A fetus is
(a) a newborn pig.
(b) a newborn human.
(c) an unborn mammal.
(d) all of the above.
(c) an unborn mammal.
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A cell's DNA molecules contain its genetic material. DNA molecules contain patterns for the production of
a. proteins. b. amino acids. c. phosphates and sugars. d. four kinds of bases. e. proteins, amino acids, phosphates, sugars, and four kinds of bases.
Immunological memory accounts for _____
A) the human body's ability to distinguish self from non-self B) the observation that some strains of the pathogen that causes dengue fever cause more severe disease than others C) the ability of a helper T cell to signal B cells via cytokines D) the ancient observation that someone who had recovered from the plague could safely care for those newly diseased
When substrate-level phosphorylation occurs, it means that:
A. NAD+ is converted into NADH. B. ADP is converted into ATP by the addition of a phosphate group. C. ATP is converted into ADP plus a phosphate group. D. NADH is converted into NAD+ plus a proton.
Which of the following pairs of structure are homologous?
A. wing of a dragonfly and wing of a hawk. B. wing of a dragonfly and forelimb of a flying squirrel. C. pectoral fin of a shark and front flipper of porpoise. D. forelimb of a dog and forelimb of a horse. E. wing of a bluejay and front flipper of a porpoise.