What hormone plays a role in the closing of stomata in response to water stress?
A. Auxin
B. Ethylene
C. Abscisic acid
D. Cytokinin
Answer: C
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How is the blood filtered through the glomerulus into the proximal convoluted tubule?
A. Diffusion is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. B. Osmosis is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. C. Blood pressure is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. D. Active transport is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule.
What is allowing new diseases that are driving the Panamanian golden frog (Atelopus sp.) to extinction?
A. deforestation B. new predators C. climate change D. introduced species E. All of the choices are correct
Which of the following describes the sepal of a flower?
a. a modified leaf that encloses the bud b. a long thin structure that links the stigma to the ovary c. a thin stalk that links the anther to the flower’s base d. a sac-like structure at the tip of the stamen
What evidence do we have for the development of photosynthetic cells that used water as an electron
source at least 3 billion years ago?
a. fossils of the first eukaryotic cells b. the discovery of the first plant fossils c. the discovery of stromatolites d. fossils of the first animals e. fossils of the earliest chloroplasts