Topic 2022 2023 2024 2025 Immunity, pathogens…

Your body has different ways to protect itself from pathogens, which are disease-causing agents like viruses and bacteria. These protective mechanisms fall into two main categories: innate and adaptive immunity.

Photosynthesis and cellular respiration are critical biological processes that manage energy flow in ecosystems. They are interdependent, creating a continuous cycle of energy and matter.

Overall Equation:
6CO₂ (carbon dioxide) + 6H₂O (water) + Light Energy → C₆H₁₂O₆ (glucose) + 6O₂ (oxygen)

Aerobic Cellular Respiration (with oxygen):
This is the most efficient form of respiration, yielding a large amount of ATP. It occurs in three main stages:

2. Sympatric Speciation
   - Occurs without geographical separation. It can be driven by behavioral changes, habitat preferences, or polyploidy (especially in plants).
   - Example: Cichlid fish in African lakes where different feeding habits led to reproductive isolation.

Primate and human evolution is a fascinating area that combines several key biological concepts to explain how life, especially our own species, has changed over millions of years. It's not just about bones and fossils; it's about understanding the mechanisms that drive these changes and the evidence we use to piece together the story.

• DNA: This is the primary genetic material in most organisms. It forms a double helix structure, carrying the instructions for building and maintaining an organism. DNA's structure allows it to be accurately replicated and passed from one generation to the next, ensuring the continuity of life.
• RNA: This molecule plays several roles in expressing the genetic information stored in DNA. Different types of RNA include messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA), all crucial for protein synthesis.

Scientific investigation in VCE science isn't just about memorizing facts; it's about actively doing science. You'll engage in various methodologies to build essential key science skills and see how knowledge, theory, and practice are linked. This means you'll not only understand biological concepts but also how that understanding changes over time with new evidence.

Your notes mention DNA Technologies, including CRISPR, PCR and electrophoresis. Let's focus on PCR, since your source material specifically details its steps.

PCR, or Polymerase Chain Reaction, is a technique used to amplify a specific segment of double-stranded DNA. This means it makes many, many copies of a target DNA sequence. The enzyme required for amplification acts on DNA.