Use the Following Information to Answer the Next Questions

question 29

Multiple Choice

Use the following information to answer the next questions.
In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate 1) loses a carbon, which is given off as a molecule of CO₂, 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A.
-Why is coenzyme A, a sulfur containing molecule derived from a B vitamin, added?

• A)because sulfur is needed for the molecule to enter the mitochondrion
• B)in order to utilize this portion of a B vitamin which would otherwise be a waste product from another pathway
• C)to provide a relatively unstable molecule whose acetyl portion can readily bind to oxaloacetate
• D)because it drives the reaction that regenerates NAD⁺
• E)in order to remove one molecule of CO₂

---

Definitions:

Parkinson's Law

The adage that "work expands to fill the time available for its completion," suggesting efficiency decreases as the amount of time allocated to a task increases.

Pharmaceutical Industry

The sector of the economy that discovers, develops, produces, and markets drugs or pharmaceutical products for use as medications.

Marginal Cost

The augmentation in complete expenditure resulting from the manufacture of one more unit of a good or service.

Economies Of Scale

The cost advantages that enterprises obtain due to scale of operation, with cost per unit of output generally decreasing with increasing scale.