The outcome of the Gram stain is based on differences in the ________.

A. flagella
B. ribosomes
C. cell wall
D. cell membrane


Answer: C

Biology & Microbiology

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The most common circulating antibody, comprising about 80% of the serum immunoglobin, is

A) IgA. B) IgC. C) IgD. D) IgG.

Biology & Microbiology

Which of the following is a bone of the lower

leg in humans?

a. femur b. fibula c. radius d. ulna e. humerus

Biology & Microbiology

An interaction between two species in which both species benefit is known as ____

a. mutualism b. parasitism c. commensalism d. competition e. predation

Biology & Microbiology

Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. What is the likely outcome of a deletion of the Rag genes?

A. Mild susceptibility to infection due to T cell defects B. Severe combined immunodeficiency (SCID) of both B and T cells C. Increased antibody diversity from B cells D. Increased resistance to infection due to enhanced B and T cell function

Biology & Microbiology