The majority of mammal species living today are ____, or placental mammals, including such diverse
groups as rodents, bats, whales, and primates.
a. protherians
b. therapsids
c. anthropoids
d. eutherians
e. metatherians
D
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Imagine that you have set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan for energy. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that _____.
A) cannot grow on either type of media B) can grow on both types of media C) can grow only on the plates with tryptophan D) can grow only on the plates with glucose
Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
The “back” of the human body is its __________
surface. a. anterior b. posterior c. inferior d. superior e. ventral
The neuron that releases neurotransmitters is known as ________, while the neuron that receives the neurotransmitters is knows as ________
Fill in the blank(s) with correct word