The Lock-And-Key Analogy Is Used to Describe the

question 135

Multiple Choice

The lock-and-key analogy is used to describe the

• A) action of transmitter molecules on receptor proteins.
• B) activation of the nerve impulse.
• C) degradation of transmitter molecules by enzymes.
• D) binding of G proteins to transmitter receptors.

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Definitions:

Radial Symmetry

A body plan in which any section through the mouth and down the length of the body divides the body into similar halves. Jellyfish and other cnidarians have radial symmetry. Compare with bilateral symmetry.

Protostomes

A group within the animal kingdom that includes organisms in which the mouth develops from the primary embryonic opening.

Radial Cleavage

A type of embryonic development in deuterostomes where the planes of cell division are either parallel or perpendicular to the vertical axis of the embryo, resulting in the cells being positioned directly above or beside each other.

Cleavage

Series of mitotic cell divisions, without growth, that converts the zygote to a multicellular blastula.