protein production by a cell

Question 1

what is step 1 of protein production by a cell

Answer 1

• one gene of the DNA codes for the amino acid sequence in one polypeptide
• mRNA copy is made inside the nucleus
• this leaves the nucleus via the nuclear pore
• it attaches to the ribosomes

Question 2

what is step 2 of protein production by a cell

Answer 2

• the ribosomes synthesise the polypeptide

Question 3

what is step 3 pf protein production by a cell

Answer 3

• the RER transports the proteins through the cell with its cisternae

Question 4

what is step 4 of protein production by a cell

Answer 4

• the protein is packaged into a transport vesicle
• the vesicle is pinched off and moves towards the golgi body and fuses with it

Question 5

what is step 5 of protein production by a cell

Answer 5

• golgi body chemically modifies the protein
• may involve adding a carbohydrate to create a glycoprotein
• can also produce lysosomes

Question 6

what is step 6 of protein production by a cell

Answer 6

• modified protein is packaged into a secretory vesicle which is pinched off of the golgi body
• secretory vesicle moves towards the cell membrane and fuses with it
• the protein is secreted from the cell by exocytosis
• this required ATP

Question 7

what is step 7 of protein production by a cell

Answer 7

alternatively
- secretory vesicle may stay inside the cell
- called a lysosome and will contain protease enzymes
- lysosomes fuse with the worn out organelles and digests them
- may be able to digest a full cell