In oxidation-reduction reactions, all of the following
are true EXCEPT
a. one molecule gives up electrons.
b. one molecule gains electrons.
c. cells release energy.
d. the molecule that accepts electrons is oxidized.
e. hydrogen ions are usually released.
Answer: d
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The proposed explanation for a phenomenon is BEST described as a(n)
a) observation b) hypothesis c) testable prediction d) experiment e) theory
If a pink snapdragon is self-fertilized, the offspring are red, pink, or white. What type of inheritance pattern does flower color exhibit in this example?
A. codominance B. incomplete dominance C. dominance D. incomplete recessive E. recessive
Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?
A. TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans. B. The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans. C. Viroids are the likely cause of TSEs. D. TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases. E. Infectious TSE preparations do not seem to contain DNA or RNA.
In contrast to ionic bonds, covalent bonds ____
a. hold atoms together b. have distinct, three-dimensional forms c. transfer electrons from one atom to another d. are rarely broken e. are transient