Download Useful bacteria are used in the production of yoghurt

CLASSIFICATION
STRUCTURE
• procaryotic unicellular
organisms which are found
everywhere.
•Small group of bacteria are
harmful but generally bacteria
are benefit (useful).
•Useful bacteria are used in the
production of yoghurt and
cheese.
• Some bacteria cause diseases.
This type of bacteria is called
pathogenic bacteria.
• Pathogenic bacteria cause
disease such as tuberculosis,
cholera, diptheria, pneumonia,
typhoid and teeth decay.
STRUCTURE OF BACTERIA
• *have
cell membrane,
cytoplasm, and hereditary
material (DNA).
• *have also cell wall.
• *Have ribosomes to produce
protein.
•Some bacteria have mesosome
• Aerobic respiration takes place in
mesosome of bacteria.
• Energy is produced at the end of the
aerobic respiratoin.
• Reproduce by binary
fission.
•Some bacteria may contain free
chlorophyll in its structure..
• Most bacteria also have flagella to
provide motion.
Types of bacteria according to their shape;
a) Bacillus
b) Coccus
c) Vibrio
d) Spirillia
Types of bacteria
according to their nutrition
•Hetetrophs
•Autotrophs
1. Autotrophic Bacteria:
• can synthesize their own food.
• If bacteria use sunlight as an energy
source, they are known as
phototrophs.
• However some bacteria obtain their
energy from NH3 ad H2O. This type of
bacteria are called chemotrophs.
2. Hetetrophic Bacteria:
obtain their foodstuffs from other
organisms.
*Sabrobes (Saprophytes) are
hetetrophs which live on dead
organisms.
• They decompose dead organisms.
• They have an important role in the
recycling of material such as Nitrogen.
• Some hetotrophic bacteria are
parasitic.
Types of bacteria according to
their oxygen dependency;
a) Anaerobic bacteria
b)Aerobic bacteria
•Aerobic bacteria are require
O2 to obtain energy from food.
•Anaerobic bacteria don‘t need
oxygen for production of
energy.
Types of bacteria according to
the gram staining;
a)Gram (+):
A group of bacteria which paints
with gram stain.
b)Gram (-):
A group of bacteria which doesn't
paint with gram stain.
Types of bacteria
according to their flagella;
a) Flagellate:A group of bacteria
that have flagella.
b) Non-flagellate: A group of
bacteria that don’t have flagella.
• Bacteria reproduce both sexually
and asexually.
• They divide into 2 parts to form
new offsprings by binary fission.
• They reproduce sexually by
Conjugation.