In conjugation the donor cell is recognized by the presence of
A. an F plasmid.
B. a Y chromosome.
C. diploid chromosomes.
D. an SOS response.
E. an F plasmid AND diploid chromosomes.
A
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FtsZ, MreB, and CreS proteins regulate the shape and structure of bacterial (prokaryotes) cells. These proteins are homologous to what structure in eukaryotes?
A. extracellular matrix B. DNA processing enzymes C. cytoskeleton D. organelles E. cell wall
When did the thinning of the ozone layer over the Arctic become so noticeable that people dubbed it the "ozone hole"? a. Early 1990s b. Early 1960s c. Mid 1980s d. There is no ozone hole about the Arctic
e. Mid 1970s
Maintenance of the resting membrane potential is accomplished by:
a. saltatory conduction down the axon. b. an excess of calcium ions outside the myelin sheath. c. an accumulation of more positive ions outside the neuron than inside. d. the voltage-gated potassium ion channels. e. the storage of acetylcholine in the nerve terminal.
With __________ speciation, populations in physical contact speciate.
Fill in the blank(s) with the appropriate word(s).