At sea level, what is the partial pressure (mm Hg) of oxygen in the air we breathe?
a. 21
b. 50
c. 100
d. 160
e. 540
ANSWER: d
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Which of the following elements can foster the process of crossing over?
A. RNA polymerase B. promoter elements C. enhancer elements D. transposable elements E. topoisomerase
Molecules called uncouplers allow protons to cross the inner mitochondrial membrane, which decreases the proton gradient potential. Consequently, ATP production in the mitochondria would
A. not change, because protons cross the outer mitochondrial membrane to produce ATP. B. increase, because this would spontaneously establish a proton gradient for powering ATP synthase. C. decrease, because the proton gradient, for powering ATP synthase, would dissipate. D. increase, because this would make more oxygen available in the mitochondrial matrix. E. decrease, because electrons would not be able to move through the electron transport chain.
What type of cloning may be used to grow replacement human tissues and organs?
a. Reproductive b. Genetic c. Pharmaceutical d. Prophylactic e. Therapeutic
The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will
A. also break down starch in the stomach, which has a pH of 2. B. be able to break down proteins to amino acids in the stomach. C. be able to break down starch in a test tube. It doesn't need to be in the mouth. D. only work at body temperature.