Macromolecules - Week 3

Cheat Sheet Rules

  • Allowed for Test 1

  • Size: 3 by 5 inches (standard notecard)

  • Usage: Both sides allowed

  • Identification: Must include your name

  • Notes: Handwritten only (no photocopies)

Molecule Size

  • A molecule of oil is extremely small: 1/500 billionth of an inch or approximately 1.6 nm.

  • Historical Insight: In 1773, Benjamin Franklin noted that 1 teaspoon of oil could cover about ½ acre of water.

Atomic Force Microscopy (AFM)

  • Non-contact atomic force microscope (nc-AFM) yields better images of molecules compared to scanning tunneling microscopy (STM).

  • nc-AFM images resemble classical molecular structure diagrams more closely.

The Chemistry of Life - Key Elements

  • Main Elements: Hydrogen, Oxygen, Nitrogen, Carbon, Phosphorus

Metabonomics

  • A field aimed at identifying patterns and changes in metabolic pathways, as demonstrated by metabolic pathways chart designed by Donald E. Nicholson.

Objectives and Key Concepts

  • Understand the saying: "You are what you eat".

  • Define organic molecules and the impact of functional groups on their functions.

  • Living organisms comprise mainly 4 types of macromolecules:

    1. Carbohydrates

    2. Lipids

    3. Nucleic acids

    4. Proteins

  • Synonymous concepts are Monomers and Polymers: building blocks and how they connect.

  • Critical focus on Protein structure and function, denaturation and conditions leading to it.

Vocabulary

  • Key terms include:

    • Amino acid, ATP, Cellulose, DNA, RNA

    • Functional groups (Hydroxyl, Carbonyl, Carboxyl, etc.)

    • Protein, Enzyme, Polysaccharide, Monosaccharide.

Organic Chemistry Basics

  • Organic Molecules: Primarily consist of Carbon, forming 4 covalent bonds.

  • Big Six: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur.

Organic Molecule Structure and Function

  • Hydrocarbons consist only of C and H.

  • Functional groups are important for defining the properties of organic compounds.

  • Key Functional Groups determine molecule characteristics, e.g., the methyl group is hydrophobic.

Major Macromolecules

  1. Carbohydrates (Polysaccharides, Monosaccharides)

  • Building Blocks: Monosaccharides (e.g., Glucose C₆H₁₂O₆)

  • Complexity increases with dehydration synthesis and hydrolysis reactions.

  1. Lipids (Triglycerides, Phospholipids)

  • Building Blocks: Glycerol + Fatty Acid Chains.

  1. Proteins

  • Building Blocks: 20 different amino acids.

  • Structure depends on the amino acid sequence, resulting in primary to quaternary configurations.

  1. Nucleic Acids (DNA, RNA)

  • Building Blocks: Nucleotides (A, T, G, C in DNA and A, U, G, C in RNA).

Functions of Macromolecules

  • Carbohydrates: Immediate energy source

  • Lipids: Long-term energy storage

  • Proteins: Functional roles in metabolism and structure

  • Nucleic Acids: Genetic information storage and transfer.

What Happens Upon Digestion?

  • Carbohydrates: Broken down into simple sugars (hydrolysis reactions).

  • Proteins: Breakdown into amino acids that are then used for energy or building blocks.

  • Lipids: Hydrolyzed into fatty acids and glycerol for energy or reconstitution as fats.

  • Nucleic Acids: Generally not analyzed in nutritional information, but they are present and can be sourced from foods.

Protein Structure and Function

  • Primary structure defined by the sequence of amino acids; secondary structure involves hydrogen bonding, leading to alpha-helices and beta-pleated sheets.

  • Function is dependent on structure; denaturation can affect function profoundly, influenced by environmental conditions.

Important Notes on Diet

  • A balanced diet encompassing the four macromolecules is essential for overall health.

  • Essential amino acids, fatty acids (omega-3, omega-6), and the resulting proteins require consideration in dietary choices.

Cooking and Food Digestibility

  • Cooking induces changes leading to complex flavor development and easier digestion, often through the Maillard reaction.

Molecular Studies and Genetics

  • Concept of gene coding for specific proteins and how mutations can alter structures/functions.

Summary

  • You are what you eat; understanding macromolecules will inform healthier dietary choices. Maintain a varied diet rich in all essential macromolecules, with attention to their structure and the implications of cooking.

  • The recommended bread recipe reflects a balance of ingredients contributing to carbohydrates, proteins, and essential nutrients.

Allowed for Test 1

  • Size: 3 by 5 inches (standard notecard) - This size is chosen for portability and to comply with exam guidelines.

  • Usage: Both sides allowed - Students can maximize space by writing on both sides of the notecard.

  • Identification: Must include your name - Personal identification helps to prevent mix-ups during the exam.

  • Notes: Handwritten only (no photocopies) - This rule encourages students to engage with the material deeply as they craft their notes from memory.

Molecule Size

  • A molecule of oil is extremely small, measuring approximately 1/500 billionth of an inch, which equates to about 1.6 nm. This size highlights the molecular complexity found in oils and lipids.

  • Historical Insight: In 1773, Benjamin Franklin noted that 1 teaspoon of oil could cover about ½ acre of water, showcasing the significant dispersive properties of oil molecules and their environmental impact.

Atomic Force Microscopy (AFM)

  • Non-contact atomic force microscopy (nc-AFM) yields better visual representations of molecular structures compared to scanning tunneling microscopy (STM).

  • nc-AFM images closely resemble classical molecular diagrams, allowing for enhanced understanding of molecular arrangements and interactions at atomic levels.

The Chemistry of Life - Key Elements

  • Main Elements: The essential elements that comprise life include Hydrogen (H), Oxygen (O), Nitrogen (N), Carbon (C), and Phosphorus (P) - These elements play crucial roles in forming the basic structures of biological molecules.

Metabonomics

  • A field aimed at identifying patterns and changes within metabolic pathways, emphasizing the implications of metabolism on health and disease. This field is exemplified by the metabolic pathways chart designed by Donald E. Nicholson, mapping the flow and transformation of biomolecules.

Objectives and Key Concepts

  • Understand the saying: "You are what you eat" - This concept underscores the link between dietary choices and health.

  • Define organic molecules and the influence of functional groups on their molecular functions and reactivity in biological contexts.

  • Living organisms primarily consist of four types of macromolecules, essential for life:

    • 2. Carbohydrates: Serve as energy sources and structural components.

    • 4. Lipids: Function in energy storage and membrane structure.

    • 6. Nucleic acids: Carry genetic information.

    • 8. Proteins: Perform a vast array of functions including catalysis and structural integrity.

  • Synonymous concepts are Monomers and Polymers, emphasizing the building blocks of life and how these building blocks concatenate to form complex structures.

  • Focus on Protein structure and function, including the processes of denaturation and the environmental conditions that lead to alterations in protein functionality.

Vocabulary

Key terms include:

  • Amino acid: The building blocks of proteins.

  • ATP (Adenosine Triphosphate): The primary energy carrier in cells.

  • Cellulose: A polysaccharide that forms the structural component of plant cell walls.

  • DNA (Deoxyribonucleic Acid): The molecule that carries genetic information.

  • RNA (Ribonucleic Acid): Involved in protein synthesis and gene regulation.

Functional groups essential in organic chemistry include Hydroxyl, Carbonyl, Carboxyl, and others, which significantly affect the chemical properties of molecules.

Major Macromolecules

  • 2. Carbohydrates (Polysaccharides, Monosaccharides):

    • Building Blocks: Monosaccharides like Glucose (C₆H₁₂O₆) are the simplest form.

    • Carbohydrates increase in complexity through dehydration synthesis, forming polysaccharides and releasing water molecules, a common reaction in biological processes.

  • 2. Lipids (Triglycerides, Phospholipids):

    • Building Blocks: Composed of glycerol and fatty acid chains, critical for energy storage and cellular structure. Lipids exhibit hydrophobic properties, affecting their biological roles, particularly in forming cell membranes.

  • 2. Proteins:

    • Building Blocks: Comprised of 20 different amino acids, proteins are critical to numerous functions in organisms.

    • The structure varies from primary (amino acid sequence) to quaternary (the complex of multiple polypeptide chains) and influences function significantly.

  • 2. Nucleic Acids (DNA, RNA):

    • Building Blocks: Nucleotides (comprising A, T, G, and C in DNA and A, U, G, and C in RNA) store and transmit genetic information, crucial for inheritance and cellular functions.

Functions of Macromolecules

  • Carbohydrates: Serve as an immediate source of energy and are pivotal in metabolic pathways.

  • Lipids: Provide long-term energy storage and structural integrity in membranes and serve as signaling molecules.

  • Proteins: Function in metabolic reactions (enzymes), structural roles, and defense mechanisms (antibodies).

  • Nucleic Acids: Store, transmit, and express genetic information.

What Happens Upon Digestion?

  • Carbohydrates: Undergo hydrolysis reactions to break down into simple sugars, facilitating their immediate utilization for energy.

  • Proteins: Are broken down into amino acids, which can be utilized for energy or utilized in synthesizing new proteins within the body.

  • Lipids: Are hydrolyzed into fatty acids and glycerol, which can be used for energy production or reassembly into fats for storage.

  • Nucleic Acids: Although generally not included in nutritional information, they are present in foods and can be digested, contributing to dietary DNA and RNA.

Protein Structure and Function

  • The primary structure of proteins is dictated by the sequence of amino acids, while the secondary structure results from hydrogen bonding, leading to structures such as alpha-helices and beta-pleated sheets.

  • The function of a protein is intrinsically linked to its structure; denaturation, caused by factors such as temperature and pH changes, can dramatically impair its functionality.

Important Notes on Diet

  • A balanced diet comprising all four macromolecules is vital for optimal health and sustenance.

  • Consideration must be given to essential nutrients, such as essential amino acids from proteins, and fatty acids (omega-3 and omega-6) in dietary choices to maintain physiological integrity.

Cooking and Food Digestibility

  • Cooking induces chemical changes that enhance flavor development and ease of digestion, often mediated by processes such as the Maillard reaction, which contributes to the browning and flavor complexity of cooked foods.

Molecular Studies and Genetics

  • The concept of gene coding for specific proteins underpins molecular biology, emphasizing how mutations can alter protein structures and hence their functions, potentially leading to various effects on health.

Summary

  • The phrase "You are what you eat" reinforces the importance of understanding macromolecules in making informed dietary choices.

  • Maintaining a diverse and balanced diet rich in all essential macromolecules, while considering the implications of cooking on nutrient availability and food structure, is crucial for overall health and well-being.

  • The recommended bread recipe highlights a balance of ingredients that provide carbohydrates, proteins, and essential nutrients for a healthy diet.