In the mitochondrial matrix reactions, the original carbons in pyruvate
A) form glucose.
B) end up in molecules of CO2.
C) form the backbone chain of citric acid.
D) are incorporated into molecules of NADH and FADH2.
E) form the ring structure of oxaloacetic acid.
B
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A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. E. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.
DNA replicates during the ________ phase of the cell cycle.
A) G1 B) G2 C) G3 D) S
The biological species concept emphasizes the ability of individuals to ____
a. adapt to the environment b. have greater longevity c. intermingle with other species d. live in a variety of habitats e. interbreed and produce fertile offspring
The relationship between biomass and primary productivity is that:
a. biomass is the rate of primary productivity b. biomass is the inverse of primary productivity c. biomass is the natural log of primary productivity d. primary productivity is the inverse of biomass e. primary productivity is the rate at which biomass is produced