Refer to the metabolic pathway illustrated above. If A, B, and C are all required for growth, a strain that is mutant for the gene-encoding enzyme A would be able to grow on medium supplemented with _____.
A) nutrient A only
B) nutrient B only
C) nutrient C only
D) nutrients A and C
Answer:
B) nutrient B only
Explanation:
The mutant has a mutation in the gene that codes for the enzyme A. Therefore, this mutant would not be able to convert the substance A into B. Without the presence of substance B, the final product can not be formed. However, if the mutant is supplemented with the substrate "B", it can convert the B into the final product (substance C). Therefore, the mutant would be able to grow in the medium to which the already prepared substance B has been added.
The process is called <span>alcoholic fermentation or also known as Ethanol fermentation. </span>An anaerobic pathway that is transferred by yeasts in which straightforward sugars are changed over to ethanol and carbon dioxide. The procedure of liquor aging enables yeasts to separate sugar without oxygen and results in side-effects that people advantage from.
