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
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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.
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.
Disease-causing microorganisms are called
A. decomposers. B. fermenters. C. pathogens. D. prokaryotes. E. eukaryotes.
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)