Which of the following is NOT true concerning sensory neurons?
a. They collect information about stimuli.
b. They lie in the pathway between the interneurons and motor neurons.
c. They relay information to the spinal cord.
d. They relay information to the brain.
e. They are one of three types of neurons.
B
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Detection of the haze produced by some resistant staphylococci and enterococci against methicillin and vancomycin can best be accomplished by:
a. using fluorescent microscopy. b. holding plate in front of reader and using transmitted light. c. holding plate in front of reader and using reflected light. d. placing plate on black background with a light directly above it.
This type of cell has pits and pit plugs
a. xylem b. phloem c. parenchyma d. sclerenchyma e. collenchyma
In an ecosystem’s bottom-up processes, predators affect the abundances of other populations in the ecological
community. ____________________ Indicate whether the statement is true or false.
When the neurotransmitter acetylcholine is applied to skeletal muscle cells, it binds the acetylcholine receptor and causes the muscle cells to contract
Succinylcholine, which is a chemical analog of acetylcholine, binds to the acetylcholine receptor on skeletal muscle cells but causes the muscle cells to relax; it is therefore often used by surgeons as a muscle relaxant. Propose a model for why succinylcholine causes muscle relaxation. What might be the mechanism to explain the different activities of acetylcholine and succinylcholine on the acetylcholine receptor?