An Amoeba,a Protozoan That Moves by Pseudopodia,approaches a Smaller Protozoan

question 24

Multiple Choice

An amoeba,a protozoan that moves by pseudopodia,approaches a smaller protozoan and extends its pseudopodia (extensions of cytoplasm in plasma membrane) around the smaller protozoan.Once the amoeba's pseudopodia completely surrounds the other protozoan,the amoeba's plasma membrane pinches off by folding back into the amoeba and creating a vesicle containing the smaller protozoan.This vesicle is now within the amoeba itself and will soon fuse with other vesicles containing digestive enzymes.This is an example of

• A) pinocytosis.
• B) exocytosis.
• C) osmosis.
• D) phagocytosis.

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Definitions:

Self-discipline

The ability to work systematically and progressively toward a goal until it is achieved.

Extinction

The weakening or decreasing of the frequency of undesirable behavior by removing the reward for such behavior.

Positive Reinforcement

A technique used in behavior psychology to increase the likelihood of a desirable behavior by rewarding it.

Classical Conditioning

A learning process that occurs when two stimuli are repeatedly paired; a response that is at first elicited by the second stimulus is eventually elicited by the first stimulus alone.