An organism acquires a mutation in the gene for pyruvate dehydrogenase that renders the protein unable to bind NADH. What is the most likely consequence of this mutation?
A. Substrate level phosphorylation will cease to occur.
B. Fats will be oxidized at a higher rate than normal.
C. Pyruvate oxidation will cease to occur.
D. ATP synthesis will proceed at a high rate even when the cell has an ample supply.
E. Pyruvate will not be able to enter the mitochondria.
Answer: D
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Alicia is studying for a quiz on the parts of the neuron. She is having trouble remembering that the part(s) of the neuron that receive(s) the incoming message is/are called _____, which are considered part of the postsynaptic side of the neuron.
a. axons b. soma c. dendrites d. ribosomes
Which of the following is a correct statement?
a. Rhodopsin is active in the dark and thereby allows the release of neurotransmitters from the synaptic terminal in the absence of light. b. Rhodopsin is inactive in the dark and thereby inhibits the release of neurotransmitters from the synaptic terminal unless light is present. c. Rhodopsin is active in the dark and thereby inhibits the release of neurotransmitters from the synaptic terminal in the absence of light. d. Rhodopsin is inactive in the dark and thereby allows the release of neurotransmitters from the synaptic terminal unless light is present. e. Rhodopsin's activity is different between rods and cones, but leads always to increasing amounts of neurotransmitters being release.
The chemical __________ enters the mitochondria
to continue respiration. a. phosphoglyceraldehyde (PGAL) b. oxaloacetate c. phosphoglycerate (PGA) d. pyruvate e. citrate
Which of the following is NOT true of the chytrids?
a. They belong to the most ancient lineages of fungi. b. Their flagellum is similar to eukaryotes. c. They form non-flagellated spores and gametes. d. They reflect the origin of the fungi in aquatic habitats. e. They are associated with serious diseases in various vertebrates.