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
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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.
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).
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.
The greatest single cause of blindness in the world is
A) neonatal gonorrheal ophthalmia. B) keratoconjunctivitis. C) trachoma. D) inclusion conjunctivitis. E) pinkeye.