Chapter 4 Chemical Composition of the Cell

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

• Polar

• Non-polar

• Hydrophobic

• Dissolve in oil

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

• Universal solvent

• Medium of transport

• Medium for biochemical reactions to take place

• Maintenance of health

Tags

NGSS.MS-LS2-1

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

• Cellulose – structural polysaccharide in plant cell wall

• Chitin – an important component in the exoskeleton of the insects

• Glycogen – an energy storage in animals

• Galactose – give sweet taste to the germinating corns

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?

• Maltose

• Lactose

• Galactose

• Cellulose

Tags

NGSS.HS-PS1-2

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

• Glucose

• Lactose

• Sucrose

• Galactose

The equation below shows the breakdown process of disaccharides.

Maltose + Water → Glucose + Glucose

This reaction is called?

• Dialysis

• Condensation

• Hydrolysis

• Assimilation

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

• I, II, III

• I, II, IV

• I, III, IV

• II, III, IV

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

• Heat insulator

• Antibody maker

• Energy source

• Enzymes

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

• condensation

• damage

• termination

• denaturation

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

• I

• I, II

• III, IV

• IV

Tags

NGSS.HS-LS1-6