Molecule of Life Tutor

7/28/2019 Molecule of Life Tutor

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SB016 SEMESTER I SESSION 2013/2014

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TUTORIAL 1

TOPIC : MOLECULES OF LIFE

PART A : MULTIPLE CHOICE QUESTIONS

1. Which of the following statements is TRUE about the property of water?

A. Large amount of energy is needed to increase its temperature.B. Its molecules are bound together mainly by ionic bonds.

C. The highest density of water occurs below its freezing point.

D. Water acts as a solvent for non-polar molecules.

2. Lactose is a reducing sugar because

A. It contains a glucose and a galactose

B. It has a hydroxyl group

C. It contains aldehyde group

D. It cannot be crystallized in Benedicts solution

3. Which of the following statement about amylose and cellulose is TRUE?

Amylose Cellulose

A. -1,4 - glycosidic bond - 1,4- glycosidic bond

B. - 1,4- glycosidic bond -1,4- glycosidic bondC. Water soluble Insoluble in water

D. Branched Unbranches

4. A peptide bond is form between

A. An aldehyde group and an amino group

B. An aldehyde group with an ester bondC. An aldehyde group with a carboxyl group

D. A carboxyl group with an amino group

5. FIGURE 1below shows a dipeptide. What does X represent?

FIGURE 1


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A. C.

B. D.

6. Which of the following statements about the amino acid are TRUE?

I. If R group is H, glycine amino acid is formed.

II. If R group is CH2OH, serine amino acid is formed.

III. If R group is CH2COOH, lysine amino acid is formed.

IV. If R group is C4H8NH2, aspartic acid is formed.

A. I and II

B. I, II and III

C. I, III and IVD. All above

7. FIGURE 2 shows a simple drawing of triglyceride.

FIGURE 2

Which statement is NOT true about molecule X before condensation to form

triglyceride?

A. It is a type of alcohol.

B. It contain three hydroxyl group.

C. Its formula is C3H6 O3.

D. It form ester bond with fatty acids.


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8. Which of the following statement are TRUE about triglycerides?

I. It is formed by the condensation of three fatty acids with one glycerol.

II. It has lower hydrogen to oxygen ratio compared with carbohydrate.

III. It forms a lipid bilayer in the cell membrane.

IV. It is more saturated with hydrogen compared with phospholipids.

A. I only

B. I, II and III

C. I, II and IV

D. All above

9. FIGURE 3below shows a nucleotide found on DNA.

FIGURE 3

Which of the following statements about the molecule is TRUE?

X Y Z

A. Contains phosphate Ribose sugar 4 types

B. Contains phosphate Deoxyribose sugar 4 types

C. Contains nitrogen Ribose sugar 5 typesD. Contains phosphate Deoxyribose sugar 5 types

10. How would the complementary strand of DNA appear if the original strand of DNA

contained the bases T A G C in that order?

A. U A C G

B. G C A T

C. T A C G

D. A T C G


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PART B : STRUCTURED QUESTIONS

1. FIGURE 1 shows the molecular structure of water molecule.

FIGURE 1

a. Name the bond A and B.

A : __________________________________________________________

B : __________________________________________________________[2 marks]

b. Show how bond A are formed when one water molecule is joined with anotherfour water molecules.

[2 marks]

c. State THREEproperties of water.

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________[3 marks]


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d. Explain how water strider can walk and run on a pond without breaking the

surface?

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

[3 marks]

2. FIGURE 2 shows the structure of different type of monosaccharide.

Monosaccharide A Monosaccharide B

FIGURE 2

a. Name monosaccharide A and B

Monosaccharide A : ______________________________________________

Monosaccharide B : ______________________________________________

[2 marks]

b. Show the condensation process of monosaccharide A.

[3 marks]


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c. What substance would be produce after the process in (b)?

__________________________________________________________________

[1 mark]

d. List TWO common properties of all monosaccharide and disaccharide.

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

[2 marks]

e. Name a storage polysaccharide found in human body?

__________________________________________________________________

[1mark

]

f. 199 molecules of glucose are linked through 1,4 glycosidic bond to form

polysaccharide. How many water molecules will be formed through condensationprocess ?

__________________________________________________________________[1 mark]

3. FIGURE 3 shows the structural formula for monomer A and monomer B that formstriglycerides.

Monomer A Monomer B

FIGURE 3

a. State monomer A and monomer B.

Monomer A : ____________________________________________________

Monomer B : ____________________________________________________

[2 marks]


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b. Give ONE different between saturated fatty acid and unsaturated fatty acids.

__________________________________________________________________

__________________________________________________________________

[1 mark]

c. Show the formation of triglycerides.

[3 marks]

d. Name the type of chemical reaction occur when glycerol and three fatty acids join

together to form triglyceride structure.

__________________________________________________________________

[1 mark]

e. Give TWO importance of lipid.

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

[2 marks]

f. Lipid and carbohydrates function as energy-storage molecules. Lipids store more

energy per gram compared to carbohydrates. Why?

__________________________________________________________________[1 mark]


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4. FIGURE 4 shows two level of protein organization.

Y Z

FIGURE 4

a. Determine the structure level of Y and Z protein.

Y : __________________________________________________________

Z : __________________________________________________________

[2 marks]

b. Name the type of bonds labeled V and W.

V : __________________________________________________________

W : __________________________________________________________

[2 marks]

c. Haemoglobin is an example for Z. Give TWO types of polypeptide chains that

made up this protein.

__________________________________________________________________

__________________________________________________________________

[2 marks]

V

W


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d. Explain how heating may affect the tertiary structure of protein?

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________[2 marks]

e. Give ONE example of proteins based on the following functions:

Function Example

Protection from diseases

Structural protein

[2 marks]

5. FIGURE 5 shows two different types of polynucleotide.

Polynucleotide A Polynucleotide B

FIGURE 5

a. Name polynucleotide A and B.

A : __________________________________________________________

B : __________________________________________________________

[2 marks]

D

C


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b. Name the bond labeled C and D.

C : __________________________________________________________

D : __________________________________________________________

[2 marks]

c. Name the type of chemical reaction occur when nucleotides join together to form

polynucleotide structure.

__________________________________________________________________[1 mark]

d. If base sequence for strand 1 is 5 GATC 3, what is the base sequence for strand2?

_________________________________________________________________

[1mark

]

e. List THREE structural characteristic of polynucleotide A base on Watson Crick

Model.

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________[3 marks]

f. Give the important of this macromolecule to living organism?

__________________________________________________________________

__________________________________________________________________[1 mark]

PART C : ESSAY QUESTIONS

1. Explain FOURproperties of water in living organism.

[10 marks]

2. Compare globular protein and fibrous protein and give example for each.PSPM 2009/2010

[10 marks]

3. Differentiate between RNA and DNAPSPM 2009/2010

[10 marks]

Molecule of Life Tutor

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