Which animal would you expect to have the most diverse olfactory receptors to enhance their sense of smell?
a. dog
b. monkey
c. human
d. angelfish
e. earthworm
ANSWER: a
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A researcher lacked the necessary equipment to measure methane production so instead monitored CO2 concentration as the unknown archaeon grew and produced methane. Why might CO2 NOT decrease but methane still increase?
A) An alternative carbon source such as methanol was used. B) CO2 is not a carbon source used by methanogens. C) CO2 was used an electron donor but not as a carbon substrate. D) Methanogenic Archaea containing carboxysomes likely made measuring small losses of CO2 difficult to conclude.
After reviewing the graph below, one could state that:
A. grain yield of strain 1 is less dependent than strain 2 on the nitrogen enrichment of the soil. B. at a nitrogen enrichment of 40 kg/hectare, strain 2 provides a higher yield of grain. C. nitrogen enrichment has little effect on grain yield of strain 2. D. strain 1 is the superior choice for grain yield. E. no interaction effect is observed between nitrogen enrichment and grain yield for either strain.
Two-thirds of the available freshwater is
a. used as drinking water for animals. b. used as drinking water for humans. c. used for irrigation. d. wasted.
Imagine that you are observing an enzyme-catalyzed reaction in lab. Every time you add more enzyme, the reaction rate increases proportionally until the reaction rate suddenly levels off. No other chemicals were added, and no modifications were made in the experimental setting. Why do you think the reaction rate stopped increasing?
The molecules of substrate noncompetitively inhibited the enzyme. The molecules of product competitively inhibited the substrate. The molecules of enzyme were used up in the reaction. The molecules of substrate were all bound to enzyme. The enzymes were denatured.