Which of the following has the thickest muscle layer?
a. Left ventricle
b. Vena cava
c. Right atrium
d. Capillaries
e. Aorta
Answer: a. Left ventricle
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Consider the following hypothetical situation. Researchers doing influenza surveillance involving molecular analysis of recent isolates of the virus notice a major change in the H and N antigens. What is a likely outcome?
A. The number of cases of influenza will increase significantly. B. The number of cases of influenza will decrease significantly. C. There will be no significant change in the number of cases of influenza.
Subpopulations within a metapopulation are isolated from one another with no movement of individuals between subpopulations
Indicate whether the statement is true or false
Which of these statements is false concerning covalent bonds?
a. Atoms share electrons. b. Molecules may possess many covalent bonds. c. Water contains polar covalent bonds. d. Covalent bonds may be "double bonds." e. In polar covalent bonds, electrons are shared equally.
In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black. Two of the F1 progeny are mated with each other. What proportion of the black F2 progeny is expected to be homozygous?
a. 1/2 b. 1/3 c. 1/4 d. 3/4