Which compound has the highest free energy and produces the most ATP when oxidized?
A. acetyl CoA
B. glucose
C. pyruvate
D. carbon
E. both pyruvate and carbon
B. glucose
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Which of the following traits of complex multicellular organisms is also shared by some single -celled organisms?
A. adhesion B. plasmodesmata C. gap junctions D. bulk transport E. None of the answer options is correct.
Examples of the mycobacterial species that occur in humans and belong to the Mycobacterium tuberculosis complex include:
a. M. tuberculosis, nontuberculous myco-bacteria, M. bovis, and M. africanum. b. M. tuberculosis, M. gordonae, M. bovis BCG, and M. africanum. c. M. tuberculosis, M. bovis, M. avium, and M. intracellulare. d. M. tuberculosis, M. bovis, M. bovis BCG, and M. africanum.
Answer the following statements true (T) or false (F)
1.A graded potential allows for variable, rather than all-or-none responses, in neurons. 2.During an action potential, sodium ions pour into the cell. 3.The purpose of the nodes of Ranvier is to start nerve impulses. 4.A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential. 5.The reason that we can tell light from sound is because different neurons transmit different stimuli.
Indicate whetherthe statements below are true or false. If a statement is false, explain why it is false
A. Neurotransmitters are small molecules released into the synaptic cleft after the fusion of synaptic vesicles with the presynaptic membrane. B. Action potentials are usually mediated by voltage-gated Ca2+ channels. C. Voltage-gated Na+ channels become automatically inactivated shortly after opening, which ensures that the action potential cannot move backward along the axon. D. Voltage-gated K+ channels also open immediately in response to local depolarization, reducing the magnitude of the action potential.