How many chromosomes are in human gametes?
a. 22
b. 23
c. 24
d. 21
Ans: b. 23
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The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered to be an example of artificial selection because
A. humans purposefully raise MRSA in large fermenters in an attempt to make the bacteria ever-more resistant. B. humans are becoming resistant to bacteria by taking methicillin. C. humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin. D. S. aureus is cultivated by humans to replenish the soil with nutrients.
Robert has a tumor on his brain that requires radiation. Before his treatment, doctors perform a CT scan so they can know where to target the beam of radiation. Robert's head is shaved in that area and he receives a tiny circle tattoo to allow the radiation technicians to pinpoint the beam of radiation. What type of therapy is Robert receiving?
A. low-dose internal radiation therapy B. external radiation therapy C. high-dose internal radiation therapy D. interstitial brachytherapy E. chemotherapy
Which one of the following causes the release of epinephrine and norepinephrine from the adrenal medulla?
A) ACTH from the anterior pituitary B) AMTH form the anterior pituitary C) releasing hormone from the hypothalamus D) sympathetic nerves E) parasympathetic nerves
Rabies virus can be directly detected in brain tissue using a(n) ________ assay.
A. viral neutralization B. direct fluorescent antibody C. immunodiffusion precipitation D. viral hemagglutination inhibition E. immunoblot