Growing Microorganisms

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Recommended: Yeast investigation organisms

Growing Microorganisms

Introduction/ Aim:

Yeast are a tiny form of fungi or plant-like microorganism (visible

only under a microscope) that exist in or on all living matter i.e.

water, soil, plants, air, etc. The yeast life cycle, like that of all

higher organisms, includes a step known as meiosis, where pairs of

chromosomes separate to give new combinations of genetic traits.

People in today’s society use yeast for controlled fermentation of

food and drink; it is also used for baking. In this experiment I will

be attempting to measure the growth of a yeast population and in doing

this I will have to carry out certain methods to succeed. Below is a

diagram on a yeast cells with arrows showing the parts of the yeast

cell:

[IMAGE]

Equipment/ Apparatus:

· 250cm³ Beaker

· Measuring cylinder to measure 50cm³

· A Cuvette

· A Colorimeter

· Sticky Labels

· A Suspension of Yeast

· Glucose Solution

· [IMAGE]Pipette

Risk Assessment:

This experiment is not that much dangerous so not much precaution is

really needed, there are not dangerous chemicals, no hazardous gases

etc. Below I have written the things you must look out for when

carrying out this experiment.

* You will be handling many glass equipment when doing this

experiment such as beakers and measuring cylinders, you must be

extremely careful not to drop or smash the glass in any way or

form whatsoever, this could result in the small shards of glass

cutting your skin or may even come in contact with important parts

of your body such as your eyes.

* Something else that is important when taking part in the

experiment is making sure that the colorimeter does not get in

contact with any liquids, this is because the colorimeter is an

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