All of the following are physical barriers to pathogens, except ________.
A. unbroken skin
B. hairs
C. T cells
D. tears
E. mucous
Answer: C
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In the replication of phage containing positive-sense DNA,
A. the host's enzymes are used to make dsDNA. B. the host's DNA polymerase uses the phage RNA as a template to make negative-sense DNA. C. a phage-encoded DNA polymerase is used to make negative-sense RNA using the phage positive-sense RNA as a template. D. a phage-encoded DNA polymerase is used to make DNA using the phage positive-sense RNA as a template.
Where do sperm form?
a. The vas deferens b. The epididymus c. The corpus cavernosum d. The seminiferous tubules
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
Yeast cells undergoing alcoholic fermentation produce
(a) glucose. (b) ethanol. (c) H2O. (d) all of the above.