All of the following are components of Darwin's principle of natural selection EXCEPT that
a. new alleles are constantly produced through mutation.
b. populations exhibit great variation.
c. organisms produce more offspring than can be sustained by the environment.
d. over time, adaptive phenotypes increase in frequency within a population.
e. variation can be inherited.
A
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Which of the following is true of both T cells and B cells?
A. They are effector cells against specific pathogens. B. They are produced from stem cells of the bone marrow. C. They can help attack and destroy invading pathogens. D. They typically have a short life span. E. All of these statements are true.
When were African honeybees first found in Texas?
a. 1965 b. 1990 c. 2008 d. 1978 e. 1952
Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
A) N-acetylglucosamine B) peptidoglycan C) lipoteichoic acid D) endotoxin E) mycolic acid
The molecules of the mitochondrial electron transport chain are located:
A) in the stroma. B) in the mitochondrial matrix. C) in the intermembrane space. D) within in the inner membrane. E) in the cytoplasm.