15 – To Investigate Factors Affecting the Growth of Microorganisms (LC 2027) (Leaving Cert Biology): Flashcards
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Practise the cards
13 cards from this deck
Two microorganisms studied in this investigation
Two microorganisms studied in this investigation
Bacteria and yeast
Yeast is classified as
Yeast is classified as
A single-celled fungus
Waste products of yeast
Waste products of yeast
Alcohol (ethanol) and carbon dioxide
Definition of asepsis
Definition of asepsis
Absence of disease-causing organisms (pathogens)
Definition of sterile
Definition of sterile
Complete absence of all microorganisms
What turbidity indicates
What turbidity indicates
Yeast growth - more yeast cells make solution cloudier
What a colorimeter measures
What a colorimeter measures
Light absorbance
Greater light absorbance means
Greater light absorbance means
More turbid solution and greater number of yeast cells
Three pH levels tested in investigation
Three pH levels tested in investigation
pH 4 (acidic), pH 7 (neutral), pH 10 (alkaline)
Example of sterile technique
Example of sterile technique
Flame the neck of all flasks before and after using them
Control in yeast growth investigation
Control in yeast growth investigation
Repeat investigation without adding any yeast
Temperature conditions to test yeast growth
Temperature conditions to test yeast growth
0°C, 40°C and 60°C
Industrial uses of microorganisms
Industrial uses of microorganisms
Antibiotics, vaccines, enzymes, hormones, anti-cancer drugs