A rule, natural law, or truth used as a standard to guide conduct is known as a:
A) criterion.
B) code.
C) principle.
D) benchmark.
C) principle.
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How can two cells of a complex multicellular organism have the same genome, but markedly different structures and functions?
A. During differentiation, as cells become specialized, they lose portions of their genome that are no longer needed. B. Different genes are expressed in different cells. C. Part of the process of differentiation of cells involves mutations in the genome. D. Once differentiation begins, the genome no longer controls cellular functions.
The primary source of new red blood cells in mammals is the ____
a. liver b. blood, itself c. spleen d. heart e. bone marrow
Which of the following hormone(s) is/are not synthesized from cholesterol?
a. Testosterone b. Progesterone c. Corticosteroids d. Retinoic acid
UV water treatment systems are effective in treating ________.
A. protozoans B. bacteria C. viruses D. All of these choices are correct.