Which of the following correctly pairs the particles of an atom with their physical properties?
A. Proton-positively charged; neutron-uncharged; electron-negatively charged
B. Proton-negatively charged; neutron-uncharged; electron-positively charged
C. Proton-positively charged; neutron-negatively charged; electron-uncharged
Answer A
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The SOS regulatory system is activated by
A) the activity of DNA polymerase IV. B) DNA damage. C) transcription of LexA. D) repression of RecA.
If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H+ ions _____
A) is 10 times higher in the cytoplasm than in the mitochondrial matrix B) is 10 times higher in the mitochondrial matrix than in the cytoplasm C) in the cytoplasm is 7/8 the concentration in the mitochondrial matrix D) in the cytoplasm is 8/7 the concentration in the mitochondrial matrix
Which of the following best explains why regulating opening and closing stomata is more difficult in dry and hot environments?
a. Photorespiration becomes a bigger problem as the climate becomes colder. b. Photorespiration becomes a bigger problem as the climate becomes warmer. c. Photorespiration becomes a lesser problem as the climate becomes warmer. d. Photorespiration becomes a lesser problem as the climate becomes colder.
Answer the following questions true (T) or false (F)
1. A small minority of mutations is adaptive, providing an improvement to the gene pool of the population. 2. Genetic drift has a much more significant effect on small populations than on large populations. 3. Without mutation, evolution would eventually cease, because mutations create the variation that evolution acts upon.