If temperatures suddenly rise 5 to 10º C, __________ proteins are produced to help stabilize other proteins.
A. denatured
B. photosensitive
C. chilling
D. heat shock
E. oxidative
D. heat shock
If temperatures suddenly rise, heat shock proteins are transcribed. These proteins help prevent the denaturation of other proteins.
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The Irish potato famine in the mid-1840s was caused by a heterotrophic protist, Phytophthora infestans, which caused widespread infection of potato plants. It was successful in infecting because it was
A. a protozoan, with flagella, and swimming to potato plants in wet seasons, engulfing and digesting the potato cells. B. a red algae, able to perform photosynthesis, allowing its cells to spread from the coast to potato farm fields. C. a water mold, and its soft, fleshy filaments benefitted from several rainy seasons. D. a diatom, with a silica shell allowing it to survive the soil conditions in which potatoes grow as specialized roots. E. a ciliate, which has filaments very similar to water and slime molds.
For living organisms, which of the following is an important consequence of the first law of thermodynamics?
A) The energy content of an organism is constant. B) The organism ultimately must obtain all of the necessary energy for life from its environment. C) The entropy of an organism decreases with time as the organism grows in complexity. D) Organisms grow by converting energy into organic matter. E) Life does not obey the first law of thermodynamics.
Where will RNA polymerase bind to a prokaryotic operon to initiate transcription if a repressor is absent?
a. transcriptional start site b. promoter c. operator d. coding region
The greatest number of ATP molecules is
produced in a. glycolysis. b. alcoholic fermentation. c. anaerobic electron transfer. d. electron transfer phosphorylation. e. the Krebs cycle.