9) A covalent bond is likely to be polar when _____
A) one of the atoms sharing electrons is more electronegative than the other atom
B) the two atoms sharing electrons are equally electronegative
C) carbon is one of the two atoms sharing electrons
D) one of the atoms has absorbed more energy than the other atom
E) the two atoms sharing electrons are the same elements
Answer: A
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Which of these hydrocarbons has a double bond in its structure?
a. C3H8 b. C2H6 c. CH4 d. C2H4 e. C2H2
If temperatures suddenly rise 5 to 10º C, ________ proteins are produced to help stabilize other proteins.
A. heat shock B. photosensitive C. denatured D. chilling E. oxidative
How might a plant cope with the fact that the Calvin cycle uses more ATP than NADPH, yet produces roughly the same amount of both energy intermediates in photosystems I and II?
A. Plants often increase the amount of NADP reductase, thereby increasing NADPH production to match ATP output. B. Increase the electrochemical gradient for H+ across the thylakoid membrane, producing more ATP but not NADPH. C. Photosynthesis can revert from a noncyclic to cyclic electron flow, producing more ATP than NADPH. D. More pigment can be rapidly created for greater photosynthetic capacity, producing equal amounts of ATP and NADPH. E. Electron flow rate can be increased, increasing both ATP and NADPH production.
Radiation works to preserve foods through
A) creation of an anaerobic environment. B) creation of an anaerobic environment and high heat. C) exposure to high heat. D) lethal mutation of bacterial DNA. E) increasing pH.