Which of the following is an example of the second law of thermodynamics?
a. Conversion of the energy in sunlight into glucose
b. The use of gasoline to propel your car
c. ATP activation of a proton pump.
d. A light bulb heats up after use
e. A nuclear reactor lights up the city.
ANSWER: d
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Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
Why is the poly-A tail added to mRNA before it leaves the nucleus?
a. It provides a destination for movement in the cell. b. It protects against exonuclease activity. c. It notifies the cell that this molecule is “self.” d. It provides the final instructions for protein synthesis.
Which subgroup of mammals raises their young in pouches?
A. Cetaceans B. Monotremes C. Marsupials D. Eutherians
How do translation and transcription differ?
1.Translation occurs in the nucleus, while transcription takes place in the cytoplasm. 2.Translation involves mRNA, but transcription does not. 3.Transcription involves a promoter, while translation begins with a start codon. 4.mRNA is produced by transcription, but tRNA is not.