A molecule is
A. a substance that conducts electricity when placed in solution.
B. a positively charged ion.
C. an alteration in the three-dimensional structure of a protein.
D. a combination of atoms held together by chemical bonds.
E. a negatively charged ion.
D
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Tubulin is to microtubules as actin is to
A) ribosomes. B) microfilaments. C) intermediate filaments. D) flagella. E) microvilli.
Which of the following statements correctly describes fatty acids?
A) Volatile fatty acids are the longest fatty acids. B) Saturated fatty acids are linear in structure and have one or no double bonds. C) Medium-chain fatty acids are produced by ruminants when cellulose is fermented. D) Double bonds in fatty acids create bends/kinks in the chain, thus altering membrane structure.
Which part of the vertebrae bears the most weight?
A. lamina B. superior articulating facet C. body D. inferior articulating facet
Approximately what percentage of oxygen is transported in the blood bound to Hb?
a. 1.5 b. 15 c. 60 d. 98.5 e. 100