During ventricular systole (contraction):
a. the ventricles relax.
b. blood flows from the ventricles into the atria.
c. the tricuspid and mitral valves are open.
d. blood flows from the ventricles to the pulmonary artery and aorta.
e. the atria contract.
d
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The accepted method of testing water supplies for the possible presence of pathogens is to determine the presence of
A. Streptococci. B. coliforms. C. Staphylococci. D. Streptomyces.
Darwin obtained which of the following in the Essay on the principle of Population by Malthus?
A. Organisms are varied and some variations are inherited. B. Populations grow constantly. C. An individual's chance of survival is random. D. Species do not change over time. E. More individuals of a population are born than survive to reproduce.
Which one of the following molecules is able to move across the cell membrane by simple diffusion?
A. DNA B. hemoglobin C. carbon dioxide D. starch E. glucose
The _______________ is the study of what happens to all the alleles in a population
A. Macroevolution B. Microevolution C. Adaption D. Population genetics