During production of urine, a major function of the kidney is
A) water conservation.
B) amino acid production.
C) urea conservation.
D) uric acid production.
Answer: A
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Of the following list, which two factors are the main sources of differences among humans? 1. genetic variation 2. behavioral differences 3. differences in metabolism 4. environmental differences
A. 1 & 2 B. 1 & 4 C. 2 & 4 D. 3 & 1
The term "precursor metabolite" refers to molecules that
A. activate cell components. B. are used in biosynthesis. C. result from cell activities. D. are present but inactive.
When one atom loses an electron to another atom, it results in the formation of
A. a polar covalent bond and a new molecule. B. cations and anions that can form ionic bonds. C. a covalent bond between the two. D. many hydrogen bonds. E. a nonpolar covalent bond that is difficult to break.
Enhanced immune responses to subsequent exposures to an antigen to which the body has already been exposed are known as ________ responses.
A. third-degree immune B. allergic C. primary immune D. memory E. autoimmune