🌱 CARBOHIDRATOS | Moléculas orgánicas | CURSO UNAM | Monosacáridos, disacáridos y polisacáridos

Introduction to Organic Biomolecules

Overview of Biomolecules

• The session introduces the topic of organic biomolecules, specifically focusing on their significance in living organisms.

• Biomolecules are defined as macromolecules that constitute living beings, emphasizing their role in life processes.

Classification of Biomolecules

• Biomolecules are categorized into two groups: organic and inorganic.

• Organic biomolecules include carbohydrates, lipids, proteins, vitamins, and nucleic acids.

• Inorganic biomolecules consist of water, mineral salts, gases, and electrolytes.

Understanding Organic Biomolecules

Characteristics of Organic Molecules

• Organic molecules are primarily composed of carbon; this is a defining characteristic that distinguishes them from inorganic molecules.

• Bioelements refer to essential chemical elements found in living organisms. Key bioelements include carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), and sulfur (S).

Memorization Tip for Bioelements

• A mnemonic "CHOMPS" can help remember the key bioelements: Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur.

Carbohydrates: An Essential Class of Biomolecule

Composition and Names

• Carbohydrates are organic biomolecules made up of carbon, hydrogen, and oxygen. They may also be referred to as carbohydrates or sugars.

Forms of Carbohydrates

• Carbohydrates exist in three forms:

• Sugars

• Starch

• Fiber

Functionality of Carbohydrates

• The primary function of carbohydrates is to serve as a short-term energy source for the body due to their rapid absorption into the bloodstream.

Classification of Carbohydrates

Types Based on Structure

• Carbohydrates are classified into three categories based on their structure:

• Monosaccharides: Simple sugars consisting of one sugar unit.

• Disaccharides: Composed of two monosaccharide units.

Understanding Carbohydrates: Monosaccharides, Disaccharides, and Polysaccharides

Monosaccharides

• Monosaccharides are the monomers of carbohydrates, meaning they are the smallest units that make up carbohydrates.

• The five key monosaccharides to memorize are glucose, fructose, galactose, ribose, and deoxyribose.

• Glucose is highlighted as the primary energy source for living beings; its molecular formula is crucial for exams.

• In exam questions regarding human energy sources, responses may require specifying "monosaccharides" instead of just "carbohydrates."

• Fructose is known as natural sugar found in fruits; galactose is associated with dairy products like milk and yogurt.

Ribose and Deoxyribose

• Ribose and deoxyribose are simple sugars found in RNA and DNA structures respectively; their names reflect their association with genetic material.

• Deoxyribose is part of DNA (deoxyribonucleic acid), while ribose is part of RNA (ribonucleic acid).

Disaccharides

• Disaccharides consist of two monosaccharide units linked together through a glycosidic bond.

• The three main disaccharides discussed are sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (glucose + glucose).

• Sucrose forms from a glycosidic bond between glucose and fructose; this bond type is essential to remember for exams.

Lactose and Maltose

• Lactose results from the union of glucose with galactose via a glycosidic bond; it’s important to note this connection for understanding dairy sugars.

• Maltase consists of two glucose molecules bonded together; remembering this formation helps clarify carbohydrate structures.

Polysaccharides

• Polysaccharides are complex carbohydrates made up of many simple sugars linked by glycosidic bonds.

• Key polysaccharides include cellulose (structural function), starch (energy storage in plants), and glycogen (energy storage in animals).

Understanding Carbohydrates: Structure and Function

The Role of Cellulose in Plant Structure

• La pared celular, que protege a los órganos de las plantas, está compuesta principalmente por celulosa. Esto hace que la celulosa sea un polisacárido con función estructural, esencial para la creación de esta estructura.

Starch as an Energy Reserve

• El almidón es el polisacárido energético más abundante en las plantas y se considera su reserva energética más importante. Es crucial diferenciar entre fuente y reserva; la fuente principal de energía es la luz solar.

Glycogen in Animal Cells

• El glucógeno también es un polisacárido de reserva energética, pero se encuentra en células animales. A diferencia del almidón en plantas, el glucógeno actúa como el carbohidrato de reserva de energía en animales.

Storage and Utilization of Glucose

• El glucógeno se almacena principalmente en el hígado y los músculos. Cuando consumimos carbohidratos, nuestro cuerpo absorbe solo la glucosa necesaria; el exceso se convierte en glucógeno para almacenamiento.

Summary of Carbohydrate Types