A Protozoan Cyst Differs from a Helminth Egg in That

question 34

Multiple Choice

A protozoan cyst differs from a helminth egg in that _______.

• A) a cyst is metabolically active, but an egg is not
• B) the cyst can germinate to form the organism but the egg must be fertilized
• C) cysts have a uniform structure, but eggs have a wide variety of morphologies
• D) the chromosome is free in the cytoplasm of a cyst, but enclosed in a nucleus in an egg

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Definitions:

Scaffold Proteins

Proteins that aid in the assembly of several other protein complexes, acting as a physical support structure for complex formation.

Signals

Means of communication or interaction between cells, organisms, or molecules that trigger responses.

Cyclic AMP

A secondary messenger important in many biological processes, formed from ATP by the action of adenylyl cyclase.

Second Messenger

A substance (e.g., cyclic AMP or calcium ions) that relays a message from a signaling molecule (the first messenger) bound to a cell-surface receptor; leads to some change in the cell.