1. Most microorganisms are harmless and useful to humans. Yeast and bacteria are microorganisms. Discuss the benefits of using this two microorganisms to produce useful products for humans. [ 10 marks]
Suggested Answer:
Medical Purpose : ( Any 4)
Antibiotic
· Antibiotic are chemicals which either inhibit the growth of or kill other microorganisms, especially disease-causing bacteria
· Example : streptomycin is produced by Streptomycin sp.
· Penicillin is produced by the fungus Penicillium chrysogenum sp.
· The fungus is grown in large fermenters, and the antibiotic produced is then isolated and purified
Immunisation ( 1 mark)
· The vaccine that contains weakened or dead microorganism which stimulates the body to produce antibodies.
Food Processing Industry
Wine ( 2 marks)
· Wine is made by adding yeast to fruit sugar (glucose) from grapes.
· The yeast converts glucose in grapes into alcohol during anaerobic respiration / fermentation
Bread ( 2 marks)
· Bread is made from yeast, flour,sugar and water. The most commonly used species of yeast is Saccharomyces cerevisiae.
· Fermentation by yeast produces ethanol and carbon dioxide. The carbon dioxide causes the dough to rise
Soya Sauce ( 1mark)
· Soya sauce is made from fermented soya beans caused by the action of fungi.
**Or any suitable answer
No comments:
Post a Comment