Gene regulation can involve a protein repressor that blocks ________ from initiating transcription.
A. rRNA
B. RNA polymerase
C. DNA polymerase III
D. DNA polymerase I
E. mRNA
Answer: B
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Which of the following is NOT a part of the MAP kinase pathway? (Select all correct choices.)
A. A receptor kinase is activated by binding to a growth factor and phosphorylates receptor cytoplasmic domains. B. The activated receptor kinase dimer activates the RAS protein to bind to a GTP. C. The activated RAS protein activates protein kinases in the signal-transduction pathway. D. A series of protein kinases amplify the signal to the nucleus where genes responsible for cell division are switched on. E. A pyrophosphatase enzyme terminates the cellular response.
American sycamore(Platanus occidentalis) and European sycamore (Platanus orientalis) are tree species that will interbreed if planted nearby but will not normally interbreed because they occur on different continents. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
Glacier ice
What will be an ideal response?
The tension-length curve for a muscle fiber is the same as that for a muscle
a. true b. false