Why Is the Aplysia Such a Popular Animal for Single-Cell

question 49

Multiple Choice

Why is the Aplysia such a popular animal for single-cell studies of learning?

• A) Individual cells identified in one animal can be recognized in another.
• B) Aplysia have greater learning abilities than other invertebrates.
• C) Aplysia have short-term learning but not long-term learning.
• D) Aplysia have only two neurotransmitters, one excitatory and one inhibitory.

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Definitions:

Decreasing Returns

A principle where an increase in the amount of one factor of production, while other factors are held constant, results in a lower ratio of output per input.

Diminishing Returns

A principle stating that if one factor of production is increased while others are held constant, the incremental output will eventually decrease.

Scale

The size or level of something, often used to describe the scope of a business operation or production.

Increasing Returns

A situation in production where the output increases by a proportion greater than the increase in inputs, often leading to economies of scale.