The minimum concentration of antibody produced by
the primary immune response occurs between weeks
a. 2 and 3.
b. 3 and 4.
c. 4 and 5.
d. 6 and 7.
e. 9 and 10.
Answer: c
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Draw a rooted phylogenetic tree containing seven organisms labeled A to G. Label your tree with the following terms: branches, extant taxa, nodes, last common ancestor, and an outgroup
What will be an ideal response?
The innermost portion of a virus's structure is made up of
A. a membranous envelope. B. either DNA or RNA. C. both DNA and RNA. D. microtubules. E. a protein capsid.
Imagine that several atoms bond to form a carbohydrate, creating a more orderly system. Which of the following statements is true regarding the universe after this carbohydrate forms?
a. The energy of the universe increases. b. The energy of the universe decreases. c. The entropy of the universe increases. d. The entropy of the universe decreases. e. Both the energy and entropy of the universe increases.
Helicobacter pylori uses the enzyme urease to counteract a chemical defense in the human organ in which it lives. This chemical defense is
a. lysozyme. b. hydrochloric acid. c. superoxide radicals. d. sebum. e. complement.