Free WSET Wine Production Test 2

Question 1

Glycolysis is part of both alcoholic and lactic acid fermentation cycles.

Accepted Answer

TRUE

Answer

Glycolysis is the initial metabolic pathway that breaks down glucose into pyruvate. This process serves as the first stage for both alcoholic fermentation and lactic acid fermentation, as both pathways utilize pyruvate as their starting material. Therefore, glycolysis is a common and essential precursor to both anaerobic processes.

Question 2

Lactic acid fermentation occurs in muscle cells during very strenous kind of exercise such as sprinting.

Accepted Answer

TRUE

Answer

During very strenuous exercise, such as sprinting, muscle cells may not receive enough oxygen for aerobic respiration. In these anaerobic conditions, muscles switch to lactic acid fermentation to regenerate NAD+ from NADH, allowing glycolysis to continue producing a small amount of ATP. This process results in the accumulation of lactic acid in the muscles.

Question 3

In Lactic Acid Fermentation, pyruvic acid is converted into a 2 - carbon molecule before producing lactic acid.

Accepted Answer

FALSE

Answer

In lactic acid fermentation, pyruvic acid (pyruvate) is directly converted into lactic acid by the enzyme lactate dehydrogenase. Unlike alcoholic fermentation, there is no intermediate step involving the decarboxylation of pyruvic acid into a 2-carbon molecule. The conversion is a single-step reduction.

Question 4

There are ____ hydrogen atoms found in a molecule of glucose.

Accepted Answer

Twelve

Answer

The chemical formula for glucose is C₆H₁₂O₆. This formula explicitly indicates the number of atoms of each element present in one molecule of glucose. Therefore, a molecule of glucose contains twelve hydrogen atoms.

Question 5

2 hydrogen atoms are accepted by NAD+ in the Alcoholic fermentation cycle.

Accepted Answer

TRUE

Answer

During glycolysis, which precedes alcoholic fermentation, NAD+ acts as an electron acceptor. Specifically, it accepts two electrons and one proton (H+) from the oxidation of glyceraldehyde-3-phosphate, forming NADH and releasing another proton. This effectively means NAD+ is reduced by accepting components equivalent to two hydrogen atoms.

WSET - Wine and Spirit Education Test Practice Test

WSET - Wine and Spirit Education Test Practice Test

Free WSET Wine Production Test 2