In step 2 of the citric acid cycle, the enzyme aconitase generates isocitrate from citrate. Which of the following statements about this reaction is true?
(a) There is a substantial free-energy difference between the reactants and products of this reaction.
(b) The unbonded electrons from hydroxide ions provide energy for this reaction.
(c) The aconitase enzyme functions as a mutase in this reaction.
(d) The reaction sequence first generates one molecule of water and then consumes one molecule of water.
(d)
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A human cell has a mutation in the gene that encodes the enzyme that generates lactate from pyruvate, rendering that enzyme completely non-functional. Assuming that there is ample glucose present, how would this cell generate energy in the presence of oxygen?
A. Glycolysis coupled with ethanol fermentation B. Aerobic respiration C. Primarily through the break down of proteins into amino acids D. This cell would have no way to generate energy under these conditions because it cannot carry out the reactions needed for glycolysis Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about how cells use multiple fuels to generate energy? How does this relate to the inability of the cell to convert pyruvate into lactate? What other information is related to the question? Choose Answer Do you have all necessary information to determine which products would affect cellular respiration? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The thicker fur that is present in some animals in the population is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Sea stars are not sensitive to desiccation and hence are found in the high intertidal
Indicate whether the statement is true or false
Which of the following organisms feeds on red blood cells?
A) Giardia lamblia B) Escherichia coli C) Taenia spp. D) Vibrio parahaemolyticus E) Entamoeba histolytica