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Section A( 50 marks )

Answer all questions

1 Which of the following is the correct sequence of stages for mitosis? A Metaphase → telophase → anaphase → prophaseB Anaphase → prophase → metaphase → telophaseC Prophase → anaphase → metaphase → telophaseD Prophase → metaphase → anaphase → telophase

2 Enzymes are highly specific in the reactions they catalyse. Which of the following statements explains this characteristic of enzymes?A Protein molecules consist of helical structures.B Protein molecules consist of many amino acids.C Each enzyme molecule has a distinctive configuration.D Protein molecules are not destroyed by heat.

3 Which of the following is not the characteristic of mitosis?A Daughter cells are genetically different from parent cell and from each

other.B Damaged cells can be replaced by production of identical new cells.C New cells produced are used for growth of multicellular organisms.D The offsprings produced are identical to the parent.

4 Which of the following statements about lipids is false?A A wax is lipid.B Unsaturated fats are liquid at room temperature.C The body doesn’t need any cholesterol.D Both male and female sex hormones are steroids.

5 Which of the elements are present in carbohydrate ? I CarbonII HydrogenIII NitrogenIV Oxygen

A I and III onlyB I, II and IV onlyC II, III and IV onlyD I, II, III and IV

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6 The DIAGRAM 1 below shows cell M and cell N. In which direction will water move between cell M and cell N?

DIAGRAM 1

A N to M by simple diffusion B M to N by active transportC N to M by active transport D N to M by osmosis

7 The DIAGRAM 2 below shows a cell cycle.

DIAGRAM 2

What is the process occur during V?A Replication of DNA.B Replication of centrioles.C Chromosomes condense and become shorter and thicker.D High metabolic rate and synthesis of proteins and cellular organelles.

8 Which elements are found in nucleic acids?

A Carbon and hydrogen.B Carbon, hydrogen and oxygen.C Carbon, hydrogen, oxygen and nitrogen.D Carbon, hydrogen, oxygen, nitrogen and phosphorus.

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9 DIAGRAM 3 shows one of the four levels in protein structures

DIAGRAM 3The level and example for such protein are

A tertiary structure, enzymes.B tertiary structure, haemoglobinC quaternary structure, enzymes.D quaternary structure, haemoglobin.

10 The DIAGRAM 4 below shows the condition of a plant cell after immersed in a particular solution for 15 minutes.

DIAGRAM 4

A Cell sap loses its mineral salts through osmosis.B It is flaccid.C The pressure of the cell increases.D It has a very high osmotic pressure.

11 Which of the following is not true about the differences between saturated fat and unsaturated fat?

12 The DIAGRAM 5 shows the structure of a nucleotide.

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Saturated fat Unsaturated fat A Solid at room temperature. Liquid at room temperature. B High cholesterol content. Low cholesterol content. C No double bond present

between two carbon atoms.Double bond present between two carbon atoms.

D Able to react with additional hydrogen atom.

Unable to react with additional hydrogen atom.

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DIAGRAM 5

What are represented by the units labelled as X, Y and Z?

X Y ZA Phosphate group Sugar Nitrogenous baseB Phosphate group Nitrogenous base SugarC Sugar Nitrogenous base Phosphate groupD Nitrogenous base Phosphate group Sugar

13 A bivalent is the name forA synapsis of a pair of homologous chromosomes.B a pair of sister chromatids.C a pair of non-homologous chromosomes.D one homologous chromosome.

14 Which one of the following nutrients, needed for the purpose of tissue growth and repair, cannot be made by the human body?A Amino acidsB ProteinC Non-essential amino acidsD Essential amino acids

15 The statement below show the use of a specific enzyme in industries and daily lives.

Based on the above information, which of the following enzymes is used?A TrypsinB ErepsinC RenninD Protease

16 The graph shows the effect of pH on the rate of reaction of enzyme X.

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Tenderising meat Separating fish skin Extracting fur from animal skin

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Enzyme X isA lactase. B salivary amylase.C trypsin. D rennin.

17Glucose Process X  

+ →Y + Water

Galactose    

What are represented by X and Y?

18 Which of the following diagrams is not true about a stage in mitosis?

A B

C

D

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  X Y

A    Condensation Maltose

B Condensation Lactose

C Hydrolysis Lactose

D Hydrolysis Maltose

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19 The DIAGRAM 6 shows a graph of rate of reaction against substrate concentration of an enzyme-controlled reaction by using 0.2% enzyme concentration.

DIAGRAM 6

A B

C D

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20 Groundnuts contain a nutrient which is broken down by lipase during germination. Which test would detect this nutrient?A Benedict’s test B Translucent paper testC Iodine test D Burette Test

21 The DIAGRAM 7 below shows diffusion through a semi-permeable membrane.

DIAGRAM 7What are P and Q?

  P Q

A Distilled water Distilled water

B 20% sucrose solution 20% sucrose solution

C 20% sucrose solution Distilled water

D Distilled water 20% sucrose solution

22 Which enzyme, substrate and conditions are needed for the digestion of food in the stomach?

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Enzyme Substrate ConditionsA amylase starch acidB amylase starch alkalineC protease protein acidD protease protein alkaline

23 The following information refers to organelle P.

• Produces lipid• Transport of proteins to be used in the cell membrane

Identify organelle P.A Mitochondrion B NucleusC Smooth endoplasmic reticulum D Golgi apparatus

24 Which of the following graphs represents the effect of pH on the rate of reaction of enzyme secreted by the pancreas?

A B

C D

25 If an animal cell is placed into a solution whose concentration of dissolved substances is higher than that inside the cell,A the cell will swell.B the cell will shrivel.

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C the cell is described as plasmolysis.D the cell is described as deplasmolysis.

Section B( 30 marks )

Answer all questions

1 The DIAGRAM 8 below shows the model of a plasma membrane.

DIAGRAM 8(a) (i) What name is given to the above plasma membrane model?

___________________________________________________________[1 mark]

(ii) Give two characteristics of the model you mentioned in (a)(i).

1:__________________________________________________________

2:__________________________________________________________[2 marks]

(b) Name the structures labelled P, Q, R and S.

P: _____________________________________________________________

Q: _____________________________________________________________

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R: _____________________________________________________________

S: _____________________________________________________________[4 marks]

(c) What is the main characteristic of structure labelled P?

_______________________________________________________________

_______________________________________________________________ [2 marks]

(d) What is the function of structure Q in plasma membrane?

_______________________________________________________________[1 mark]

2 The DIAGRAM 9 below shows a reaction catalysed by enzyme.

DIAGRAM 9(a) Name the parts labelled S, T and U.

S: _____________________________________________________________

T: _____________________________________________________________

U: _____________________________________________________________[3 marks]

(b) State two characteristics of T.

1: _____________________________________________________________

2: _____________________________________________________________

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[2 marks](c) If T represents lipase, what is U?

_______________________________________________________________

_______________________________________________________________[2 marks]

(d) State and explain the use of lipase in industry processes.

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________[3 marks]

3 The DIAGRAM 10 shows a phase in cell division.

P

Q

R

DIAGRAM 10(a) Name the parts labelled P, Q and R.

P: ___________________________________________________________

Q: ___________________________________________________________

R: ___________________________________________________________ [3 marks]

(b) (i) Name the type of cell division.

___________________________________________________________ [1 mark]

(ii) Name the phase shown above.

_____________________________________________________[1 mark]

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(c) Describe the process happen in P.

________________________________________________________________

________________________________________________________________

________________________________________________________________[3 marks]

(d) Name two phases that happens after the phase shown above.

1: _____________________________________________________________

2: _____________________________________________________________[2 marks]

END OF QUESTIONSCHEME MARKS BIO F4 ASSESSMENT 2 SECTION A

QUESTION TOPIC ANWER QUESTION TOPIC ANSWER1 5 D 14 5 D2 4 C 15 4 D3 5 A 16 4 B4 4 C 17 5 B 5 4 B 18 4 C6 3 D 19 4 C7 5 D 20 5 B8 3 D 21 4 C9 3 D 22 3 C

10 3 A 23 4 C11 4 D 24 4 C12 4 A 25 3 B13 5 C

TOPIC QUESTION3 74 115 7

SECTION B

NO ANSWER MARK1 (a) (i) Fluid mosaic model [1 mark]

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(ii) 1: Plasma membrane is comprised of the phospholipid bilayer

2: Various types of protein molecules are embedded in the plasma membrane

(b) P - Phospholipid bilayerQ - CholesterolR - Carrier proteinS - Pore protein

(c) Contain phospholipid molecules that contain hydrophilic head and hydrophobic tail.

(d) Maintain the fluidity of plasma membrane

[1 mark]

[1 mark]

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[2 marks]

[1 mark]

2 (a) S: SubstrateT: EnzymeU: Product

(b) 1: Chemical reaction catalysed by T is a reversible reaction.2: It act specifically

(c) U is glycerol and fatty acid

(d) Manufacturing detergent - detergent with added lipase can clean cloth with oil stain effectively. Or any suitable answer

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[1 mark]

[1 mark]

[2 marks]

[3 marks]

3 (a) P - ChiasmataQ - Homologous chromosomesR – Centriole

(b) (i) Meiosis (ii) Prophase I

(c) (The process of crossing over occur in P). (During crossing over), (exchange of genetic materials between two chromatid sisters takes place).

(d) 1: Metaphase I2: Anaphase I

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