Chapter 4 Chemical Composition of the cell

Question 1

Approximately _________ of the human body is made up of water

Answer 1

70%

Question 2

Properties of water

Answer 2

Polarity of water
High specific heat capacity
Adhesive force
Cohesive force

Question 3

Importance of water in our life

Answer 3

Maintain the stability of temperature in cells
Water as organic solvent
Transportation of water and mineral salt

Question 4

Carbohydrates consist of what?

Answer 4

Carbon
Hydrogen
Oxygen

Question 5

Type of carbohydrates

Answer 5

Monosaccharides
Disaccharides
Polysaccharides

Question 6

Define monosaccharides and give examples.

Answer 6

Simple sugar
Glucose ( Plants and fruits )
Fructose ( Sweet fruits and honey )
Galactose ( Milk )

Question 7

Define disaccharides and give examples

Answer 7

Combination of two monosaccharides
Maltose Glucose + Glucose ( Malt sugar )
Sucrose Glucose + Fructose ( Cane sugar )
Lactose Glucose + Galactose ( Milk sugar )

Question 8

Define polysaccharides and give example

Answer 8

Built from many of monosaccharides
Cellulose
Starch
Glycogen

Question 9

Non- reducing sugar

Answer 9

Sucrose

All Polysaccharides

Question 10

Properties of monosaccharides, disaccharides, polysaccharides

Answer 10

Taste sweet, soluble in water, can crystalise (except polysaccharides)

Question 11

Importance of polysaccharides to organism

Answer 11

Structure component (Chitin)
Store energy ( starch in plant cell, glycogen in human)

Question 12

Define condensation process

Answer 12

Binds two simple molecule together to form large molecule with elimination of one water molecule