# Introduction of biology

May 20th, 2015
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Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy.[1] Modern biology is a vast and eclectic field, composed of many branches and subdisciplines. However, despite the broad

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NAME: NOR FATIHAH BINTI AHMADCLASS: M12HTITLE: YEAST CELLS AND HAEMOCYTOMETERRESEARCH QUESTION: How does the number of yeast cells per cm3 primary squares affected by the degree of dilutions of yeast suspension granted that the temperature of the surrounding, magnification of objective lens of microscope, the volume of distilled water used for dilution (9ml), the volume of yeast suspension used for each dilution (1ml) and the type of yeast are used are constant?HYPOTHESIS:As the degree of dilutions of yeast suspension increases, the number of yeast cells in cm3 decreases.VARIABLES:Independent: The degree of dilutions of yeast suspension (standard yeast suspension - 1[no dilution], dilution)Dependent: The number of yeast cells in 0.4 mm3 primary squaresConstant:1. The temperature of the surrounding2. Magnification of objective lens of microscope (10x)3. The volume of distilled water used for dilution (9ml) 4. The volume of yeast suspension used for each dilution (1ml) 5. The type of yeastMETHOD OF CONTROLLING VARIABLES:Controlled variablesMethod of controlling1. Independent: The degree of dilutions of yeast suspensioni) For standard yeast suspension, there is no dilution performed.ii) Use different test tubes for each dilution and add 9 ml of distilled water to 1 ml of yeast suspension obtained from the previous test tube for all 4 dilutions.2. Dependent: The number of yeast cells per mm3i) Calculate the number of yeast cells in all of the

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