In amphibians, a pigmented area called the ____ appears after fertilization

a. gray matter
b. gray crescent
c. blastomere
d. cleavage plane
e. gray oocyte


ANSWER: b

Biology & Microbiology

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In order for sperm to mature successfully, the temperature of the testes need to be ____ than normal body temperature

Fill in the blank(s) with the appropriate word(s).

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Sulfur dioxide is added to "must" in the production of wine to

A) improve the flavor. B) allow more control over the fermentation process. C) provide a necessary nutrient for the fermentation process. D) prevent tannins from leaching out of wood into the fermenting wine. E) both enhance flavor and promote fermentation.

Biology & Microbiology

The greatest single cause of blindness in the world is

A) neonatal gonorrheal ophthalmia. B) keratoconjunctivitis. C) trachoma. D) inclusion conjunctivitis. E) pinkeye.

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A dangerous form of food poisoning is caused by

a. Clostridium botulinum. b. Clostridium tetani. c. Bacillus anthracis. d. Heliobacter pylori. e. Thermus aquaticus.

Biology & Microbiology