What test result indicates that the unknown can utilize citrate as its sole carbon source?
a. The medium turns pink.
b. The culture becomes turbid.
c. It turns the medium black.
d. The medium turns blue.
Answer: d. The medium turns blue.
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A group of vertebrates that do not have bone are the
A. ray-finned fishes. B. sharks. C. amphibians. D. reptiles.
Many species of snakes lay eggs. However, in the forests of northern Minnesota, where growing seasons are short, only live-bearing snake species are present
This trend toward species that have live birth in a particular environment is an example of _____. A) an exaptation B) sexual selection C) species selection D) goal direction in evolution
A testcross is
A) a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest. B) a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest. C) a mating between two individuals heterozygous for the trait of interest. D) a mating between two individuals of unknown genotype.
Which structure does not represent a mode of vegetative reproduction?
A. stolons B. adventitious plantlets C. runners D. rhizomes E. suckers F. rhizoids