Question

Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for several hours withnonradioactive leucine. Photographic emulsions are prepared at different times during the chase. Where would the black spots appear on an emulsionprepared 3 hours after the pulse?
A- Rough ER
B- Secretory vesicles
C- Golgi apparatus
D- Exterior of the cell

Answer 1

Answer:

Exterior of the cell

Explanation:

Pancreas is a gland found behind the stomach and it secretes digestive enzymes into the duodenum.

Digestive enzymes are proteins hence leucine will form part of the enzymes.

Digestion of food takes approximately three hours. Therefore, if labelled Leucine  is chased down with non radioactive leucine.

Black spots will appear on the exterior of the cells because digestive enzymes are extracellular enzymes .