Pages in this set

Page 1

Preview of page 1
STRUCTURE OF DNA
DNA is the chemical that determines inherited characteristics and it contains vast
amount of information in the form of genetic code.
DNA is made up of three basic components that
combine to form a nucleotide.


NUCLEOTIDE STRUCTURE
It is made up of three components:-
DEOXYRIBOSE SUGAR
A…

Page 2

Preview of page 2
always be made up of one of each type.

Adenine always pairs with thymine and has two
hydrogen bonds
Guanine always pairs with cytosine and has 3
hydrogen bonds
As a result of this adenine is said to be complementary
to thymine and guanine is complementary to cytosine


THE DOUBLE…

Page 3

Preview of page 3
It is extremely large molecule therefore carries an immense amount of genetic
information.
By having the base pairs within the helical cylinder of the
deoxyribose-phosphate backbone, the genetic information is protected from
corruption by outside chemicals and physical forces.

DNA IS NOT MADE UP OF AMINO ACIDS IT IS MADE…

Page 4

Preview of page 4
More recently the region of DNA that carries the information for a polypeptide
has been called a cistron instead of a gene

A cistron is made up of regions called introns and exons.
Exons are sections of DNA that code for amino acids
Introns are sections of nonsense DNA which…

Page 5

Preview of page 5
REPLICATION OF DNA
Cell divides in two main stages:-

Nuclear division- it is the process by which nucleus divides. There are two
types of nuclear division, mitosis and meiosis
Cell division- it follows nuclear division and is the process by which the
whole cell divides.

Before a nucleus divides its…

Page 6

Preview of page 6

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »