DNA is a large molecule composed of nucleotides that carry genetic information, organized into chromosomes found in the cell nucleus. Each molecule plays a crucial role in the development and functioning of living organisms, with segments called genes providing instructions for protein production. Humans possess 46 DNA molecules arranged in 23 pairs of chromosomes, which are inherited from parents.

1. NUCLEOTIDES
DNA is a large molecule found inside the cells of living things. It is
made up of different elements that carry genetic information.
DNA is made up of four basic building blocks called nucleotides.
The order of nucleotides within a strand of
DNA forms a special genetic code. This code
provides instructions for the development,
growth and functioning of all living things.
C = cytosine
G = guanine
T = thymine
A = adenine
CHROMOSOMES
DNA
Deoxyribonucleic Acid
Humans have a total of 46 DNA
molecules. These are organised
into long, coiled-up structures
called chromosomes.
Chromosomes are
found in the
nucleus (control
centre) of the cell.
A
segment
of
DNA
that
carries
the
instructions
for
making
a
specific
protein
is
called
a
gene.
They are responsible for the genetic
information that is passed down from
parents to children. Humans have 23 pairs
of chromosomes in each of their cells.