Some Friends Are Trying to Make Wine in Their Basement

question 44

Multiple Choice

Some friends are trying to make wine in their basement.They've added yeast to a sweet grape juice mixture and have allowed the yeast to grow.After several days they find that sugar levels in the grape juice have dropped,but there's no alcohol in the mixture.The most likely explanation is that

• A)the mixture needs more sugar,because yeast need a lot of energy before they can begin to produce alcohol.
• B)the mixture needs more oxygen,because yeast need oxygen to break down sugar and get enough energy to produce alcohol.
• C)the mixture needs less oxygen,because yeast only produce alcohol in the absence of oxygen.
• D)the yeast used the alcohol as a carbon source.

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Definitions:

Peptide Structure

The specific arrangement of amino acids, linked by peptide bonds, which determines the composition and characteristics of a peptide.

Dipeptide

A molecule composed of two amino acids linked by a peptide bond.

Ala-Ser

Represents a dipeptide made of two amino acids, alanine and serine, linked by a peptide bond.

2,4-dinitrofluorobenzene

A chemical compound featuring a benzene ring substituted with two nitro groups (NO2) at the 2 and 4 positions and a fluorine atom at the 1 position.