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Biol 112 - Cell-Cycle Control System Features

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Biol 112 - Cell-Cycle Control System Features

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Questions and Answers

What is one feature that a successful control system of the cell cycle should possess?

Lack of backup mechanisms

A clock/timer to provide a fixed amount of time for each event (correct)

Trigger events randomly

Ability to skip events if needed

Why is having a mechanism to ensure events are only triggered once per cycle important?

To speed up the cell cycle

To allow events to repeat multiple times

To prevent replication errors (correct)

To increase adaptability

What role do checkpoints play in the cell cycle?

To skip DNA replication

To trigger events randomly

To speed up mitosis

To prevent the progression of the next phase if the previous event is incomplete (correct)

Why is adaptability an important feature of the cell-cycle control system?

To modify system behavior based on cell types or environmental conditions Signup and view all the answers

What happens if DNA replication is not complete in the cell cycle?

Sensors send signals to delay the progression of the next phase Signup and view all the answers

Why is having an all-or-none switch that triggers events important in the cell-cycle control system?

It ensures events are triggered in a controlled manner Signup and view all the answers

What happens if chromosomes are not properly attached to the mitotic spindles?

G1 and G2 progressions will be braked Signup and view all the answers

How do checkpoints generally operate?

Via negative signals Signup and view all the answers

Why are negative signals important in the context of chromosome attachment to the mitotic spindle?

Negative signals ensure correct spindle attachment detection Signup and view all the answers

What evidence supports the assertion that cell cycle checkpoints operate through negative signals?

Inactivation or mutation of checkpoints halts cell cycle progression Signup and view all the answers

What controls the activity of Cyclin-dependent Kinases (CDKs) throughout the cell cycle?

Cyclin proteins Signup and view all the answers

Why do cells with defects in checkpoints often accumulate mutations?

As a result of off-chance malfunctions Signup and view all the answers