Unit 1 – Living Cells Topic 1 – Cells and DNA Topic 2 – Microbes! Animal and plant cells DNA, genes and chromosomes Cell Division DNA profiling Topic 2 – Microbes! Types of Microbes Controlling the growth of microbes 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

There are more bacteria on your hands then there cells in your body True or False? There are more bacteria on your hands then there cells in your body True

The bacteria in your intestines alone would fill a 2L bottle of Coke True or False? The bacteria in your intestines alone would fill a 2L bottle of Coke True

True or False? Gut bacteria help us absorb nutrients and actually produce vitamins B & K for us to absorb True

The intestine of a fetus is sterile True or False? The intestine of a fetus is sterile True

True or False? A lack of gut bacteria has been linked to increased chance of allergies True

Gut bacteria pass between mother and baby through breast milk True or False? Gut bacteria pass between mother and baby through breast milk True

Microbes cause many different diseases such as AIDS and TB True or False? Microbes cause many different diseases such as AIDS and TB True

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=1xuEowtB7qg

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 Yoghurt bacteria Yeast Solution Aim: To use the microscope to view different microbes Yoghurt bacteria What bacterial cells look like under the microscope: Yeast Solution What yeast cells look like under the microscope:

unicellular billions bacteria viruses smallest biggest

Bacterial cell Site of chemical reactions Contains genetic material Helps the bacterium to move / swim Controls what enters and leaves the bacterium Provides protection for the bacterium Helps the bacterium keep its shape, provides support

Bacteria come in all shapes and sizes!

Yeast cell

Viewing yeast cells under the microscope

Answers to Questions Nucleus Flagellum What is missing from a bacterial cell that an animal cell has? Where does the bacterium cell store its chromosomes? What part of the bacterial cells do you think helps it to swim and move? What similarities are there between the yeast cell and an animal cell? What similarities are there between the yeast cell and a plant cell? Yeast cells are described as both animal and plant cells. Why do you think this is? Nucleus In the cytoplasm Flagellum They both have a cytoplasm, nucleus and cell membrane They both have a vacuole and a cell wall 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