movement inside the cell

Question 1

1

what does one gene of the amino sequence code for

Answer 1

one polypeptide

Question 2

2

what does the ribosome do

Answer 2

synthesises the polypeptide

Question 3

1

describe stage one of protein production

Answer 3

the nucleus contains DNA, inside the nucleus an mRNA copy of the DNA is made. The mRNA leaves the nucleus via a nuclear pore and attaches to a ribosome on the RER in the cytoplasm

Question 4

describe stage two of protein production

Answer 4

the ribosomes synthesise the polypeptide

Question 5

describe stage three of protein production

Answer 5

the RER then transports the protein through the cell within its cisternae

Question 6

describe stage four of protein production

Answer 6

at the end of the RER the protein is packaged into a transport vesicle- it is pinched of the RER then moves towards and fuses with the golgi body

Question 7

describe stage five of protein production

Answer 7

the golgi body chemically modifies the protein- could produce glycoproteins (adding carbohydrates to the protein) or lysosomes

Question 8

describe stage six of protein production

Answer 8

the modified protein is packaged off into a secretory vesicle - moves towards and fuses with the plasma membrane of the cell- protein is secreted from the cell by exocytosis- requires ATP that is synthesised by the mitochondria by aerobic respiration