The male gametophyte of a pine tree
a. is produced within a pollen grain.
b. produces sperm.
c. is diploid.
d. is both a and b.
d
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Which of the following types of selection favors the survival of individuals with the intermediate phenotype?
A. Disruptive selection B. Stabilizing selection C. Directional selection
What plants have been significantly altered by humans through artificial selection?
_____ maize. _____ acorns. _____ rice. _____ wheat. _____ Virginia creeper.
The difference between water purification and sewage treatment is
A. the types of microorganisms used for the treatment. B. whether the water source is residential or commercial. C. the amount of air pumped into the water for treatment. D. there is microbial degradation in sewage treatment, but not in water purification.
Answer the following questions true (T) or false (F)
1. Cells harvest energy from nutrients by stripping electrons from them. In other words, the nutrients are oxidized. 2. By the end of the Krebs cycle, every carbon originally in glucose is converted into carbon dioxide. 3. The main energy benefit of the Krebs cycle is the mass production of both ATP and the reduced factors NADH and FADH2.