Which is true of aminoglycosides?
A. They are bacteriostatic.
B. They irreversibly bind to the 30S ribosomal subunit.
C. They block peptidoglycan synthesis.
D. They are bactericidal.
E. They irreversibly bind to the 30S ribosomal subunit AND they are bactericidal.
E
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Humans are susceptible to scurvy because
A. they cannot synthesize amino acids. B. they do not have enough adipose tissue for vitamin A storage. C. they cannot synthesize vitamin C. D. they have a high incidence of fruit allergies. E. constant seasickness and nausea on long voyages leads to weakness and anemia.
Yeast are ____
a. single-celled fungi b. multicellular plants c. single-celled plants d. single-celled protists e. multicellular fungi
A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This
suggests that the patient has insufficient numbers of
a. macrophages. b. B cells. c. cytotoxic T cells. d. helper T cells. e. NK cells.
Each ommatidium of the compound eye of an insect has a biconvex lens and a ____, which help focus light onto
photoreceptor cells known as ____. a. crystalline cone; retinular cells b. facet; ocelli c. rhabdome; cones d. sclera; rods e. cornea; rhodopsins