뒤로General Biology Key Concepts
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The basic chemical elements essential for life include carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur.
Water is a polar molecule that acts as a solvent, participates in chemical reactions, and helps regulate temperature in biological systems.
Organic chemistry studies carbon-containing compounds, especially those found in living organisms like carbohydrates, lipids, proteins, and nucleic acids.
Proteins function as enzymes, structural components, signaling molecules, and transporters in cells.
Lipids are hydrophobic molecules that store energy, form cell membranes, and act as signaling molecules.
Biological membranes are primarily composed of a phospholipid bilayer with embedded proteins, controlling substance passage and cell communication.
Metabolism is the sum of all chemical reactions in an organism that maintain life, including catabolic and anabolic pathways.
Thermodynamics explains energy transformations in biological systems, including concepts of energy conservation and .
Enzymes act as biological catalysts that speed up chemical reactions without being consumed.
Enzyme specificity ensures that enzymes catalyze only specific substrates, increasing efficiency and regulation of metabolic pathways.
Enzymes stabilize the transition state of a reaction, reducing the energy needed to start the reaction.
Carbon's ability to form four covalent bonds allows it to build diverse and complex organic molecules essential for life.
The four major classes are carbohydrates, lipids, proteins, and nucleic acids.
The basic unit of proteins is the amino acid, linked by peptide bonds to form polypeptides.
Membranes provide a selective barrier that regulates the entry and exit of substances and facilitates communication.
Catabolic pathways break down molecules to release energy, while anabolic pathways build complex molecules using energy.
Energy cannot be created or destroyed, only transformed; organisms convert energy from one form to another.
Every energy transfer increases the entropy (disorder) of the universe, affecting biological energy efficiency.
Enzymes increase reaction rates by lowering the activation energy required for the reaction to proceed.
Membranes create distinct cellular compartments allowing specialized environments and processes within cells.