ribosomes & golgi apparatus

Question 1

whats the function of ribosome

Answer 1

1. catalyse protein chain assembly
2. read the mRNA to produce polypeptides
3. allows tRNA to carry amino acid to be binded to ribosomes

Question 2

describe the structure of ribosomes

Answer 2

• combo of ribosomal proteins & RNA
• very small n dense ( 20nm diameter)
• composed of small ( 40S) and big (60S) subunits

Question 3

describe the eukaryotic ribosomes

Answer 3

• directly concerned with protein synthesis
• formed n assembled in nucleolus
• composed of protein n RNA

Question 4

function of golgi apparatus

Answer 4

• processing newly synthesised proteins ( proteins, glycoproteins, mucopolysaccarides )
• primary lysosome production
• centre for redistribution of cell membranes
• site for carbohydrate synthesis

Question 5

describe the structure golgi apparatus

Answer 5

• parallel array/stacked curved cisternae
• 3-7 cisternae stacks
• interconnected by tubules
• seperated by luman with 30nm wide

Question 6

3 pockets of ribosomes

Answer 6

a- aminoacyltRNA binding site
p- peptidyl tRNA binding site
e-exit site

Question 7

explain the ribosomal function

Answer 7

1. tRNA enters the 5’ of ribosomal complex
   2.recognise the 3-ltter-code on mRNA
2. transfer amino acid to growing polypeptide
3. exit 3’