18 Questions
What is the average duration of the cell cycle in rapidly dividing human cells?
24 hours
What is the approximate duration of the G1 phase in rapidly dividing human cells?
9 hours
What type of cells can spend their entire lifetime in the G0 phase?
Cortical neurons
What is the approximate duration of the M phase in rapidly dividing human cells?
half an hour
What factors control the timing of events in the cell cycle?
Both internal and external mechanisms
In which type of cells is the cell cycle duration highly variable?
Cells of a single organism
What is the primary function of cyclin-dependent kinases (Cdks) in the cell cycle?
To promote progress to the next phase
During which phase of the cell cycle are the cyclin proteins that were active in the previous stage degraded?
After the cell moves to the next stage
What is the correlation between cyclin accumulation and the three major cell cycle checkpoints?
Direct correlation
What triggers the increase in concentration of cyclin proteins?
Both external and internal signals
What is the purpose of the internally controlled checkpoints in the cell cycle?
To halt the cycle if there is an issue
How many cyclin proteins are involved in the regulation of the cell cycle?
Four
What happens to cell division when there is a lack of human growth hormone?
It is inhibited
Why does a cell divide as it grows in size?
To increase its surface-to-volume ratio
What is the purpose of cell cycle checkpoints?
To ensure proper chromosome duplication and distribution
At which stage of the cell cycle is the integrity of DNA assessed?
G1 checkpoint
What happens when there is too much human growth hormone?
Gigantism
What is the cause of crowding of cells inhibiting cell division?
Increased contact inhibition
This quiz covers the regulation of the cell cycle, including time variation, external events, internal checkpoints, and regulatory molecules.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
