Which of the following neurotransmitters elicits the fight-flight response?
a. acetylcholine
b. serotonin
c. dopamine
d. norepinephrine
e. nitric oxide
D
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The behavior of parental care exhibited by dinosaurs is thought to be __________ to this behavior in crocodiles and birds because phylogeny shows that these three groups share a common ancestor.
Fill in the blank(s) with the appropriate word(s).
The suborder Anthropoidea includes:a
monkeys, apes, and humans. b. humans only. c. apes and monkeys only. d. lemurs, galagos, and lorises. e. monkeys and lemurs.
What is the function of troponin and tropomyosin during skeletal muscle contraction?
A) To generate an action potential B) To regulate bonding between actin and myosin C) To remove calcium from the muscle fiber D) To increase the amount of calcium entering the muscle fiber E) To prevent over-contraction of muscle fibers
In a small rodent species the C^B C^B codes for black fur, the genotype C^W C^W codes for white fur, and the genotype C^B C^W codes for gray fur. This is an example of ____________.
a. pleiotropy b. codominance c. incomplete dominance d. a sex-linked trait