Biotechnology

Summary

Biotechnology involves using living organisms or their products for practical purposes, such as in medicine, agriculture, and industry. It includes processes like anaerobic respiration in yeast for biofuels and bread-making, enzyme use in fruit juice production and washing powders, and large-scale production of antibiotics like penicillin using fermenters.

• Anaerobic Respiration — a process where yeast converts sugars into ethanol and carbon dioxide without oxygen.
  Example: Used in biofuel production and bread-making.
• Pectinase — an enzyme that breaks down pectin in fruit cell walls.
  Example: Used to increase juice yield and clarity in fruit juice production.
• Biological Washing Powders — detergents containing enzymes that break down organic stains.
  Example: Effective at lower temperatures to clean clothes.
• Lactase — an enzyme that breaks down lactose in milk.
  Example: Used to produce lactose-free milk.
• Penicillin — an antibiotic produced by the Penicillium mould.
  Example: Used to treat bacterial infections like pneumonia.

Exam Tips

Key Definitions to Remember

• Anaerobic Respiration: Process of energy production in the absence of oxygen.
• Pectinase: Enzyme that breaks down pectin in plant cell walls.
• Lactase: Enzyme that breaks down lactose into glucose and galactose.
• Fermenter: A vessel used to grow microorganisms under controlled conditions.

Common Confusions

• Confusing aerobic and anaerobic respiration.
• Misunderstanding the role of enzymes in biological washing powders.

Typical Exam Questions

• What is the role of yeast in bread-making?
  Yeast respires anaerobically, producing carbon dioxide that makes the dough rise.
• How does pectinase improve fruit juice production?
  Pectinase breaks down pectin, releasing more juice and making it clearer.
• Why is penicillin produced in fermenters?
  Fermenters allow controlled conditions for large-scale production.

What Examiners Usually Test

• Understanding of enzyme functions in different biotechnological processes.
• Ability to explain the conditions necessary for fermentation.