A water is the correct answer
Question:
A---enzyme A------>B----enzyme B------>C
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.
Answer:
B) It can remain, circulating in the blood indefinitely, this is not a fate of glucose circulating in the blood of a healthy individual.
Explanation:
Glucose is produced by breaking down carbohydrates, principally in the small intestine, when we eat a meal containing carbohydrates.This glucose enters the bloodstream.When glucose is in excess, the body stores it away in the form of glycogen in a process stimulated by insulin. Glycogen is a large highly branched structure, made from lots of glucose molecules linked together.Glycogen is mainly stored in the liver and muscles, therefore, excess glucose is removed from the blood stream and stored.
Insulin signals to the cell to translocate Glut 4 to the cell membrane, so that large amounts of glucose can be taken into the cell, via the Glut 4 transporters and converted into glycogen and used as a fuel for cellular activities. Furthermore with the help of insulin, converted into fatty acids, circulated to other parts of the body and stored as fat in adipose tissue.
