Summary
Biotechnology and genetic modification involve manipulating the DNA of organisms to produce desired traits or products.
- Genetic Engineering — the process of altering the DNA of an organism to introduce new traits. Example: Inserting a human gene for insulin into bacteria to produce insulin.
- Restriction Enzymes — enzymes that cut DNA at specific sequences, creating sticky ends. Example: Used to cut DNA for insertion into plasmids.
- Ligase Enzymes — enzymes that join DNA fragments together. Example: Sealing sticky ends between plasmid and human DNA.
- Anaerobic Respiration — a process where organisms produce energy without oxygen, often producing carbon dioxide. Example: Yeast fermentation in bread-making.
- Pectinase — an enzyme that breaks down pectin in fruit, clarifying juice. Example: Used to produce clear fruit juice.
Exam Tips
Key Definitions to Remember
- Genetic Engineering: Altering the DNA of organisms to introduce new traits.
- Restriction Enzymes: Enzymes that cut DNA at specific sequences.
- Ligase Enzymes: Enzymes that join DNA fragments together.
- Anaerobic Respiration: Energy production without oxygen, producing carbon dioxide.
- Pectinase: Enzyme that breaks down pectin to clarify juice.
Common Confusions
- Confusing genetic engineering with artificial selection.
- Misunderstanding the role of restriction enzymes and ligase enzymes.
Typical Exam Questions
- What is genetic engineering? The process of altering the DNA of organisms to introduce new traits.
- How do restriction enzymes work? They cut DNA at specific sequences, creating sticky ends.
- Why is pectinase used in juice production? To break down pectin and clarify the juice.
What Examiners Usually Test
- Understanding of how genetic engineering is used to produce insulin.
- The role of enzymes like restriction enzymes and ligase in DNA manipulation.
- The process and purpose of anaerobic respiration in yeast.