Communication between cells of the immune system is accomplished in many cases through
A) allelic exclusion.
B) clonal deletion.
C) cytokines.
D) allelic exclusion, clonal deletion, and cytokines.
Answer: C
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The slide coagulase test is a rapid screening test for the production of:
a. clumping factor. b. free coagulase. c. extracellular coagulase. d. catalase.
This is best described as how an animal responds to stimuli in its environment:a
behavior. b. learning. c. proximate causes. d. ultimate causes. e. direct fitness..
Which of the following is/are TRUE of the fertilization envelope?
A. The fertilization envelope is the physical structure responsible for the slow block to polyspermy. B. The fertilization envelope prevents dehydration of the fertilized egg. C. The fertilization envelope arises as a result of the acrosomal reaction. D. The fertilization envelope is the same thing as the jelly layer. E. The fertilization envelope forms when the vitalline layer lifts away from the egg plasma membrane F. None of these are true.
Foreign genes can be inserted into a single plant cell that is then cultured to produce
A) a genetically modified plant. B) genetically modified seeds. C) a new plant species. D) clones of the organisms from which the genes were taken.