Eukaryotic cells require oxygen to:
A) start glycolysis.
B) perform fermentation.
C) serve as an electron acceptor in the electron transport chain.
D) breathe.
E) enter the Krebs cycle as an intermediate.
Answer: C
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The outside of a neuron is positively charged at resting potential. Why do K+ ions leave the cell when K+ channels open during an action potential?
A. The diffusion gradient is the only factor that affects ion movement. B. K+ ions are actively pumped out by the sodium-potassium pump acting in reverse. C. Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase. The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. D. Negatively charged proteins leave the cell at the onset of the action potential.
Answer the question using the accompanying figure.Which structure vibrates and bends the sensory hairs?
a. 1 b. 2 c. 3 d. 4 e. 5
What are the sporangia of the bread mold Rhizopus?
a) vegetative structures with no role in reproduction b) sexual structures that produce diploid spores c) sexual structures that produce haploid spores d) asexual structures that produce haploid spores e) asexual structures that produce diploid spores
Which of the following must occur in order for a photon to excite an electron in a pigment molecule?
a. The photon must match the energy difference between the ground state and one of the excited states. b. The photon must have lower energy than the electron at the ground state. c. The photon must have lower energy than the energy of the electron at the excited state. d. The photon must have higher energy than the electron at the ground state.