Biology Exam Paper 1

7/27/2019 Biology Exam Paper 1

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1. All living things are made up of basic units called..A nucleusB cellsC cytoplasmD nucleoplasm

2. Diagram 1 shows an animal cell.

What is the structure labeled X?A NucleusB Golgi apparatusC MitochondrionD Rough endoplasmic reticulum

3. Which of the following cellular components is not found in an animal cell?

A C

B D


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4. Which of the following organelles is covered with ribosomes on its outer surface?A Smooth endoplasmic reticulumB Rough endoplasmic reticulumC Golgi apparatus

D Mitochondria

5. Diagram 3 shows an organism

The organism shown above reproduces byI. Forming sporesII. buddingIII. binary fissionIV. regeneration

A. I and IIB I and III

C II and IVD II, III, and IV

6. What are the main functions of the nervous system?

I. detects stimuliII. transmit nerve impulses and integrates the activities of other systemsIII. controls the physiological processors in conjunction with the endocrine systemIV. regulates the osmotic balance of the blood

A II and IB III and IIC I, II and IIID I, II, III and IV


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7.

Defends the body against infection

Returns excess tissue fluid to theblood

The above statement refers to the A endocrine systemB lymphatic systemC muscular systemD excretory system

8. Which of the following are the physical factors that affect the internal environmentof organisms

I temperatureII blood pressure

III osmotic pressureIV pH

A I and IIB II and IVC I, II and IIID II, III and IV

9. Which of the following is not a plant organ?A Leaves

B StemsC XylemsD Flowers

10. What will happen if plants do not have cell walls?A Unwanted substances would enter the cell.B Plant cells would lose their shape and rigidity.C Useful substances would flow out of the cell.D Activities of the cell cannot be carried out.


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11. Diagram below shows the structure of a plasma membrane based on the fluidmosaic model.

What is X and Y?

X Y

A Lipid Protein

B Protein LipidC Protein Phospholipid

D Phospholipid Protein

12. Which of the following processes involve diffusion?

I The intake of oxygen into the alveolusII The absorbtion of glucose and amino acids by cells in the villi of the small

intestine.III The absorbtion og digested food through the villi of the small intestine.IV The intake of mineral ions by the root hairs of a plant.

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

13. Which of the following processes is involved in the transport of sodium ions againstthe concentration gradient?A OsmosisB Active transport

C Simple diffusionD Facilitated diffusion


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14. Which of the following molecules move across the plasma membrane by simplediffusion?I WaterII OxygenIII Starch

IV Carbon dioxide

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

15. An experiment is carried to study the movement of substances across the Viskingtubing. The result of the Benedicts test and the iodine test at the beginning and atthe end of the experiment are shown in table in below.

Test Colour of the liquid in boiling tubeBeginning of experiment End of experiment

Benedictstest

Blue solution Brick red precipitate

Iodine test Brown solution Brown solution

What inference can be made from the experiment?

A The Visking tubing is permeable to glucose molecules.B The Visking tubing is permeable to starch molecules.

C The Visking tubing is permeable to both glucose and starch.D The Visking tubing is not permeable to glucose and starch molecules.

16. Which of the following processes involves active transport?A Uptake of icons by root hair cells of a plantB Absorption of digested food in the villusC Absorption of water by root hair cells of a plantD Gaseous exchange between the alveoli and the blood capillaries.


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17. Diagram 7 shows the structure of a plant cell before and after it has been immersedin solution P.

What is solution P and the process that takes place in the plant cell?

Solution P Process

Distilled water Plasmolysis

Distilled water Deplasmolysis

10% sucrosesolution

Plasmolysis

15% sucrosesolution

Haemolysis

18. The diagram shows a strip of a mustard green after it has been immersed insolution Z.

Which of the following is solution Z?A 0.1% salt solutionB distilled waterC 1.5% sucrose solutionD 30% sucrose solution

A

B

C

D


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19. A piece of an onion epidermis is placed in 30% sucrose solution. Which of thefollowing shows the shape of the cells after 30 minutes.

A

B

C

D


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20. Which of the following correctly describes the effects of excessive use of chemicalfertilisers?

I the soil solution becomes hypertonicII the roots cells become flaccid

III the plasma membrane of the root cells are destroyedIV Causes wilting in plantA II and IV onlyB I.II,ang IV onlyC II,III,and IV onlyD I,II,III,and IV

21.Which of the following substance acts as a medium for biochemical reactions in a

cell?

A Water

B Lipid

C Glucose

D Amino acid

22.The diagram shows the structure of a nucleotide.

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

Phosphategroup

Nitrogenousbase

Sugar

Phosphate

group

Sugar Nitrogenous

baseSugar Phosphate

groupNitrogenousbase

Nitrogenousbase

Sugar Phosphategroup


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23.Which of the following carbohydrates are examples of polysaccharides?

I Starch

II Lactose

III Glycogen

IV Cellulose

A I, II and III only

B I, III and IV only

C II, III and IV only

D I, II, III and IV

24.Which of the following carbohydrates has a structure as shown in the diagram?

A Starch

B Glycogen

C Galactose

D Cellulose

25.Which of the following have the structure of a protein as shown in the diagram?


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I Enzymes

II Antibodies

III Cholesterol

IV Haemoglobin

A I and II only

B I, II and IV only

C II, III and IV only

D I, II, III and IV

26.Which of the following statements about protein is not true?

A The monomer of protein is amino acid.

B Non-essential amino acids cannot be synthesized in humans

C The linear sequence of amino acids in protein molecule is called the primarystructure

D An example of a quartenary-structured proteins in haemoglobin

27.The main types of lipids are listed below, except

A oils


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B steroids

C hormones

D phospholipids.

28.The diagram shows a structure of one lipid molecule

The part labeled Q represents

A phosphate

B glycerol

C fatty acid

D amino acid


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29.The diagram shows the mechanism of an enzyme reaction on a substance

What conclusion can be made about the characteristics of an enzyme?I An enzyme reaction is very specificII An enzyme reaction is affected by temperatureIII An enzyme speeds up the rate of chemical reaction.IV An enzyme remains unchanged at the end of the reaction.

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

30.Which of the following graphs shows the effect of temperature on the rate of anenzyme-catalysed reaction?


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31.The diagram shows a stage in a cell division

This stage of cell division isA metaphaseB anaphase IC anaphaseD metaphase I

32.Which of the following shows the correct sequence for cell division?I G2II G1

III MIV SA I, II, III IV

B II, IV, I, IIIC I, II, IV, IIID II, III, IV, I

33. Arrange the diagrams in the rightsequence for mitosis.

A IV, III, I, II

B I, IV, II, IIIC III, II, I, IVD II, I, IV, III


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34.Which of the following cells shows the cell at the mitotic metaphase stage?


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35.The figure shows the stages of division by mitosis

Which of the following shows the correct sequence of the events?

A S, Q, P, RB R, Q, P, SC Q, P, S, R

D P, Q, R, S

36.All somatic cells that are diploid originate from theA gameteB autosomeC chiasmaD zygote


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37.The diagram shows a phase in nuclear division

What is this phase?

A prophaseB anaphaseC metaphaseD telophase

38.Which of the following statements are true about mitosis?I produces two daughter cells that are diploidII daughter cells are the same genetically as the parent cellIII chromatid pairs separate during the anaphase stageIV homologous chromosomes undergo synapsis during the prophase stage.

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

39. Which of the following substances may bring harm to the process of mitosis and

meiosis?I X-rayII FungicidesIII BenzeneIV Mustard gas

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


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40. The diagram shows an animal cell at one of the stages in meiosis.

Which of the following is the number of chromosomes in the daughter cells after thedivision?

A n = 2B n = 4C n = 8D n = 16

41. The following statements are about an organelle of a cell.

What is the organelle?

A Vacuole C Golgi body

B Nucleus D Ribosome

Exists freely in the cytoplasm or is attached to the rough

endoplasmic reticulum.

Site of the protein synthesis


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42. The diagram shows the liquid composition of the human body.

Which of the following form the internal environment?

A P, Q, R C P, R, S

B Q, R, S D P, Q, S

43. Which of the following is a connective tissue?

A C

B D


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44. What are the processes involved in the movement of water and mineral ions into

root hairs?

Water Mineral ions

A. Facilitated diffusion Osmosis

D. Active transport Osmosis

C. Osmosis Active transport

D. Osmosis Facilitated diffusion

45 Which of the following onion cells were immersed in a hypotonic solution?


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46. The graph shows the changes in mass of potato strips immersed in different

concentrations of sucrose solution.

Based on the above graph which of the following concentrations of sucrose

solution should be used so that a flaccid potato strip regains its turgidity?

A 1.5 g per 100 ml C 3.5 g per 100 ml

B 2.5 g per 100 ml D 4.5 g per 100 ml

47 A plant cell is immersed in distilled water.Which of the following is true about the movement of the water molecules in the

early stage ?

A No water molecules are entering or exiting the cell

B. The rate of water molecules entering and exiting the cell is the same

C. The rate of water molecules entering the cell is higher than exiting the cell

D. The rate of water molecules exiting the cell is higher than entering the cell


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48 The diagram shows the molecular structure of three food classes.

Which food classes do X, Y and Z belong to?

X Y Z

A Carbohydrate Protein Lipid

B Protein Carbohydrate Lipid

C Protein Lipid CarbohydrateD Lipid Carbohydrate Protein


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49. Diagram below shows the rate of enzyme hydrolysis reaction, R and S in the

human body.

Which of the following is true about enzymes R and S?

Enzyme R Enzyme S

A Secreted in the stomach Secreted into the duodenum

B The active site changes at pH

more than 4

The active site changes at pH

more than 7

C R is trypsin S is lipase

D Synthesized in the rough in the

endoplasmic reticulum

Synthesized in the smooth

endoplasmic reticulum

50 The diagram below shows the breaking down of complex molecules by anenzyme. Which of the molecules A, B, C and D represents the substrate?


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Answer scheme

1. B 11. D 21. A 31. C 41. D

2. B 12. B 22. B 32 B 42. C

3. D 13 B 23. B 33. C 43. A

4. B 14. B 24. A 34. B 44. C

5. B 15. A 25. A 35. A 45. A

6. C 16. A 26. B 36. D 46. A

7. B 17. B 27. C 37. C 47. C

8. C 18. D 28. B 38. C 48. B

9. C 19. D 29. A 39. D 49. A10. B 20. B 30. B 40. A 50. B

Biology Exam Paper 1

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