apoptosis? (A) lysis of the cell (B) direct contact between signaling cells (C) fragmentation of the DNA (D) release of proteases outside the cell
- Open QuestionApoptosis involves all but which of the following?a. fragmentation of the DNAb. cell-signaling pathwaysc. lysis of the celld. digestion of cellular contents by scavenger cells
- Open QuestionIn the cells of some organisms, mitosis occurs without cytokinesis. This will result ina. cells with more than one nucleus.b. cells that are unusually small.c. cells lacking nuclei.d. cell cycles lacking an S phase.
- Open QuestionCytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere witha. DNA replication.b. formation of the mitotic spindle.c. cleavage.d. formation of the cell plate.
- Open QuestionDiscuss the factors that control the division of eukaryotic cells grown in the laboratory. Cancer cells are easier to grow in the lab than other cells. Why do you suppose this is?