The residence time is equal to the pool size divided by the flux between pools. The pool size of atmospheric carbon (carbon dioxide, methane, etc) is ~750 Pg, and the movement of carbon into the atmosphere from burning fossil fuels is around 7.5 Pg/year. How long does carbon from burning fossil fuels remain in the atmosphere on average?
A) 7.5 years
B) 10 years
C) 100 years
D) 750 years
E) There's not enough information to answer
Ans: C) 100 years
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Bacteriophage have a ________ complex structure than animal viruses, because ________
A) more / bacteriophages must be coated by lipopolysaccharide to attach to bacterial cells B) less / the bacteriophage does not have to penetrate the nucleus C) more / the bacteriophage must penetrate the peptidoglycan cell wall D) less / there prokaryotic cells have a simple structure compared to eukaryotic cells
Plants cannot enable and improve access to particular nutrients by
a. releasing amino acids into the soil. b. releasing carbohydrates into the soil. c. releasing enzymes into the soil. d. releasing organic substances into the soil. e. releasing carbon dioxide into the soil.
Which description would be considered a scientific theory like the theory of evolution?
A) a theory about why an apple falls to the ground when dropped B) a theory about why your neighbor has the nicest car in the neighborhood C) a theory about which of your classmates is the source of your cold D) a theory about why blue is your favorite color
Although poliovirus capsids contain several distinct proteins, these are synthesized as a single polypeptide then cleaved by proteases to produce the individual proteins.
Answer the following statement true (T) or false (F)