An unrooted tree containing four unrelated species can become rooted by adding ________.
A. an unrelated outgroup
B. a descendant related to only one of the species
C. a distantly related outgroup
D. a descendant group related to two of the species
Answer: C
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Primary productivity is affected by the availability of:
A. sunlight. B. water. C. nutrients. D. sunlight and nutrients. E. sunlight, water, and nutrients.
The energy used to generate most of the ATP
formed in aerobic respiration is released when electrons are passed from NADH to
a. oxygen. b. acetyl-CoA. c. FADH. d. CO2. e. NADPH.
Several tomato plants are growing in a small garden plot. If soil water potential were to drop significantly on a hot, summer afternoon, which of the following would most likely occur?
A) Size of stomatal openings would decrease. B) Transpiration would increase. C) The leaves would become more turgid. D) The uptake of carbon dioxide would be enhanced.
People identified as "universal donors" have (A/B/AB/O) blood type.
Fill in the blank(s) with the appropriate word(s).