Download 1.-Types-of-microbes

Unit 1 – Living Cells
• Topic 1 – Cells and DNA
1.
2.
3.
4.
Animal and plant cells
DNA, genes and chromosomes
Cell Division
DNA profiling
• Topic 2 – Microbes!
1. Types of Microbes
2. Controlling the growth of microbes
3. Microbes in industry
Types of microbes
LEARNING OUTCOMES
• State another term for ‘microbe’
• State what a microbe is
• State the 3 types of microbes
• Set up an agar dish to view microbial
growth
Think / Pair / Share…
• What is a ‘microbe’?
• What is a ‘micro-organism’?
• Can you name 3 different types of
microbes?
• How can we see microbes?
Microbes
• Microbes are
single-celled
organisms
(unicellular) that
are too small to
be seen with the
naked eye
• Another word for
a microbe is
“micro-organism”
3 main types of microbes:
• Viruses
• Bacteria
•Fungi
http://www.cellsalive.com/howbig.htm
True or False?
There are more bacteria on
your hands then there cells in
your body
True or False?
The bacteria in your
intestines alone would fill a 2L
bottle of Coke
True or False?
Gut bacteria help us absorb
nutrients and actually produce
vitamins B & K for us to absorb
True or False?
The intestine of a fetus is
sterile
True or False?
A lack of gut bacteria has
been linked to increased
chance of allergies
True or False?
Gut bacteria pass between
mother and baby through
breast milk
True or False?
Microbes cause many
different diseases such as
AIDS and TB
3 main types of microbes:
• Viruses
• Bacteria
•Fungi
Growing Microbes
• If microbes are left to grow, you can
eventually see them without a
microscope!
• You grew microbes on bread in S1!
• But now we will use agar to grow
microbes!
Growing Microbes
• Agar is a gelatine like substance that
contains nutrients. The microbes feed
on these nutrients and grow on the agar.
• Today you will:
– Investigate where microbes grow and set
up your agar dishes
– Place them in an incubator at 30°C for a
week
Growing Microbes
Growing Microbes
• Now that you have set up your dishes –
we will look at the results next week!
• Microbial growth on hands VIDEO! (4
mins)
• http://www.youtube.com/watch?v=1xuE
owtB7qg
Types of microbes
LEARNING OUTCOMES
• State another term for ‘microbe’
• State what a microbe is
• State the 3 types of microbes
• Set up an agar dish to view microbial
growth
Types of microbes
LEARNING OUTCOMES
• Identify what a bacterial cell looks like
• Identify what a yeast cell looks
• State what type of microbe Yeast is
Viewing microbes
Aim: To use the microscope to view different microbes
Yoghurt bacteria
Yeast Solution
What bacterial cells look like under
the microscope:
What yeast cells look like under the
microscope:
unicellular
billions
bacteria
smallest
viruses
biggest
Bacterial cell
Site of chemical
reactions
Contains
genetic
material
Provides
protection
for the
bacterium
Helps the
bacterium
to move /
swim
Helps the
bacterium keep its
shape, provides
support
Controls what
enters and
leaves the
bacterium
Bacteria come in all shapes and
sizes!
Yeast cell
Viewing yeast cells under the
microscope
Answers to Questions
a) What is missing from a bacterial cell that an animal cell
has?
Nucleus
b) Where does the bacterium cell store its chromosomes?
In the cytoplasm
c) What part of the bacterial cells do you think helps it to
swim and move?
Flagellum
d) What similarities are there between the yeast cell and an
animal cell? They both have a cytoplasm, nucleus and cell membrane
e) What similarities are there between the yeast cell and a
plant cell?
They both have a vacuole and a cell wall
f) Yeast cells are described as both animal and plant cells.
Why do you think this is?
Because the yeast cell contains both animal and plant structures
Types of microbes
LEARNING OUTCOMES
• Identify what a bacterial cell looks like
• Identify what a yeast cell looks
• State what type of microbe Yeast is
Quiz
• Identify the microbe
• Label parts A and B
A
B
Quiz
• Identify the microbe
• Label parts A and B
A
B
Quiz
• Identify the microbe
• Label parts A and B
A
B
Quiz
• Identify the microbe
• Label parts A, B and C
A
C
B