A plant's response to an external stimulus involves receptors. A receptor that responds to light normally contains

A. an end product of a metabolic pathway.
B. a pigment component.
C. a transduction pathway.
D. a series of relay proteins.


Answer: B

Biology & Microbiology

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Phagocytosis (Phagotrophy) is:

A. attack of cells by bacteriophages B. the phases through which cells pass during division C. the disintegration of a cell D. the attachment of protist cells to a substrate E. the capture of food particles by a cell

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All cells have a plasma membrane, cytoplasm, and ribosomes.

A. True B. False

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Adding phosphorus to an aquatic ecosystem can result in a(n) __________ that clouds water and threatens other

aquatic species. Fill in the blank(s) with the appropriate word(s).

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A college campus — including the students, birds, trees, sidewalks, and air — makes up one complete ________

A) community B) ecosystem C) population D) organism

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