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.
<span>The nurse conducting wound care should choose a dressing that
keeps the periwound skin dry and the surgical wound bed moist to contribute
healing. The dressing used for wound care should control exudate from the
wound, but it should not desiccate the wound bed. There must be a pressure in
application while cleaning the periwound and wound may deepend the wound bed. Using
sterile normal saline and a sterile gauze to clean the surgical wound reduces
the incidences of infection.</span>
