The function of valves in the heart is to
a. form blood cells.
b. participate in immunity.
c. prevent backflow of blood.
d. prevent clot formation.
e. push blood ahead.
C
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If you were to replace the phosphate group of a phospholipid with a fatty acid chain, you would have
A. glycerol. B. a triglyceride. C. cholesterol. D. glycolipid.
The elongation of stems is stimulated by
A. ethylene only. B. gibberellin only. C. auxin and gibberellin. D. auxin only. E. auxin and ethylene.
How does transcription of sporulation genes in B. subtilis involve different sigma factors?
What will be an ideal response?
The long and complex series of events that occurs when a signal binds to the cell surface and is converted from one form to another is called _____.
-signal transduction -transesterification reaction -action potential -signal cross-wiring