Which type of microscope is needed to view a virus in the laboratory?

A. Electron
B. Brightfield
C. Fluorescent
D. Compound
E. Darkfield


Ans: A. Electron

Biology & Microbiology

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A protein on a cell surface that binds to a signaling molecule is an example of which of the following elements of cellular communication?

A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices are correct.

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Sex differences in body growth are mediated by changes in growth hormone, insulin-like growth factor I and

A. thyroid hormone. B. estradiol and testosterone. C. prolactin. D. progesterone. E. cortisol.

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Disease-causing microorganisms are called

A. decomposers. B. fermenters. C. pathogens. D. prokaryotes. E. eukaryotes.

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The blood from the digestive tract travels through two different veins before reaching the inferior vena cava.

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

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