The movement of sucrose and H+ into the cell by the same membrane protein reflects the actions of what type of transporter?
A. symporter
B. mechanosensitive channel
C. voltage-gated channel
D. antiporter
E. uniporter
Answer: A
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The principle of ______________ favors the hypothesis that requires the fewest assumptions.
Fill in the blank(s) with the appropriate word(s).
The initiation of transcription in eukaryotes almost always requires activator proteins because:
A. RNA polymerases have little to no intrinsic affinity for promoter sequences. B. RNA polymerases cannot synthesize RNA polymers without association with coactivators. C. promoter sequences are almost always bound by repressor proteins. D. eukaryotic genes exhibit very low gene density.
In replication, once the DNA strands have been separated, reformation of the double helix is preventedby:a
DNA helicase enzyme. b. single-strand binding proteins. c. DNA polymerases. d. ATP. e. GTP.
Which of the following statements accurately reflects the data in Figure 52-3? Say huh?
a. Successful foraging is independent of prey density.
b. Hunting groups of two to three individuals are more effective at low prey densities.
c. Larger hunting groups are more effective at low prey densities.
d. Hunting groups of two to three individuals are more effective at all prey densities.
e. Successful foraging is independent of hunting group size.