The central nervous system is covered by
protective membranes called
a. myelin.
b. gray matter.
c. white matter.
d. meninges.
e. neuroglia.
D
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Chloroplasts are thought to have originated as
endosymbiotic associations when aerobic bacteria engulfed photosynthetic cells. This relationship was favored by the production of ____ by the endosymbiont. a. glucose b. hydrogen ions c. ATP d. oxygen e. water
In transduction, two prokaryotic cells of different mating types come together and genetic material is transferred from
one cell to another Indicate whether the statement is true or false.
Most of the carbon dioxide that is made during aerobic respiration is from ________.
A. glycolysis B. the Krebs cycle C. the electron transport chain D. chemiosmosis E. the Calvin cycle
Which of the following can cross the plasma membrane because of its selective permeability?
A. large, nonpolar molecules B. glycoproteins C. gases such as oxygen and carbon dioxide D. large, polar molecules E. ions