Activated complement brings about the death of a microbe when it ________
a. mediates interactions between immune cells only
b. activates a chemotaxic response in certain phagocytic cells only
c. all of the choices
d. organizes into a membrane pore and causes lysis of the cell only
c
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Which of the following represents the activation energy needed for the enzyme-catalyzed reverse reaction, C + D ? A + B, in the figure?
A) a B) b C) c D) d E) e
In most human populations, lactase levels are highest soon after birth and drop off in middle-to-late childhood
a. True b. False
________ pump protons to keep the internal proton concentration of lysosomes high
Fill in the blank with correct word.
Integrins are unusual in that they:a
are steroids. b. are specific transmembrane proteins. c. respond to information received from inside and outside the cell. d. stimulate both the Ras pathway as well as the IP3 pathway. e. are found only in Arabidopsis thaliana.