Question

Which of the following correctly describes the pathway taken by a protein destined for secretion from an animal cell?

a)rough ER → transport vesicle → Golgi → transport vesicle → lysosome → plasma membrane
b)plasma membrane → transport vesicle → Golgi → transport vesicle → rough ER
c)rough ER → transport vesicle → Golgi → transport vesicle → plasma membrane

Answer 1

Answer: C)

Step-by-step explanation:

This is a secretory pathway where protein is going through the endoplasmic reticulum, then transport vesicle and Golgi apparatus, and then the transport is going through lysosomes and the plasma cell membrane.

The Golgi apparatus is processing proteins that are made in the ER (endoplasmic reticulum).

This pathway is processing proteins and lysosomal enzymes.

Answer 2

c)rough ER → transport vesicle → Golgi → transport vesicle → plasma membrane

Step-by-step explanation:

The protein which is destined for secretion is synthesized on the rough endoplasmic reticulum. After the formation of protein, the proteins get packed into vesicles and then reaches to the Golgi apparatus.

In the Golgi apparatus, the modification of the protein molecules takes place for example sulfation, glycosylation, phosphorylation, etc. After the modification, the proteins are packed into vesicles and these packed proteins are released into the cytoplasm from where it reaches the plasma membrane and released out of the cell.