Which phylum of vascular, seed-bearing plants has over 260 000 known living species, and is the dominant group of land plants today?
a. Cycadophyta
b. Ginkgophyta
c. Gnetophyta
d. Anthophyta
Ans: d. Anthophyta
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What initiates the sodium-potassium pump?
A. Three sodium ions bind to the cytoplasmic side of the protein. B. Three sodium ions are translocated out of the cell. C. Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind. D. Two potassium ions are transported into the cell. E. ATP binds to the protein which becomes phosphorylated (ADP is released).
Which of the following marks the transition from
glycolysis to the Krebs cycle? a. acetyl-CoA formation b. conversion of PGAL to PGA c. regeneration of reduced NAD+ d. oxidative phosphorylation e. substrate-level phosphorylation
Cell energy can be extracted from which of these?
A. iron B. water C. carbohydrates D. All of these answers are true.
Which of the following does NOT constitute an advantage of using two antibiotics together?
A) It can prevent drug resistance. B) It lessens the toxicity of individual drugs. C) Two are always twice as effective as one. D) It allows treatment to be provided prior to diagnosis. E) All of these are advantages of using two antibiotics together.