Pyruvate Is the End- Product of Glycolysis

question 7

Multiple Choice

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 B and C

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Definitions:

Direct Materials

The raw materials that are directly traceable to the manufacturing of a product.

Direct Labour

The workforce directly involved in producing goods or delivering services, whose costs are directly attributable to the products or services.

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All manufacturing costs except direct materials and direct labor.