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

Biology & Microbiology

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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.

Biology & Microbiology

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.

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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

Biology & Microbiology

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

Biology & Microbiology