"Human Utilization of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 2

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"Human Utilization of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 2

The concept of fermentation:

A process in which bacteria and fungi decompose organic matter and produce a small amount of energy and other substances under anaerobic conditions.

Think about it?

If no sugar is added to the bottle or if the bottle is stored in the refrigerator at low temperature after adding sugar, will the above phenomenon still occur? Why?

Won't. Because yeast needs organic matter and suitable temperature to live.

Why are the bread or steamed buns we eat in daily life soft and porous?

The carbon dioxide gas produced by the yeast will form many small holes in the dough, making the steamed buns or bread rise and become soft.

Why don’t the bread or steamed buns taste like alcohol?

The alcohol produced by yeast fermentation evaporates during the steaming and baking process.

Make liqueur

What is the function of distiller’s yeast? What are the main organisms that cause fermentation in distiller’s yeast? Is this the only organism that plays a role in making wine? What role does glutinous rice play in the wine making process?

Decompose organic matter during the wine making process to produce alcohol

Yeast does not provide organic matter

What is the function of steaming over high heat? Which step is equivalent to the culture of bacteria and fungi?

Sterilization High temperature sterilization

What is the purpose of rinsing steamed rice with cold water? Which step is equivalent to the culture of bacteria and fungi? Is it okay to shower with cool, not boiling water?

Cool to prevent the yeast from being scalded to death. Cooling is not possible.

Bacteria, fungi and disease prevention

What are antibiotics?

Some fungi produce substances that kill certain disease-causing bacteria.

There was a lot of discussion:

1. What are antibiotics? Besides penicillin, what other antibiotics do you know? Tell me which bacteria they mainly kill or inhibit?

Fungi can produce substances that kill certain disease-causing bacteria. These substances are called antibiotics. Commonly used antibiotics mainly kill or inhibit bacteria such as Staphylococcus aureus, pneumococcus, Streptococcus aureus, Helicobacter pylori, and Escherichia coli.

2. Nowadays, many experts urge not to abuse antibiotics. Do you know why?

There are certain side effects, such as drug resistance, allergic reactions, secondary infections, etc.

practise:

1. The production of fermented food is inseparable from ( ) and ( )

2. Some fungi can produce substances that kill certain disease-causing bacteria. These substances are called ( )

3. Long-term use of antibiotics will cause bacteria to develop ( )

Multiple choice questions:

1. The organisms used to make yogurt are mainly ( )

A. Acetic acid bacteria B. Yeast

C. Lactic acid bacteria D. Aspergillus

2. Which of the following statements about bacteria and fungi is correct ( )

A. Most bacteria and fungi are harmful to humans, while a few are beneficial to humans.

B. Bacteria and fungi are harmful to humans

C. Bacteria and fungi are both beneficial to humans

D. Most bacteria and fungi are beneficial to humans, while a few are harmful to humans.

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Update Time: 2024-11-18

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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