Which of the following is not one of the four most abundant elements in the body?
a. carbon
b. hydrogen
c. oxygen
d. nitrogen
e. calcium
E
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Which animal is a chordate?
(a) sea star. (b) sea cucumber. (c) acorn worm. (d) lancelet.
In an antibody-mediated immune response, with which cells do naïve helper T cells interact?
a. antigen presenting B cells b. effector helper T cells c. memory B cells d. antigen presenting dendritic cells e. effector B cells
In some instances, environmental change causes a situation where one phenotype is favored for a period of time and then a different phenotype is favored for a period of time. This oscillating selection is most likely to lead to
A. a population with decreasing levels of genetic variation. B. an increasing population to maintain genetic variation. C. an increase in point mutations. D. the maintenance of genetic variation in the population. E. the elimination of rarer genotypes because of directional selection.
Which of the following nutrients is digested only after it reaches the small intestine?
A) fat B) protein C) starch D) polypeptide