If you were to add one of the eight citric acid cycle intermediates to the culture medium of yeast growing in the laboratory, what do you think would happen to the rates of ATP and carbon dioxide production?
A) There would be no change in ATP production, but we would observe an increased rate of carbon dioxide production.
B) The rates of ATP production and carbon dioxide production would both increase.
C) The rate of ATP production would decrease, but the rate of carbon dioxide production would increase.
D) Rates of ATP and carbon dioxide production would probably both decrease.
B
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In a single polymerase chain reaction (PCR) cycle consisting of 15 seconds at 94 °C, 30 seconds at 50 °C, and 1 minute at 72 °C, what is happening in the step run at 50 °C?
A) The DNA to be amplified is being denatured. B) Primers are being denatured. C) DNA polymerase is extending new DNA from the primers. D) Primers are annealing to the DNA to be amplified. E) DNA polymerase is being inactivated.
Electrical signals are converted into chemical signals at the end of a(n) _____
a. neuroglial cell b. muscle cell c. microvillus d. neuron cell body e. axon
In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This is an example of
A. disruptive selection. B. balancing selection. C. directional selection. D. negative frequency-dependent selection.
How does DNA differ from RNA?
A. RNA uses only purines B. RNA uses a different five-carbon sugar C. RNA has a contains different sized phosphate groups D. RNA has multiple bases attached to the sugar