All of the following are physical barriers to pathogens, except ________.

A. unbroken skin
B. hairs
C. T cells
D. tears
E. mucous


Answer: C

Biology & Microbiology

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In the replication of phage containing positive-sense DNA,

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Where do sperm form?

a. The vas deferens b. The epididymus c. The corpus cavernosum d. The seminiferous tubules

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Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from _____

A) applying a molecule of hormone X to the extracellular fluid surrounding the cell B) injecting a molecule of hormone X into the cytoplasm of the cell C) applying a molecule of cAMP to the extracellular fluid surrounding the cell D) injecting a molecule of cAMP into the cytoplasm of the cell E) injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell

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Yeast cells undergoing alcoholic fermentation produce

(a) glucose. (b) ethanol. (c) H2O. (d) all of the above.

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