SUMMARY CHAPTER 4 CHEMICAL COMPOSITION IN A 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

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

• Heat insulator

• Antibody maker

• Energy source

• Enzymes

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

• I

• I, II

• I, II, III

• I, II, III, IV

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

Which food contains the highest lipid content?

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