Name : _____________________________ Chapter 4 Chemical Composition of the Cell __________________________________________________________________________________________

______________________________________________________________________________________ WAJA BIOLOGY 2013 JPN PERAK

WORKSHEET 4.2 : The Chemical Compounds in the cell

Fill in the blanks with the correct answers.

1.

2. Organic compounds contain the element ______________. Examples are _________,

_________, __________ and nucleic acids.

3. Inorganic compounds usually do not contain carbon atoms, for example, ___________

[7 Marks]

The Importance Of Organic Compounds

Organic compounds Importance

Protein

Made up of the ___, ___, ___ and ___

elements. Most proteins also contain S

and P.

15% of the protoplasm is made up of

protein.

Build new cells for ____________ and to

renew damaged tissues.

Required in the synthesis of ___________,

antibodies and hormones.

____

Lipid

Protein

Water

Organic

Inorganic

Carbohydr

ates

The chemical compounds in

the cell

Score __ /__ ____

2

Name : _____________________________ Chapter 4 Chemical Composition of the Cell __________________________________________________________________________________________

______________________________________________________________________________________ WAJA BIOLOGY 2013 JPN PERAK

Organic compounds Importance

Carbohydrates

Contain __, ___ and ___ .

The ratio of atom H to O atoms is

______

A primary source of ____________

Stored in plants as _____________

Cellulose forms the _________ of the plant

cell.

Stored as ____________ in human and

animal cells.

Lipids

Contain ___, ____ and ___

Examples : fats, oil, waxes, _________

and ___________

Acts as a solvent for fat-soluble vitamins

such as A, ___, ___, ___

___________ are a major constituent of the

plasma membrane

_____ prevents water loss in plants and

infection by pathogens.

Nucleic acids

A ___________ is the building block of

nucleic acids.

The structure of a nucleotide

Two types of nucleic acids:

a) deoxyribonucleic acid (DNA)

b) ribonucleic acid (RNA)

Store genetic material in the form of a code.

A nucleotide consists of a nitrogenous

base, pentose sugar and a phosphate

group.

DNA

A _____________ polynucleotide

(double helix)

Found in the _________, __________ and

____________

Genetic information is passed on from the

parent to the offspring

RNA

A ______________ polynucleotide

Found in the _______________,

_____________ and _____________

Copies the information carried by DNA for

use in protein synthesis

[31 Marks]

Phosphate group

Pentose sugar

Nitrogenous group

3