CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they _____
A) fix CO2 into organic acids during the night
B) fix CO2 into sugars in the bundle-sheath cells
C) fix CO2 into pyruvate in the mesophyll cells
D) use the enzyme phosphofructokinase, which outcompetes rubisco for CO2
E) use photosystem I and photosystem II at night
Answer: A
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A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. If you wanted to develop a drug to block this pathway, the drug would need to inhibit _____
A. hormone release from the receptor. B. adenylyl cyclase. C. protein phosphatases remove phosphates from proteins initially activated by protein kinase A. D. GTP on the alpha subunit of the G protein being hydrolyzed to GDP. E. phosphodiesterase.
During inhalation, the ____
a. external intercostal muscles relax b. pressure in the lungs is less than atmospheric pressure c. diaphragm moves upward and becomes more curved d. chest cavity volume decreases e. lung pressure increases
What is the correct sequence of organisms if a community is going through secondary succession?a. grasses establish themselves in the communityb. shrubs establish themselves in the communityc. soil formation occursd. trees establish themselves in the community
A. a - b - c - d B. c - a - d - b C. a - c - b - d D. c - a - b - d E. d - c - a - b
If a superbug is resistant to an antibiotic due to horizontal gene transfer, the microbe is said to have
A) natural resistance. B) mutational resistance. C) acquired resistance. D) evolutionary resistance. E) intrinsic resistance.