T cells of the immune system include _____
A) CD4, CD8, and plasma cells
B) cytotoxic and helper cells
C) plasma, antigen-presenting, and memory cells
D) lymphocytes, macrophages, and dendritic cells
E) class I MHC, class II MHC, and memory cells
Answer: B
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Indicate whether the statement is true or false
How fast a population grows depends only on its birth rate
a. true b. false
Why does glucose appear in the urine of a diabetic?
A. The carriers for glucose reabsorption reach their maximum rate of transport. B. The ascending limb of the loop of Henle secretes glucose into the urine. C. No glucose is filtered into the glomerular filtrate. D. The volume of urine is too great to filter. E. The kidneys produce glucose in diabetes.
During periods of rapid environmental change, what can happen to a species that was well suited to the former environment?:
A. The species may go extinct. B. Traits that were favorable in the original environment may be detrimental in the new environment. C. All of the listed responses are correct. D. Individuals with particular traits that provide an advantage in the new environment will have higher reproductive success. E. The population may change so much in adapting to the new environment that it is considered a new species