The Cell Cycle Can Be Arrested in Mitosis When a Single

question 57

Multiple Choice

The cell cycle can be arrested in mitosis when a single sister-chromatid pair is mono-oriented on the mitotic spindle. If at this point a glass microneedle is used to pull the mono-oriented chromosome toward the pole to which it is not attached, the cell proceeds to anaphase. This observation confirms that …

• A) mono-oriented chromosomes are stable.
• B) mechanical tension drives the formation of bi-oriented chromosomes.
• C) bi-oriented chromosomes activate the spindle assembly checkpoint.
• D) lack of mechanical tension at the kinetochore in at least one chromosome prevents entry into anaphase.
• E) mechanical tension at the kinetochore in at least one chromosome is required for entry into anaphase.

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Definitions:

Smart Board

An interactive whiteboard that integrates touch detection for user input (e.g., scrolling, zooming) with multimedia resources and internet access.

Contingency Theory

The view that learning occurs when stimuli provide information about the likelihood of the occurrence of other stimuli.

Unconditioned Stimulus (UCS)

In classical conditioning, a stimulus that naturally and automatically triggers a response without any prior learning.

Robert Rescorla

An American psychologist known for his work on the involvement of cognitive processes in classical conditioning, especially the contingency theory of learning.