Mycoplasmas are pleomorphic because they
A. have no cell walls.
B. are low G + C content Gram-positive bacteria.
C. exhibit snapping division.
D. have sterols in their cytoplasmic membranes.
E. produce endospores.
Answer: A
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The midgut (select all correct choices):
A. includes the small intestine. B. includes the large intestine. C. is where most nutrient absorption occurs. D. is where the highest concentration of amylase would be found. E. is where glucose is allowed to passively diffuse into cells.
When rhizobia approach a plant root, the plant initially responds by
A. releasing flavonoid inducer molecules. B. an increase in exudate. C. an oxidative burst. D. producing leghemoglobin.
What do the two sets of neurons damaged in Charcot-Marie-Tooth neuropathy comprise?
Charcot-Marie-Tooth is the most commonly inherited peripheral neuropathy, and has no known cure. Patients suffer damage to motor and sensory neurons, leading to degeneration of muscles and gradual loss of motor control. A. peripheral nervous system B. autonomic nervous system C. somatic nervous system D. parasympathetic nervous system E. central nervous system
Nicotine from cigarette smoke acts as a ligand and associates with specific cells in the nervous system. Nicotine eventually produces feelings of pleasure and well-being. Below are the events that happen in the cellular response to nicotine. Place the events in the correct order to describe the steps in the signaling pathway.
A. The acetylcholine receptor is an ion channel, and, when a ligand binds, the ion channel opens. B. An influx of ions carries the signal to the reward areas of the brain. C. Nicotine binds to the transmembrane protein that normally binds the neurotransmitter acetylcholine. D. The signal causes release of dopamine in the brain, which causes good feelings. E. Nicotine is quickly eliminated from the body (causing cravings for more cigarettes to produce good feelings). a. Nicotine is quickly eliminated from the body (causing cravings for more cigarettes to produce good feelings). b. A, D, B, C, E c. B, A, C, D, E d. C, A, B, D, E e. C, D, B, A, E