Biochemistry Overview

Key: Green: Definition

Purple: Other important information

Introduction to Biochemistry

Biochemistry is the study of the chemical processes and substances that occur within living organisms. It provides the molecular foundation for understanding anatomy and physiology, focusing on the structure and function of biological molecules.

• Biochemistry bridges biology and chemistry, explaining how molecular interactions underpin life processes.

• Key areas include the study of organic and inorganic compounds, macromolecules, and their roles in cellular function.

Organic vs. Inorganic Compounds

Classification of Chemical Compounds

Chemical compounds in living organisms are classified as either organic or inorganic based on their composition and structure.

• Organic Compounds: Chemicals that contain both carbon (C) and hydrogen (H) atoms. These are the basis of life and include molecules such as carbohydrates, lipids, proteins, and nucleic acids.

• Inorganic Compounds: All other chemicals, typically lacking both carbon and hydrogen together. Examples include water (H2O), carbon dioxide (CO2), oxygen (O2), and salts.

Organic Compounds in Living Organisms

Major Groups of Organic Compounds

There are four major groups of organic compounds essential for life. Each group has unique functions and structural properties.

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

Macromolecules

Monomers and Polymers

Macromolecules are large, complex molecules formed by the polymerization of smaller subunits called monomers.

• Monomer: The basic building block or subunit of a macromolecule.

• Polymer: A large molecule composed of repeated monomer units.

• Each group of organic compounds has its own characteristic monomer and resulting polymer.

Carbohydrates

Structure and Types of Carbohydrates

Carbohydrates are organic molecules composed of carbon, hydrogen, and oxygen, typically in a 1:2:1 ratio. They serve as a primary energy source for cells.

• Monosaccharides: Simple sugars, such as glucose, fructose, and galactose. These are the monomers of carbohydrates.

• Disaccharides: Formed by joining two monosaccharides via a dehydration reaction (removal of water). Example: Sucrose (glucose + fructose).

• Polysaccharides: Long chains of monosaccharides. Examples include starch (energy storage in plants), glycogen (energy storage in animals), and cellulose (structural component in plants).

Structural Isomers of Glucose

Glucose exists in different structural forms, such as α-glucose and β-glucose, which differ in the orientation of the hydroxyl group on carbon 1.

• α-Glucose: Hydroxyl group on carbon 1 is below the plane of the ring.

• β-Glucose: Hydroxyl group on carbon 1 is above the plane of the ring.

Examples of Monosaccharides

• Glucose: Main energy source for cells.

• Fructose: Found in fruits; used for energy.

• Galactose: Component of lactose in milk.

Functions of Carbohydrates

• Provide immediate energy for cellular processes.

• Serve as energy storage (starch in plants, glycogen in animals).

• Form structural components (cellulose in plant cell walls).

General Formula for Monosaccharides

The general formula for monosaccharides is:

where n is typically 3-7.

Comparison Table: Types of Carbohydrates

Additional info:

• These notes cover foundational biochemistry concepts essential for understanding cellular structure and function in anatomy and physiology.

• Further topics such as lipids, proteins, and nucleic acids are implied in the original notes and should be studied for a complete understanding.