Use the Following Information to Answer the Questions Below

question 5

Multiple Choice

Use the following information to answer the questions below.
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 sulphur-containing molecule derived from a B vitamin, added?

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

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Definitions:

Indifference Curves

A graphical representation used in economics to show different combinations of two goods that give a consumer equal satisfaction and utility.

Utility Maximizes

The behavior of consumers to obtain the greatest satisfaction from their choices, given their resources.

Substitution Effect

The change in demand for a good or service caused by a change in its price, making consumers choose alternatives.

Budget Constraints

The limitations on the spending behavior of consumers based on their income and the prices of goods and services, determining the possible combinations of goods and services they can afford.