Pyruvate is the end-product of glycolysis. Many organisms, such as anaerobic bacteria, can only produce energy by glycolysis; therefore, pyruvate has no more potential for ATP generation for these organisms. Rather than simply excrete pyruvate, this molecule is changed to another molecule such as lactate. In these organisms, why is pyruvate changed to lactate and excreted, rather than simply
excreted?
A) Pyruvate export requires more energy than lactate.
B) Electrons (and protons) are added to pyruvate to make lactate.
C) NAD+ is regenerated as pyruvate is changed to lactate.
D) Substrate level phosphorylation changes pyruvate to lactate.
E) both choices B and C
E) both choices B and C
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The ability to alter the connections between neurons is known as:
A. long-term memory. B. synaptic plasticity. C. long-term potentiation. D. All of the answer options are correct.
The insoluble layer of aromatic alcohols that are primarily found in woody tissues are the
A) annulus. B) cadherins. C) proteoglycans. D) lignins. E) pectins.
The role of CAP in the lac operon is:
a. repression of RNA polymerase binding to the promoter. b. negative control of the lac operon. c. enhancement of RNA polymerase binding to the promoter. d. to inactivate the repressor by binding to its allosteric site. e. the activation of allolactose binding to the repressor protein
Which of these can found in oak wood but not in pine wood?
A. tracheids B. vessel members C. ray cells D. secondary xylem E. secondary phloem