The outer part of a G protein receptor binds to a(n) ____, and its inner part binds to a(n) ____
a. G protein; ion channel
b. G protein; tyrosine kinase
c. ion channel; G protein
d. signaling molecule; G protein
e. signaling molecule; tyrosine kinase
d
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In the tropisms with which it is involved, auxin
causes
a. rapid cell division. b. hardening of cell walls. c. cell elongation. d. increased plasma membrane permeability. e. increased protein synthesis
Some of the enzymes stored in peroxisomes are used to break down
A) a cell when it becomes damaged. B) bacteria and viruses. C) faulty proteins produced by the cell. D) the plasma membrane. E) hydrogen peroxide.
In which of its forms do plants generally take up nitrogen for their use?
a. mainly as NH4+ b. mainly as N2 c. mainly as NH3 d. mainly as NO3?
The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. cyanobacteria B. proteobacteria C. spirochaetes D. Staphylococcus E. actinobacteria