Which of the following is(are) false regarding
B cells with antigen-MHC complexes?
a. They are stimulated by helper T cells to
secrete cytokines.
b. Helper T cells signal them to divide and
differentiate.
c. On signals from the helper T cells, they
produce clones with identical receptors.
d. Once activated by signals from helper T
cells, they produce IgG, IgA, or IgE
immunoglobulins instead of membranebound
IgM.
e. All of these are true.
A
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Which of the following statements is false?
A. Excretion of urea requires less water than excretion of uric acid. B. Urea is produced in the liver and eliminated in the kidneys. C. Uric acid can be stored at a higher concentration in tissues than urea. D. Ammonia is lethal to cells at high concentrations. E. Excretion of ammonia requires high volumes of water in the surrounding environment.
What is the cell wall's function in the cell?
a. physically protect and support b. identify potentially harmful molecules outside the cell c. prevent water from leaving the cell d. enclose the cell in a polar envelope
The population is in exponential growth at
a. A. b. B. c. C. d. D. e. E.
Carrying capacity is
A) seldom reached by marine producers and consumers because of the vast resources of the ocean. B) the maximum population size that a particular environment can support. C) fixed for most species over most of their range most of the time. D) determined by density and dispersion data. E) the term used to describe the stress a population undergoes due to limited resources