A pathogen is

a. a disease.
b. an organism that causes a disease.
c. a substance that kills bacteria.
d. the same as a heterocyst.


c

Biology & Microbiology

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A G-protein receptor with GTP bound to it _____

A) is in its active state B) signals a protein to maintain its shape and conformation C) will use cGMP as a second messenger D) directly affects gene expression

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Whether a neurotransmitter is inhibitory or excitatory depends on the type of receptor it binds to on the postsynaptic

neuron.

Indicate whether the statement is true or false.

Biology & Microbiology

The cell wall of plants is composed primarily of cellulose, which is a network of highly branched

____.

a. carbohydrates b. nucleic acids c. proteins d. steroids e. phospholipids

Biology & Microbiology

Which statement is true?

a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.

Biology & Microbiology