Ammonium chloride, a commonly used salt in minimal medium, ____
a. is an organic carbon source
b. provides nitrogen
c. jellifies the medium
d. liquefies the medium
e. sterilizes the medium
ANSWER: b
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When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other, the type of cleavage is called
A. direct cleavage. B. spiral cleavage. C. indirect cleavage. D. protostome cleavage. E. radial cleavage.
Genes in the Hox family of homeobox genes control the body plans of animals along the ____ axis, including where
____ will develop on the animal’s body.
a. dorsal-ventral; appendages b. dorsal-ventral; light-sensing organs c. internal-external; internal organs d. anterior-posterior; appendages e. anterior-posterior; light-sensing organs
Which three factors determine the ecological efficiencies of consumers?
a. assimilation and harvesting efficiencies, and nutrient volume b. assimilation and harvesting efficiencies, and water volume c. production, harvesting, and assimilation efficiencies d. production and harvesting efficiencies, and amount of sunlight e. production and harvesting efficiencies, and percentage of decomposers
Both chromosomes in a pair of _____chromosomes have the same genes.
Fill in the blank(s) with the appropriate word(s).