Worksheet: Biomolecules

Biomolecules are organic compounds found in living organisms, classified into four main categories: carbohydrates, proteins, lipids, and nucleic acids. Carbohydrates serve as energy sources; for example, glucose and starch. Proteins are made of amino acids and perform various functions in the body, such as enzymes and hormones. Lipids include fats and oils, which serve as energy storage. Nucleic acids, such as DNA and RNA, are essential for genetic information storage and transfer.

Proteins have four levels of structure: primary (amino acid sequence), secondary (alpha-helix or beta-pleated sheet), tertiary (overall 3D shape), and quaternary (multiple polypeptide chains). The specific sequence of amino acids determines the protein's shape and function, allowing it to perform various roles in the body, such as catalyzing reactions (enzymes), providing structural support (collagen), and facilitating transport (hemoglobin).

Enzymes are biological catalysts that speed up chemical reactions without being consumed. They lower the activation energy needed for reactions by binding substrates at their active sites, forming an enzyme-substrate complex. This complex stabilizes the transition state, making it easier for the substrate to convert to product. Factors such as temperature, pH, and substrate concentration affect enzyme activity.

Nucleic acids, which include DNA and RNA, are polymers made of nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. DNA is double-stranded, forming a helical structure, and encodes genetic information through sequences of nitrogenous bases (adenine, thymine, cytosine, and guanine). The specific order of these bases determines the genetic code necessary for protein synthesis.

Primary metabolites are compounds essential for normal functioning and development, such as amino acids, carbohydrates, and fatty acids, directly involved in growth. Secondary metabolites, like alkaloids, flavonoids, and terpenes, are not directly involved in growth but play roles in defense, pollination, and other ecological interactions. While primary metabolites are ubiquitous, secondary metabolites can vary widely among species.

Macromolecules are large, complex molecules typically composed of thousands of atoms. They include proteins, nucleic acids, lipids, and carbohydrates. For instance, proteins are formed by chains of amino acids, nucleic acids by nucleotides, carbohydrates by sugar molecules, and lipids by fatty acids and glycerol. Their large size is crucial for their roles in biological processes such as structure, energy storage, and genetic information processing.

Carbohydrates are organic compounds made of carbon, hydrogen, and oxygen, serving primarily as energy sources. They can be classified into monosaccharides (like glucose), disaccharides (such as sucrose), and polysaccharides (like starch and glycogen). Monosaccharides provide immediate energy, disaccharides serve as transport forms, and polysaccharides are used for energy storage and structural integrity in cells.

Lipids are hydrophobic biological molecules that include fats, oils, phospholipids, and steroids. They serve various functions, including energy storage (triglycerides), forming cell membranes (phospholipids), and acting as signaling molecules (steroids). Due to their hydrophobic nature, lipids play a key role in cellular structure and hormone regulation.

Water is a critical biomolecule, constituting a significant portion of cell mass. It serves as a solvent, facilitating biochemical reactions and transportation of molecules. Its polar nature enables it to dissolve ionic compounds and polar substances. Water also plays a role in temperature regulation and is essential for maintaining cell structure and function, making it vital for life.

Fatty acids are carboxylic acids with long hydrocarbon chains and can be saturated (no double bonds) or unsaturated (one or more double bonds). They play critical roles in energy storage, membrane structure (as components of phospholipids), and signaling (as precursors to hormones). The types and proportions of fatty acids in lipids significantly influence their properties and functions.

Primary metabolites, such as amino acids, carbohydrates, and nucleotides, function in growth, metabolism, and reproduction. Secondary metabolites, like alkaloids and flavonoids, have ecological roles or applications in human welfare. Diagram illustrating examples of both categories and their functions.

Both are nucleic acids but differ in pentose sugar (DNA: deoxyribose, RNA: ribose), base composition (DNA: thymine; RNA: uracil), and structure (DNA: double-stranded; RNA: single-stranded). Discuss how these features relate to their functions in genetic coding and expression.

Enzymes catalyze biochemical reactions by lowering activation energy, forming an ES complex. Factors affecting activity include temperature, pH, and substrate concentration. Illustrate with a graph showing enzyme activity against these variables.

Proteins are formed by amino acid chains linked by peptide bonds. The 4 levels of structure define protein function: Primary (sequence), Secondary (alpha helix/beta sheet), Tertiary (3D folding), Quaternary (multiple subunits). Examples include hemoglobin and enzymes.

Saturated fatty acids have no double bonds and are solid at room temperature; unsaturated fatty acids contain one or more double bonds, typically liquid. Discuss dietary implications, linking to heart health.

Carbohydrates serve as energy sources (e.g., glucose, starch for plants, glycogen for animals) and structural components (e.g., cellulose in plant cell walls). Include diagrams of structures.

Water is vital for life due to its solvent properties, temperature regulation, and role in biochemical reactions. Discuss cohesion, adhesion, and its role in metabolic processes.

Macromolecules (proteins, nucleic acids, polysaccharides) have high molecular weight and complex structures, whereas micromolecules (amino acids, fatty acids) are low in mass. Explain their biological roles.

Enzymes are classified into six classes: oxidoreductases, transferases, hydrolases, lyases, isomerases, and ligases. Detail functions and provide examples, such as lactate dehydrogenase (oxidoreductase) and hexokinase (transferase).

Explore applications in genetic engineering, pharmaceuticals, and herbal medicine by manipulating enzymes and biomolecules. Discuss real-world examples like CRISPR technology.

Analyze how primary, secondary, tertiary, and quaternary structures are essential for different protein functions. Discuss what denaturation means and provide examples of factors that lead to denaturation and its effects on protein activity.

Explore the definitions and examples of both types of metabolites. Evaluate potential consequences of shifts in metabolite production on ecosystems, using case studies as evidence.

Discuss the structural differences between DNA and RNA, including sugar type and base pairing. Provide examples of mutation impacts at both genetic and phenotypic levels.

Select an inhibitor, explain its impact on enzyme activity through molecular mechanisms, and assess the broader effects on metabolic pathways, potentially with therapeutic implications.

Discuss water's properties, including polarity, solvent capabilities, and hydrogen bonding. Analyze how these properties facilitate biochemical reactions.

Identify and describe the function of three vitamins. Discuss how deficiencies impact metabolic processes and overall health.

Explore the types of lipids (phospholipids, steroids, triglycerides) and their roles in membrane structure. Analyze factors affecting fluidity, such as saturation and membrane composition.

Examine how the 20 types of amino acids contribute to vast structural possibilities and subsequent functional diversity in proteins. Use examples to illustrate your argument.

Focus on the interaction of macromolecules in processes such as signaling, structure, and metabolism. Discuss specific examples and their implications for cellular health.

Discuss enzyme kinetics principles and the relationship between conditions and enzyme effectiveness. Provide specific examples of enzymes and the consequences of environmental changes.