A CD4+ T cell binds to an antigen only if this antigenis ____
a. in a complex with a class I MHC protein
b. in a complex with a class II MHC protein
c. in a complex with a class III MHC protein
d. not in a complex with MHC proteins
e. presented on the surface of a B cell
ANSWER: b
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Which of the following are present in high densities in both smooth and skeletal muscle cells?
I) cilia II) mitochondria III) nuclei IV) endoplasmic reticulum A) only I and II B) only II and IV C) only III and IV D) only I, II, and III E) I, II, III, and IV
Boyle's law of gas behavior predicts that as the volume of the lungs _____, the pressure of gases within the lungs must ______.
A. increase, decrease B. increase, increase C. decrease, decrease D. increase, not change E. decrease, not change
Rapid communication throughout the body is
accomplished by a. neurons. b. blood. c. hormones. d. muscles. e. connective tissue.
The most complex food webs tend to have many
__________ species. a. producer b. decomposer c. herbivorous d. omnivorous e. consumer