Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons. These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain. What neurotransmitter is this?
A. Dopamine
B. Acetylcholine
C. GABA
D. Glutamate
E. Serotonin
Answer: A
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Some insecticides, such as chlorpyrifos, work by inhibiting the enzyme acetylcholinesterase (AChE), which normally breaks down the neurotransmitter acetylcholine. Where does this insecticide most likely bind to inhibit the enzyme's activity?
A. The part of an enzyme that combines with acetlycholine B. It does not need to bind with the enzyme directly C. A sequence of DNA nucleotides that encodes the AChE enzyme protein molecule D. Any location on the amino acid chain that forms the AChE enyzme
The vagina has no glands but it is moistened by mucus from glands in the cervical canal
Indicate whether the statement is true or false
Vertebrate striated muscles composed of twitch fibers are able to produce a graded contraction by
A) Recruiting different numbers of motor units. B) Summing EPSPs in the motor end-plate region. C) Having excitatory and inhibitory input to a single muscle. D) Vertebrate muscles are unable to produce graded contractions.
"Hydrophobic exclusion" refers to the chemical interactions that prevent nonpolar molecules from dissolving in water.
Answer the following statement true (T) or false (F)