The ______ is the portion of a neuron most directly responsible for integrating information and triggering action potentials.
A. cell body
B. axon hillock
C. dendrite
D. axon terminal
Ans: B. axon hillock
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Which of the following is true about genes that are located on different chromosomes?
a. These genes are inherited independently of each other. b. Only the dominant alleles of these genes tend to be inherited together. c. These genes are always inherited together. d. These genes are more likely to undergo mutation. e. I don't know the answer.
Terminal electron acceptors used by Desulfotomaculum include sulfate and sulfite, converted to hydrogen sulfide.
Answer the following statement true (T) or false (F)
Hyponatremia is a condition characterized by low sodium in the blood. This is a concern for marathon runners who drink too much water, and can cause life-threatening pressure on the brain. Why would this occur?
A. Neurons would take up the sodium from the blood and not be able to polarize. B. Neurons would be stimulated to all fire at once. C. Neurons would swell by osmosis. D. Neurons die in low levels of sodium. E. Neurons cannot give the kidneys signals to reabsorb sodium ions.
A plant is treated with a chemical that blocks the flow of electrons between photosystem II and photosystem I, such that protons are not transported from the stroma into the thylakoid compartment. What is the effect of this chemical on photosynthesis?
A. a decreased proton gradient will cause less ATP to be produced from the light reactions. B. the increased number of protons will be directly used in the thylakoid to produce glucose. C. an increased proton gradient will provide the energy needed to produce ATP from the light reactions. D. the increased proton gradient will be used to make NADPH for the Calvin cycle.