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Chapter 4 Chemical Composition of the Cell

Total questions: 15

Worksheet time: 15mins

Name
Class
Date
1.

As shown in the photo, what property of this molecule has?

a)

Polar

b)

Non-polar

c)

Hydrophobic

d)

Dissolve in oil

2.

Water is vital for survival of organisms. Which of the following is not the importance of water?

a)

Universal solvent

b)

Medium of transport

c)

Medium for biochemical reactions to take place

d)

Maintenance of health

3.

Which pair of type of carbohydrate and its function is wrongly arranged?

a)

Cellulose – structural polysaccharide in plant cell wall

b)

Chitin – an important component in the exoskeleton of the insects

c)

Glycogen – an energy storage in animals

d)

Galactose – give sweet taste to the germinating corns

4.

Carbohydrate X is a type of simple sugar. It has sweet taste. It can reduce copper (II) ions in Benedict’s solution into copper (I) ions. It is a kind of monomer. What is X?

a)

Maltose

b)

Lactose

c)

Galactose

d)

Cellulose

5.

Which of the following sugar gives negative result when reacting with Benedict’s solution?

a)

Glucose

b)

Lactose

c)

Sucrose

d)

Galactose

6.

The equation below shows the breakdown process of disaccharides.

Maltose + Water → Glucose + Glucose


This reaction is called?

a)

Dialysis

b)

Condensation

c)

Hydrolysis

d)

Assimilation

7.

Diagram here illustrates the structure level of a protein molecule. Which of the following statement is true about this structure?

I It is tertiary structure of a protein molecule

II It is precise, compact and unique

III It possesses a functioning three dimensional shape

IV One of the examples of this protein is keratin

a)

I, II, III

b)

I, II, IV

c)

I, III, IV

d)

II, III, IV

8.

Which of the following answers is not the function of protein molecule within human body?

a)

Heat insulator

b)

Antibody maker

c)

Energy source

d)

Enzymes

9.

The conformation of a protein molecule can be destroyed by heat. It is called protein ________________.

a)

condensation

b)

damage

c)

termination

d)

denaturation

10.

Diagram above shows general structure of a type of molecule. Which of the following statement is false?


I This molecule is known as amino acid

II It is a kind of monomer that is used to build protein structure including enzymes

III There are two functional groups, which are amino group and carboxyl group, attached to α-carbon

IV R group of the amino acid, which is also called side chain, has nothing to do with the chemical properties of an amino acid

a)

I

b)

I, II

c)

III, IV

d)

IV

11.

Which of the following statements about lipids are correct?

I They contain element carbon, hydrogen, oxygen and sometimes phosphorus and nitrogen

II Most lipids are insoluble in water, but soluble in organic solvents

III Lipids which are liquid at room temperature are fats

IV All kinds of lipids are bad for human health

a)

I

b)

I, II

c)

I, II, III

d)

I, II, III, IV

12.

Which food contains the highest lipid content?

a)
b)
c)
d)
13.

This food supplement contains special nutrient that helps to speed up metabolism of fats. Such nutrient belongs to:

a)

Steroid

b)

Phospholipid

c)

Wax

d)

First class protein

14.

This disease is caused by over intake of which nutrient?

a)

Amino acids

b)

Glucose

c)

Cholesterol

d)

Steroid

15.

Siti has health problem where her blood triglycerides and cholesterol levels are high. If you are her doctor, you should advise her to take in which type of food?

a)
b)
c)
d)