WRONG Qs- Term 1

Question 1

Function of endoplasmic reticulum (1 mark):

Answer 1

Protein synthesis

Question 2

Function of Golgi apparatus (1 marks):

Answer 2

Modifying protein (adds carbs to protein) making a glycoprotein

Question 3

Describe the structure and function of the nucleus (4 marks):

Answer 3

Structure:
- double membrane AND pores
- chromosomes
- nucleolus

Function:
- holds genetic information for polypeptides
- DNA replication occurs
- production of mRNA

Question 4

Explain why the organelles visible in the photograph would not have been visible in an optical light microscope (2 marks):

Answer 4

1) low resolution
2) because wavelength of light is not short enough

Question 5

Describe how you could make a temporary mount of a piece of plant tissue to observe the position of starch grains in the cells when using an optical (light) microscope (4 marks):

Answer 5

1) add a drop of water to glass slide
2) obtain thin section and place on slide
3) Stalin with iodine in potassium iodide
4) lower cover slip using mounted needle

Question 6

Describe how a peptide bound is formed between two amino acids to form a dipeptide (2 marks):

Answer 6

1) a condensation reaction- loses a water molecule
2) formed between an amine and hydroxyl group

Question 7

Describe how the secondary structure of a polypeptide is produced by bonds between amino acids (2 marks):

Answer 7

1) hydrogen bonds
2) between NH and C=O group

Question 8

Explain why two proteins have the same number and type of amino acids but different territory structures (2 marks):

Answer 8

1) different primary structure
2) form disulphide bonds in different places

Question 9

Compare and contrast the structure of starch and cellulose (6 marks):

Answer 9

1) starch is bigger and cellulose is smaller
2) starch contains A- glucose and cellulose contains B-glucose
3) both are glucose polymers
4) both contain glycosidic bonds
5) both contain hydrogen, carbon and oxygen only
6) both contain glucose
7) starch is coiled, cellulose is straight

Question 10

Describe how a triglyceride molecule is formed (3 marks):

Answer 10

1) formed between glycerol and three fatty acids
2) ester bond is formed
3) condensation reaction forming 3 molecules of water r

Question 11

Describe how the structure of glycogen is related to it’s function (6 marks):

Answer 11

1) helical so compact
2) branched- more enzymes- faster hydrolysis
3) polymer of glucose so easily hydrolysed
4) large, insoluble molecules do not affect the water potential of the cell
5) glucose polymer so provides respiratory substrate for enzymes