Rickettsias differ from chlamydias in that rickettsias

A) are gram-negative.
B) are intracellular parasites.
C) require an arthropod for transmission.
D) form elementary bodies.
E) are enterics.


C

Biology & Microbiology

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The virus repressor protein provides immunity to infection by the same type of virus

Indicate whether the statement is true or false.

Biology & Microbiology

The nutrient canal is indicated by

a. A. b. B. c. C. d. D. e. E.

Biology & Microbiology

Most neurons have formed by the ____, allowing reflexive movements.

A. first trimester B. fourth month C. third trimester D. ninth month E. seventh month

Biology & Microbiology

An antigenic ________ occurs when there is a minor change in antigenicity caused by small mutations in a single influenza virus strain.

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

Biology & Microbiology