What is the function of an acrosome?
A) It protects the sperm from vaginal secretions.
B) It contains a haploid nucleus.
C) It holds large numbers of mitochondria.
D) It propels the sperm through the female reproductive tract.
E) It contains enzymes that dissolve the protective layers around the egg.
E
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Activation of the ________ G-protein results in the formation of focal adhesions and stress fibers.
Fill in the blank(s) with the appropriate word(s).
Which soil region extends to the underlying bedrock, and consists of mineral particles and rock fragments but generally no organic material?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon
What term best describes the role of certain metal ions and coenzymes in metabolic processes?
a. reactants b. intermediates c. cofactors d. products e. catalysts
Endocarditis is often a consequence of bacteria attached to the heart valves. These microbes are not eliminated by circulating lymphocytes because
A. lymphocytes do not circulate through the heart valves to detect the presence of microbes. B. Gram-positive microbes don't have an exotoxin surface molecule to trigger an immune response. C. these microbes become covered in platelets and fibrin which is not recognized as foreign by the immune system. D. lymphocytes cannot engulf microbes attached to tissue.