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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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.
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