Helpful bacteria that produce lactic acid would be a defense found in which part of the body?

A) urinary tract
B) skin
C) respiratory tract
D) female reproductive tract
E) stomach


Answer: D

Biology & Microbiology

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While exotoxin production is most generally associated with Gram-positive bacteria, some Gram-negative bacteria also produce exotoxins.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Any substance that is present at the end of a reaction or a pathway is called a(n)

a. reactant. b. end product. c. substrate. d. intermediate. e. chemical.

Biology & Microbiology

Lipid rafts are associated with which of the following activities?

A) responding to extracellular signals B) transport of nutrients across cell membranes C) immune responses D) transport of cholera toxin into cells E) All of the above are correct.

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What will happen to a cell that is placed in a solution containing a high concentration of sugar, a molecule that cannot pass across the cell membrane?

a. The cell will swell up with water and burst. b. The cell will pump the salt in the cytoplasm out of the cell via simple diffusion. c. The cell will lose its interior water, causing it to shrivel up and possibly die.

Biology & Microbiology