Phagocytosis of microbes by macrophages is enhanced by _____. I) the binding of antibodies to the surface of microbes II) antibody-mediated agglutination of microbes III) the release of cytokines by activated B cells
A) only I and II
B) only II and III
C) only I and III
D) I, II, and, III
A
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Why are flu vaccinations recommended for individuals on a yearly basis?
a. Live viral vaccines revert to disease-causing forms after a year if not replaced. b. The body cannot create new flu antibodies, so they must be replaced yearly. c. Mutations alter viral markers, rendering previous vaccination ineffective. d. Yearly vaccinations allow scientists to track which vaccinations were effective.
In a fetal pig, dorsal and ventral refer respectively to
a. the head and tail regions of the body. b. the tail and the head regions of the body. c. the upper (back) portion and the lower (underside) portion of the body. d. the lower (underside) portion and the upper (back) portion of the body.
When a population goes through a bottleneck, genetic drift occurs in the large population of survivors of a severe
change in environment. ___________ Indicate whether the statement is true or false.
A kilocalorie is defined as
A) the quantity of glucose needed to increase the body temperature by 1°C. B) the quantity of heat needed to raise the temperature of 1 kg of water by 1°C. C) the quantity of food used to maintain normal bodily functions. D) the quantity of food consumed during a given type of exercise.