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292 notes for biology

Coordination, Homeostasis, and Excretion
IGCSE Biology
Your body constantly monitors and adjusts its internal conditions to stay stable, a process called homeostasis, using both your nervous and hormonal systems for coordination. Waste…
Reproduction and Inheritance
IGCSE Biology
Reproduction is how living things make more of themselves, either sexually (two parents) or asexually (one parent). Inheritance is about how characteristics are passed down from pa…
Ecology and Biotechnology
IGCSE Biology
Ecology studies how living things interact with each other and their environment, focusing on energy flow and nutrient cycles within ecosystems. Biotechnology uses living organisms…
Interphase: The Preparatory Stage
GEN BIOLOGY 1 (LESSON 4)
Interphase is the longest stage of the cell cycle where a cell grows, duplicates its DNA, and prepares for division. It's crucial for ensuring each new cell receives a complete set…
G1 Phase: First Growth Period
GEN BIOLOGY 1 (LESSON 4)
The G1 phase is the first and longest part of a cell's interphase, where it grows significantly, makes new organelles, and performs its normal functions. During this phase, the cel…
S Phase: DNA Synthesis
GEN BIOLOGY 1 (LESSON 4)
During the S phase of the cell cycle, a cell duplicates its entire DNA content through a process called DNA replication. This ensures each new daughter cell receives a complete set…
G2 Phase: Second Growth and Preparation for Mitosis
GEN BIOLOGY 1 (LESSON 4)
The G2 phase is the crucial "second growth" stage after DNA replication where the cell prepares for division. It involves synthesizing proteins and organelles, ensuring all necessa…
G0 Phase: Quiescence and Senescence
GEN BIOLOGY 1 (LESSON 4)
The G0 phase is a non-dividing state where cells can temporarily exit the cell cycle (quiescence) or permanently stop dividing (senescence). Quiescent cells can re-enter the cell c…
Introduction to the Cell Cycle
GEN BIOLOGY 1 (LESSON 4)
The cell cycle is the ordered series of events a cell goes through to grow and divide into two new cells. It involves distinct phases like interphase (growth and DNA replication) a…
Cambridge IGCSE History Introductory Concepts
History, geography, biology
Cambridge IGCSE History helps you understand the past by exploring key historical concepts and developing critical thinking skills. You'll study world history mainly in the 19th an…
Core Content Option A: The Nineteenth Century
History, geography, biology
This core content option covers the major historical developments in Europe and the United States from 1848 to 1914, focusing on how modern nation states were formed and expanded.…
Core Content Option B: The Twentieth Century
History, geography, biology
Option B focuses on international relations in the 20th century, exploring major events from 1919 onwards. You'll analyze key historical questions like the fairness of the Treaty o…
Depth Study – Selected Global Conflicts and Crises
History, geography, biology
This topic explores selected major global conflicts and crises, examining their causes, key events, and impacts on the world. You'll dive into various depth studies including the F…
Historical Skills and Evidence Analysis
History, geography, biology
Learning history involves developing key skills like investigation and analysis, understanding core historical concepts, and responsibly using evidence to construct explanations. Y…
The Organism and Its Environment
Human and Social biology
Organisms don't live in isolation; they constantly interact with their environment. Understanding these interactions helps us see how life survives and thrives. We'll look at how l…
Foundations of Biological Psychology
Biology psychology
Biological psychology explores how our biology, especially the brain, influences our thoughts, feelings, and behaviors. It combines psychology and biology to understand the physica…
Bioenergetics: Photosynthesis and Respiration
General Biology
Bioenergetics is how organisms manage energy, primarily through photosynthesis and cellular respiration. Photosynthesis captures light energy to build sugars, while respiration bre…
The Importance of Water
Biology
…acting as a universal solvent and participating in critical biological processes. Its unique properties, like cohesion and high heat capacity, make it perfect for supporting living…
Foundational Sciences & Quantitative Reasoning
biology hl, chemistry sl, math aa sl, spanish b sl, english hl, bm hl
Foundational sciences (Biology, Chemistry) explain the natural world, while Quantitative Reasoning (Math) provides tools to understand and analyze it. Together, they help you make…
Biological Molecules
alevel biology
Biological molecules are the organic chemicals that make up all living things, categorised into carbohydrates, lipids, proteins, and nucleic acids. Their specific structures determ…