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