Molecules of life, B3a

Hi guys, this is just something i made as part of my revision and i thought i should share it with you all who need it as part of revision.

i hope its usefull 


i'll upload the rest of the modules :)

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  • Created by: ummamah
  • Created on: 13-01-13 18:37
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Slide 1

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Molecules of
life…read more

Slide 2

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Fundamental processes of life
take place inside cells.
Cytoplasm ­ where chemical
reaction take place
Cell membrane ­ allows
movement in and out of
Nucleus ­ contains genetic the cell
information and controls what
cell does
Mitochondria - respiration takes
place inside mitochondria,
supplying energy for the cells. Cells
that have a high energy
requirements e.g. sperm cells, liver
cells have large numbers of
Some structures are too small to
see with a light microscope, e.g.
ribosomes are in the cytoplasm
and are the site of protein
synthesis…read more

Slide 3

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Genetic information
Inside the nucleus of every cell
are chromosomes which carry
genetic information In the form
of genes.
The order of the bases provides the genetic code that
controls cell activity
Each gene has a different sequence or
bases. The DNA molecules in a cell form a
complete set of instructions for how the
organism should be constructed and how its
individual cells should work.
GENES = region of chromosomes that carries info about
characteristics…read more

Slide 4

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Genetic information
The nucleus of each cell contains a
complete set of genetic instructions. The
instructions are carried by genes on
Chromosomes are long
coiled molecules of DNA,
divided up into regions
called genes.
Genes are made from a chemical
called DNA (deoxyribonucleic acid)
Most body cells have the same number of
chromosomes, in matching pairs ­ human cells
have 23 pairs
Gametes contain individual chromosomes and
therefore have exactly half the number of normal
cells…read more

Slide 5

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DNA controls the production of proteins.
Proteins are needed for growth and
The information in genes is in the form of
coded instructions called the genetic
code. The genetic code controls cell
activity and consequently some
characteristics of the organisms.
A DNA molecule is made of 2 strands
coiled around each other in a double helix
(spiral). The genetic instructions are in
the form of a chemical code made up of 4
bases. These bases bond together in
specific pairs forming cross links.
Each gene contains a
different sequences of
bases. Genes are like
recipes for proteins; each
gene codes for a particular
protein…read more

Slide 6

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The four bases in DNA A,C,G and T
On opposite strands of the DNA
A always bonds with T
C always bonds with G
This is complementary `base pairing'…read more

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