The brain maintains information on how things should be operating. This information is based on
a. receptors.
b. integrators.
c. feedback.
d. set points.
e. regulators.
D
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The extra-embryonic membrane that forms the
majority of the placenta is the a. amnion. b. allantois. c. chorion. d. yolk sac. e. umbilical cord.
The term specific activity differs from the term activity in that specific activity:
A) is measured only under optimal conditions. B) is the activity (enzyme units) in a milligram of protein. C) is the activity (enzyme units) of a specific protein. D) refers only to a purified protein. E) refers to proteins other than enzymes.
In the classic experiment that demonstrated the semiconservative nature of DNA replication, cells were grown in 14N and 15N, and DNA was separated by
a. electrophoresis. b. differential centrifugation. c. velocity density-gradient centrifugation. d. equilibrium centrifugation.
Common commercial benefits of microorganisms include synthesis of
A) riboflavin. B) acetone. C) insulin. D) aspirin. E) riboflavin, acetone and insulin.