Superantigens produce intense immune responses by stimulating lymphocytes to produce

A) endotoxins.
B) exotoxins.
C) cytokines.
D) leukocidins.
E) interferons.


C

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. Insulin's affect on reducing blood glucose levels are counteracted by glucagon's actions, which increase blood glucose. 2. Often one is not acclimated to the cold after having moved from a warm to cooler climate. Similarly, individuals may have difficulty adjusting to the heat after having moved from a cold to warm region. This difficulty in acclimating to different temperatures most likely requires adjustments in thyroid gland activity. 3. Glucocorticoids (i.e., cortisol, prednisolone, dexamethasone) have a diverse number of functions. They include glucose mobilization during stress, development of lung tissue, and therapies to reduce inflammation. 4. Metamorphosis in flatfishes and in amphibians is controlled by growth hormone. 5. It is rare that the nervous system integrates with the endocrine system to control hormone secretion.

Biology & Microbiology

The effect of resource availability on population size

determines a. the carrying capacity of the environment. b. exponential growth. c. the doubling time of a population. d. the population’s biotic potential. e. all of these.

Biology & Microbiology

Suppose a founding population carries an allelic frequency not typical of the original population. Which of the following effects would most likely lead to homogenization?

A) genetic drift within the founding population B) random mating within the founding population C) no mutations within either population D) migration between the original and founding populations E) None of the above.

Biology & Microbiology

The tonicity of a solution refers to its the strength of a solution.

a. true b. false

Biology & Microbiology