When a fist clenches to grasp a pencil, which neurotransmitter is most likely involved?
a. norepinephrine
b. serotonin
c. dopamine
d. acetylcholine
e. glutamate
ANSWER: d
You might also like to view...
You are studying an enzyme-catalyzed reaction that induces a particular cellular activity in the lab. If you wanted to slow down that particular cellular activity by controlling the enzyme, what could you do?
A. Decrease the temperature of the incubator where the cells are growing B. Increase the pH of the media the cells are growing in to the optimum pH C. Add cofactors to the media the cells are growing in D. Add an allosteric activator to the cells
Sometimes a single-stranded molecule of RNA is able to fold back on itself because the nucleotide sequence on one part of the RNA is complementary to another part. This sequence motif results in a:
A. transcription factor binding site. B. hairpin-shaped structure. C. chromosome scaffold. D. negative supercoil. E. positive supercoil.
Which of the following best describes fertilization in the fern life cycle?
a. Pollen is blown by the wind to a female cone, where it forms a pollen tube that grows toward where the egg will form. b. Flagellated sperm swim in a film of water on the surface of the plant to reach an egg. c. Flagellated sperm are blown by the wind to a location near an egg, and then swim through plant fluids to reach the egg. d. Flagellated sperm swim through plant fluids to reach an egg. e. Flagellated sperm attach to the moist skin of certain animals and are transferred to the surface of the plant to reach an egg.
Which ovarian hormone prepares the uterus for a potential pregnancy?
a. GnRH b. estrogen c. progesterone d. FSH e. LH