Ovulation involves the
a. production of the first polar body.
b. release of a secondary oocyte.
c. beginning of the follicular phase of the
menstrual cycle.
d. suspension of the meiotic process.
e. deterioration of the corpus luteum.
Answer: b
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The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber. B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber. C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber. D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber. E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
Which of the following is not a feature of a seed?
A. It contains a protective coat formed from the outer layers of ovule cells. B. The embryo is surrounded by nutritive tissue or has cotyledons that contain nutritive tissue. C. It contains a large percentage of water to support the embryo. D. It is a complex structure that allows the embryo to be dispersed to distant sites. E. Environmental signals such as light or temperature can trigger germination.
How much plastic enters the ocean each year?
a. 500 million metric tons b. 500 thousand metric tons c. 1 billion metric tons d. 1 million metric tons
Four of the five answers listed below are familiar organelles in the cytoplasm. Select the exception
a. nucleolus b. mitochondria c. ribosome d. Golgi apparatus e. chloroplast