Biology

Cellular respiration extracts energy from glucose through glycolysis, the Krebs cycle, and oxidative phosphorylation, producing 30-32 ATP per glucose. This study note covers the equation, the three stages, aerobic vs anaerobic respiration, and how the whole sequence mirrors photosynthesis.

Mitosis is the process by which one parent cell divides into two genetically identical daughter cells. This study note covers the five phases (prophase, metaphase, anaphase, telophase, cytokinesis) with a labeled diagram, the role of the mitotic spindle, how mitosis differs from meiosis, and why uncontrolled mitosis is the central problem in cancer biology.

Mitochondria are the energy-producing organelles in nearly every eukaryotic cell. This study note covers their structure (outer membrane, inner membrane folded into cristae, matrix), how they produce ATP via the electron transport chain and oxidative phosphorylation, mitochondrial DNA, the endosymbiotic theory, and the human diseases linked to mitochondrial dysfunction.

Photosynthesis is how plants, algae, and cyanobacteria turn sunlight, water, and carbon dioxide into glucose and oxygen. This study note covers the equation, the two stages (light reactions and Calvin cycle), the role of chlorophyll, the photosystems, factors that affect the rate, and the differences between C3, C4, and CAM plants.

Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed in the process. They’re essential for digestion, metabolism, DNA replication, and virtually every biological process. This guide covers enzyme structure, classification, kinetics, inhibition, and regulation, providing a clear reference for biology and biochemistry students.

Nucleic acids, specifically DNA and RNA, carry the genetic information that defines every living organism. Understanding their structure, function, and replication is fundamental to molecular biology. This guide covers nucleic acid structure, base pairing, DNA replication, RNA types, gene expression, and the central dogma of molecular biology for science students.

Lipids are the diverse group of biomolecules that include fats, oils, waxes, steroids, and phospholipids. They serve critical roles in energy storage, cell membrane structure, insulation, and hormone production. This reference covers lipid classification, structure, properties, and biological functions, providing a comprehensive overview for biology and chemistry students.

Proteins are the molecular machines of life, performing virtually every function in living cells. From enzymes and antibodies to structural components and signaling molecules, proteins are extraordinarily diverse. This guide covers protein structure from primary to quaternary levels, amino acid building blocks, protein synthesis, denaturation, and key biological functions.

Carbohydrates are the body’s primary energy source and one of the four major biomolecules. From simple sugars like glucose and fructose to complex polysaccharides like starch and cellulose, carbohydrates serve diverse biological functions. This reference covers carbohydrate structure, classification, metabolism, and their essential role in living organisms.