LM Biomolecules

Biomolecules

Learning Objectives

  • Identifying Groups: You should be able to list the four major groups of organic substances in the body and identify the molecular structure of each group.

  • Carbohydrates: You need to discuss the function of carbohydrates, list the three primary types of carbohydrates (monosaccharides, disaccharides, polysaccharides), and provide examples for each type.

  • Lipids: You must describe the different types of lipids, their composition, major functions, and provide examples of each.

  • Proteins: Explain the vital role of both structural and functional proteins in the body, providing clear examples for both categories.

  • Protein Structure: Describe the four hierarchical levels of protein structure (primary, secondary, tertiary, quaternary) and discuss in detail why the specific shape of a protein is crucial for its function.

  • Nucleic Acids: Compare and contrast the structure of DNA and RNA, providing examples of each and outlining their respective roles.

  • ATP: Describe the chemical reaction for energy release from ATP (hydrolysis) and explain the central role of ATP as the energy currency in the cell.

  • Macromolecules: List important examples of combined forms of macromolecules in the body, such as lipoproteins and glycoproteins.

  • Disease Relations: Discuss specific examples of how abnormalities and deficiencies of biomolecules can lead to various diseases.

Organic Molecules

  • Definition: Organic molecules are fundamental compounds in living systems, characterized by containing carbon-to-carbon (C—C) or carbon-to-hydrogen (C—H) bonds. This distinct molecular backbone is what makes them 'organic'.

Categories of Organic Molecules

(EXAM ALERT: Know all four categories and their general roles!)

  1. Carbohydrates: These are commonly known as sugars and starches. They are the body's primary source of quick energy.

    • Types of Carbohydrates:

      • Monosaccharides: These are the simplest form of carbohydrates, consisting of single sugar molecules. They are the building blocks for more complex carbohydrates. Examples: Glucose (blood sugar), Fructose (fruit sugar), Galactose.

      • Disaccharides: Formed by the chemical linkage of two monosaccharides. Example: Sucrose (table sugar = glucose + fructose), Lactose (milk sugar = glucose + galactose), Maltose (malt sugar = glucose + glucose).

      • Polysaccharides: These are long chains (polymers) of many monosaccharides linked together. They serve as energy storage or structural components. Examples: Glycogen (animal starch, stored in liver and muscles), Starch (plant energy storage), Cellulose (plant structural component, fiber).

  2. Lipids: These are water-insoluble (hydrophobic) organic molecules. They are critically important biological compounds with diverse major roles, which include:

    • Energy Source: Provide a highly concentrated and long-term source of energy.

    • Structural Role: Form essential components of cellular structures, notably membranes.

    • Integral Parts of Cell Membranes: Essential in forming the lipid bilayer of cells, which dictates cell permeability.

    • Types of Lipids: Triglycerides (fats and oils), Phospholipids, Steroids, and Prostaglandins. (EXAM ALERT: Differentiate between these types!)

  3. Proteins: These are the most abundant organic compounds in biological systems, performing a vast array of functions. They are complex polymers made up of smaller units called amino acids.

    • Amino Acids:

      • Essential Amino Acids: These are 8-10 amino acids that must be obtained from the diet because the body cannot synthesize them.

      • Nonessential Amino Acids: These can be synthesized by the body from other molecules.

    • Structure: Each amino acid consists of a central carbon atom, an amino group (ext−NH2ext{-NH}_2), a carboxyl group (ext−COOHext{-COOH}), a hydrogen atom, and a unique variable functional group (R group). The R group determines the specific properties of each amino acid.

  4. Nucleic Acids: These are polymers made of repeating units called nucleotides. They are crucial for storing and transmitting genetic information and include DNA and RNA.

Carbohydrates: Detailed Structure and Reactions

  • Structure of Glucose: A six-carbon sugar (hexose). Its chemical formula is $C6H{12}O_6.Inalinearprojection,itlookslike:</p><p>. In a linear projection, it looks like:</p><p>
    H ext{—} C ext{—} O H
    |
    H ext{—} C ext{—} O H
    |
    H ext{—} C ext{—} O H
    |
    H ext{—} C ext{—} O H
    |
    H ext{—} C ext{—} O H
    |
    H ext{—} C ext{—} H O H
    </p><p>(Note:Inaqueoussolutions,glucoseprimarilyexistsinacyclicringstructure.)</p></li><li><p><strong>FormationofSucrose</strong>:Sucroseisadisaccharideformedbya<strong>condensationreaction</strong>(ordehydrationsynthesis)betweenonemoleculeofglucoseandonemoleculeoffructose.Thisreaction<em>releases</em>onemoleculeofwater(</p><p>(Note: In aqueous solutions, glucose primarily exists in a cyclic ring structure.)</p></li><li><p><strong>Formation of Sucrose</strong>: Sucrose is a disaccharide formed by a <strong>condensation reaction</strong> (or dehydration synthesis) between one molecule of glucose and one molecule of fructose. This reaction <em>releases</em> one molecule of water (H_2O).</p><p>).</p><p>
    C6H{12}O6 ext{ (glucose)} + C6H{12}O6 ext{ (fructose)}
    ightarrow C{12}H{22}O{11} ext{ (sucrose)} + H2O
    <br>(EXAMALERT:Understandcondensation/dehydrationsynthesisvs.hydrolysis!)</p></li></ul><h5>Lipids:TypesandFunctions</h5><ul><li><p><strong>Triglycerides(FatsandOils)</strong>:</p><ul><li><p><strong>Composition</strong>:Madeupofone<strong>glycerol</strong>molecule(a3−carbonalcohol)andthree<strong>fattyacid</strong>molecules.Thisiswhytheyarecalled′tri−glycerides′.</p></li><li><p><strong>TypesofFattyAcids</strong>:</p><ul><li><p><strong>SaturatedFattyAcids</strong>:Contain<em>nodoublebonds</em>betweencarbonatomsintheirhydrocarbonchain.Theyaretypicallysolidatroomtemperature(e.g.,Palmiticacid,animalfats).Theyare′saturated′withhydrogenatoms.</p></li><li><p><strong>UnsaturatedFattyAcids</strong>:Contain<em>oneormoredoublebonds</em>betweencarbonatomsintheirhydrocarbonchain.Thesedoublebondsintroduce′kinks′thatpreventtightpacking,makingthemtypicallyliquidatroomtemperature(oils).Examples:Oleicacid(monounsaturated),a−Linolenicacid(polyunsaturated,essentialfattyacid).</p></li></ul></li><li><p><strong>FormationofTriglycerides</strong>:Formedbyacondensationreactionbetweenglycerolandthreefattyacids,releasingthreemoleculesofwater.<br><br>(EXAM ALERT: Understand condensation/dehydration synthesis vs. hydrolysis!)</p></li></ul><h5>Lipids: Types and Functions</h5><ul><li><p><strong>Triglycerides (Fats and Oils)</strong>:</p><ul><li><p><strong>Composition</strong>: Made up of one <strong>glycerol</strong> molecule (a 3-carbon alcohol) and three <strong>fatty acid</strong> molecules. This is why they are called 'tri-glycerides'.</p></li><li><p><strong>Types of Fatty Acids</strong>:</p><ul><li><p><strong>Saturated Fatty Acids</strong>: Contain <em>no double bonds</em> between carbon atoms in their hydrocarbon chain. They are typically solid at room temperature (e.g., Palmitic acid, animal fats). They are 'saturated' with hydrogen atoms.</p></li><li><p><strong>Unsaturated Fatty Acids</strong>: Contain <em>one or more double bonds</em> between carbon atoms in their hydrocarbon chain. These double bonds introduce 'kinks' that prevent tight packing, making them typically liquid at room temperature (oils). Examples: Oleic acid (monounsaturated), a-Linolenic acid (polyunsaturated, essential fatty acid).</p></li></ul></li><li><p><strong>Formation of Triglycerides</strong>: Formed by a condensation reaction between glycerol and three fatty acids, releasing three molecules of water.<br> ext{Glycerol} + 3 ext{ Fatty acids}
    ightarrow ext{Triglycerides} + 3H_2O </p></li></ul></li><li><p><strong>Phospholipids</strong>:(EXAMALERT:Crucialforcellmembranes!)</p><ul><li><p><strong>Composition</strong>:Similartotriglycerides,butonefattyacidisreplacedbya<strong>phosphategroup</strong>attachedtoapolarheadgroup.</p></li><li><p><strong>Structure</strong>:Consistofa<strong>hydrophilic(water−soluble)head</strong>(duetothephosphategroup)andtwo<strong>hydrophobic(fat−soluble)tails</strong>(thefattyacidchains).</p></li><li><p><strong>Function</strong>:Thisamphipathicnatureiskeytotheirroleastheprimarystructuralcomponentsof<strong>cellmembranes</strong>,wheretheyspontaneouslyforma<strong>lipidbilayer</strong>.</p></li></ul></li></ul><h5>SteroidsandProstaglandins:OtherImportantLipids</h5><ul><li><p><strong>Steroids</strong>:Thesearelipidscharacterizedbyadistinctfour−ringcarbonstructure.</p><ul><li><p><strong>Examples</strong>:Cholesterol(aprecursorforothersteroidsandacomponentofcellmembranes),andhormonessuchascortisol(stresshormone)andestrogen/testosterone(sexhormones).</p></li><li><p><strong>Functions</strong>:Involvedinbothstructuralroles(e.g.,cholesterolinmembranesimpartingfluidity)andfunctionalroles(e.g.,hormonesregulatingvariousbodilyprocesses).</p></li></ul></li><li><p><strong>Prostaglandins</strong>:Theseareagroupoffattyacidderivativeswithhormone−likeeffects,oftenproducedlocally.</p><ul><li><p><strong>Functions</strong>:Actaslocalhormonesthathavevariousfunctionsinresponsetostimuli,suchasinflammation,painsignaling,bloodclotting,andregulationofbloodpressure.Theyarereleasedandthenquicklyinactivatedneartheirsiteofaction.</p></li></ul></li></ul><h5>Proteins:Structure,Function,andDenaturation</h5><p>(EXAMALERT:Understandproteinstructurelevelsandtheimpactofdenaturation!)</p><ul><li><p><strong>ProteinStructureLevels</strong>:Thecomplex3Dshapeofaprotein,essentialforitsfunction,isdefinedbyfourhierarchicallevels:</p><ol><li><p><strong>PrimaryStructure</strong>:Thisisthe<em>linearsequence</em>ofaminoacidsinapolypeptidechain,determinedbythegeneticcode.(Thinkofitasthespecificorderoflettersinaword).</p></li><li><p><strong>SecondaryStructure</strong>:Localizedfoldingpatternsthatarisefromhydrogenbondsbetweenthebackboneatomsofthepolypeptide.Commonformsinclude<strong>alphahelices</strong>(acoiledstructure,likeaspring)and<strong>betasheets</strong>(apleated,sheet−likestructure).</p></li><li><p><strong>TertiaryStructure</strong>:Theoverall<strong>3Dconformation</strong>ofa<em>single</em>polypeptidechain.ThislevelisformedbycomplexinteractionsbetweentheRgroups(sidechains)oftheaminoacids,includinghydrogenbonds,ionicbonds,hydrophobicinteractions,anddisulfidebridges.</p></li><li><p><strong>QuaternaryStructure</strong>:Thislevelappliesonlytoproteinscomposedof<em>multiplepolypeptidechains</em>(subunits)thatassembletogethertoformafunctionalprotein.(Example:Hemoglobin,withfoursubunits).</p></li></ol></li><li><p><strong>ImportanceofProteinShape</strong>:Thespecific3Dshape(conformation)ofaproteinisabsolutelycriticalforitsfunction.</p><ul><li><p><strong>StructuralProteins</strong>:Theseprovidesupportandshapetocellsandtissues.Examples:Collagen(foundinconnectivetissue),Keratin(inhairandnails),ActinandMyosin(inmuscle).</p></li><li><p><strong>FunctionalProteins</strong>:Thesecatalyzebiochemicalreactions(enzymes),transportmolecules,provideimmunity,andassistinvariouscellularfunctions.Examples:Enzymes(likeamylase),Antibodies,Hemoglobin(oxygentransport),Insulin(hormone).</p></li></ul></li><li><p><strong>Denaturation</strong>:Thisisaprocesswhereproteins<em>losetheirnatural3Dstructure</em>(secondary,tertiary,andquaternarylevels)duetochangesinenvironmentalconditions.Thislossofshapetypicallyresultsinalossoffunction.(EXAMALERT:CommoncausesofdenaturationincludeextremepHchanges,hightemperatures,andcertainchemicals.)</p></li></ul><h5>NucleicAcids:DNAvs.RNA</h5><p>(EXAMALERT:BeabletocompareandcontrastDNAandRNA!)</p><ul><li><p><strong>DNA(DeoxyribonucleicAcid)</strong>:</p><ul><li><p><strong>Structure</strong>:Adoublehelixcomposedoftwopolynucleotidestrands.Eachnucleotideconsistsofa<strong>deoxyribosesugar</strong>,a<strong>phosphategroup</strong>,andoneoffournitrogenousbases:</p><ul><li><p><strong>Adenine(A)</strong></p></li><li><p><strong>Thymine(T)</strong></p></li><li><p><strong>Cytosine(C)</strong></p></li><li><p><strong>Guanine(G)</strong></p></li></ul></li><li><p><strong>Basepairing</strong>:SpecificbasepairingrulesarecrucialforDNAstructureandfunction(Chargaff′srules):</p><ul><li><p><strong>Adenine</strong>alwayspairswith<strong>Thymine</strong>(forming2hydrogenbonds).</p></li><li><p><strong>Cytosine</strong>alwayspairswith<strong>Guanine</strong>(forming3hydrogenbonds).</p></li></ul></li><li><p><strong>Function</strong>:Primaryfunctionistostoreandtransmitgeneticinformation.Itcarriestheinstructionsforbuildingandmaintaininganorganism.</p></li></ul></li><li><p><strong>RNA(RibonucleicAcid)</strong>:</p><ul><li><p><strong>Structure</strong>:Typicallyasinglepolynucleotidestrand.Eachnucleotideconsistsofa<strong>ribosesugar</strong>,a<strong>phosphategroup</strong>,andoneoffournitrogenousbases:</p><ul><li><p><strong>Adenine(A)</strong></p></li><li><p><strong>Uracil(U)</strong>(replacesThymineinRNA)</p></li><li><p><strong>Cytosine(C)</strong></p></li><li><p><strong>Guanine(G)</strong></p></li></ul></li><li><p><strong>Function</strong>:Playsmultiplerolesinproteinsynthesisandtheregulationofgeneexpression.TypesincludemessengerRNA(mRNA),transferRNA(tRNA),andribosomalRNA(rRNA).</p></li></ul></li></ul><h5>NucleotidesandTheirFunctions(BeyondDNA/RNA)</h5><ul><li><p><strong>ATP(AdenosineTriphosphate)</strong>:(EXAMALERT:UnderstandATP′sroleasenergycurrency!)</p><ul><li><p><strong>Theprimaryenergycurrencyofcells</strong>.Itstoresandtransfersenergyforcellularprocesses.</p></li><li><p><strong>Structure</strong>:Composedofanadeninebase,aribosesugar,andthreephosphategroups.</p></li><li><p><strong>ReactionforEnergyRelease</strong>:Energyisreleasedwhentheterminalphosphatebondisbrokenviahydrolysis,convertingATPtoADP(AdenosineDiphosphate)andinorganicphosphate(</p></li></ul></li><li><p><strong>Phospholipids</strong>: (EXAM ALERT: Crucial for cell membranes!)</p><ul><li><p><strong>Composition</strong>: Similar to triglycerides, but one fatty acid is replaced by a <strong>phosphate group</strong> attached to a polar head group.</p></li><li><p><strong>Structure</strong>: Consist of a <strong>hydrophilic (water-soluble) head</strong> (due to the phosphate group) and two <strong>hydrophobic (fat-soluble) tails</strong> (the fatty acid chains).</p></li><li><p><strong>Function</strong>: This amphipathic nature is key to their role as the primary structural components of <strong>cell membranes</strong>, where they spontaneously form a <strong>lipid bilayer</strong>.</p></li></ul></li></ul><h5>Steroids and Prostaglandins: Other Important Lipids</h5><ul><li><p><strong>Steroids</strong>: These are lipids characterized by a distinct four-ring carbon structure.</p><ul><li><p><strong>Examples</strong>: Cholesterol (a precursor for other steroids and a component of cell membranes), and hormones such as cortisol (stress hormone) and estrogen/testosterone (sex hormones).</p></li><li><p><strong>Functions</strong>: Involved in both structural roles (e.g., cholesterol in membranes imparting fluidity) and functional roles (e.g., hormones regulating various bodily processes).</p></li></ul></li><li><p><strong>Prostaglandins</strong>: These are a group of fatty acid derivatives with hormone-like effects, often produced locally.</p><ul><li><p><strong>Functions</strong>: Act as local hormones that have various functions in response to stimuli, such as inflammation, pain signaling, blood clotting, and regulation of blood pressure. They are released and then quickly inactivated near their site of action.</p></li></ul></li></ul><h5>Proteins: Structure, Function, and Denaturation</h5><p>(EXAM ALERT: Understand protein structure levels and the impact of denaturation!)</p><ul><li><p><strong>Protein Structure Levels</strong>: The complex 3D shape of a protein, essential for its function, is defined by four hierarchical levels:</p><ol><li><p><strong>Primary Structure</strong>: This is the <em>linear sequence</em> of amino acids in a polypeptide chain, determined by the genetic code. (Think of it as the specific order of letters in a word).</p></li><li><p><strong>Secondary Structure</strong>: Localized folding patterns that arise from hydrogen bonds between the backbone atoms of the polypeptide. Common forms include <strong>alpha helices</strong> (a coiled structure, like a spring) and <strong>beta sheets</strong> (a pleated, sheet-like structure).</p></li><li><p><strong>Tertiary Structure</strong>: The overall <strong>3D conformation</strong> of a <em>single</em> polypeptide chain. This level is formed by complex interactions between the R groups (side chains) of the amino acids, including hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.</p></li><li><p><strong>Quaternary Structure</strong>: This level applies only to proteins composed of <em>multiple polypeptide chains</em> (subunits) that assemble together to form a functional protein. (Example: Hemoglobin, with four subunits).</p></li></ol></li><li><p><strong>Importance of Protein Shape</strong>: The specific 3D shape (conformation) of a protein is absolutely critical for its function.</p><ul><li><p><strong>Structural Proteins</strong>: These provide support and shape to cells and tissues. Examples: Collagen (found in connective tissue), Keratin (in hair and nails), Actin and Myosin (in muscle).</p></li><li><p><strong>Functional Proteins</strong>: These catalyze biochemical reactions (enzymes), transport molecules, provide immunity, and assist in various cellular functions. Examples: Enzymes (like amylase), Antibodies, Hemoglobin (oxygen transport), Insulin (hormone).</p></li></ul></li><li><p><strong>Denaturation</strong>: This is a process where proteins <em>lose their natural 3D structure</em> (secondary, tertiary, and quaternary levels) due to changes in environmental conditions. This loss of shape typically results in a loss of function. (EXAM ALERT: Common causes of denaturation include extreme pH changes, high temperatures, and certain chemicals.)</p></li></ul><h5>Nucleic Acids: DNA vs. RNA</h5><p>(EXAM ALERT: Be able to compare and contrast DNA and RNA!)</p><ul><li><p><strong>DNA (Deoxyribonucleic Acid)</strong>:</p><ul><li><p><strong>Structure</strong>: A double helix composed of two polynucleotide strands. Each nucleotide consists of a <strong>deoxyribose sugar</strong>, a <strong>phosphate group</strong>, and one of four nitrogenous bases:</p><ul><li><p><strong>Adenine (A)</strong></p></li><li><p><strong>Thymine (T)</strong></p></li><li><p><strong>Cytosine (C)</strong></p></li><li><p><strong>Guanine (G)</strong></p></li></ul></li><li><p><strong>Base pairing</strong>: Specific base pairing rules are crucial for DNA structure and function (Chargaff's rules):</p><ul><li><p><strong>Adenine</strong> always pairs with <strong>Thymine</strong> (forming 2 hydrogen bonds).</p></li><li><p><strong>Cytosine</strong> always pairs with <strong>Guanine</strong> (forming 3 hydrogen bonds).</p></li></ul></li><li><p><strong>Function</strong>: Primary function is to store and transmit genetic information. It carries the instructions for building and maintaining an organism.</p></li></ul></li><li><p><strong>RNA (Ribonucleic Acid)</strong>:</p><ul><li><p><strong>Structure</strong>: Typically a single polynucleotide strand. Each nucleotide consists of a <strong>ribose sugar</strong>, a <strong>phosphate group</strong>, and one of four nitrogenous bases:</p><ul><li><p><strong>Adenine (A)</strong></p></li><li><p><strong>Uracil (U)</strong> (replaces Thymine in RNA)</p></li><li><p><strong>Cytosine (C)</strong></p></li><li><p><strong>Guanine (G)</strong></p></li></ul></li><li><p><strong>Function</strong>: Plays multiple roles in protein synthesis and the regulation of gene expression. Types include messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA).</p></li></ul></li></ul><h5>Nucleotides and Their Functions (Beyond DNA/RNA)</h5><ul><li><p><strong>ATP (Adenosine Triphosphate)</strong>: (EXAM ALERT: Understand ATP's role as energy currency!)</p><ul><li><p><strong>The primary energy currency of cells</strong>. It stores and transfers energy for cellular processes.</p></li><li><p><strong>Structure</strong>: Composed of an adenine base, a ribose sugar, and three phosphate groups.</p></li><li><p><strong>Reaction for Energy Release</strong>: Energy is released when the terminal phosphate bond is broken via hydrolysis, converting ATP to ADP (Adenosine Diphosphate) and inorganic phosphate (Pi).). ext{ATP} ightarrow ext{ADP} + Pi + ext{Energy}

  • Role: The energy released from ATP hydrolysis powers nearly all cellular activities, including muscle contraction, active transport, and biosynthesis.

  • NAD+ (Nicotinamide Adenine Dinucleotide) and FAD (Flavin Adenine Dinucleotide):

    • Role: These are crucial coenzymes primarily involved in redox reactions (electron transfer) within cellular respiration and other metabolic pathways. They act as electron carriers, accepting electrons and hydrogen ions to become $NADH and $FADH_2$$ respectively, which then carry energy to the electron transport chain.

    • Combined Forms of Biomolecules (Macromolecules)

    • Lipoproteins: These are complexes of lipids and proteins. Their main function is to transport lipids (like cholesterol and triglycerides) through the watery environment of the blood. Examples: HDL (High-Density Lipoprotein), LDL (Low-Density Lipoprotein).

    • Glycoproteins: Molecules composed of carbohydrates covalently attached to proteins. They play a critical role in cell-cell recognition, cell signaling, and as components of the extracellular matrix. Many receptors on cell surfaces are glycoproteins.

    • Glycolipids: Molecules composed of carbohydrates covalently attached to lipids. Also important in cell recognition and membrane stability.

    Biomolecules and Disease

    (EXAM ALERT: Be prepared to discuss specific examples of biomolecule-related diseases!)

    • Carbohydrate Disorders: Conditions related to abnormal glucose metabolism.

      • Diabetes Mellitus: A chronic condition where the body either doesn't produce enough insulin (Type 1) or can't effectively use the insulin it produces (Type 2), leading to high blood glucose levels.

      • Lactose Intolerance: Deficiency of the enzyme lactase, which is needed to break down lactose (a disaccharide).

    • Lipid Disorders: Abnormalities in lipid metabolism.

      • Hyperlipidemia: High levels of lipids (like cholesterol and triglycerides) in the blood, which can contribute to atherosclerosis (hardening of arteries) and significantly increase the risk of heart disease and stroke.

      • Familial Hypercholesterolemia: A genetic disorder causing very high LDL cholesterol levels from birth.

    • Protein Disorders: Genetic disorders or acquired conditions resulting from abnormal protein structure or function.

      • Sickle Cell Anemia: A genetic blood disorder caused by a single amino acid substitution in the beta-globin chain of hemoglobin, leading to abnormally shaped red blood cells.

      • Cystic Fibrosis: Genetic disorder caused by a mutation in the CFTR protein, affecting chloride ion transport and leading to thick, sticky mucus buildup.

      • Alzheimer's Disease: Involves the accumulation of abnormal protein aggregates (beta-amyloid plaques and tau tangles) in the brain.

    • Nucleic Acid Disorders: Mutations or abnormalities in DNA or RNA leading to genetic diseases.

      • Down Syndrome: A chromosomal disorder caused by an extra copy of chromosome 21.

      • Huntington's Disease: A genetic neurodegenerative disorder caused by an abnormal expansion of a DNA trinucleotide repeat.

      • Cancers: Often result from accumulated mutations in DNA that affect cell growth and division.

    Questions and Further Exploration

    • Reviewing definitions, providing additional examples, and further study of each biomolecule category are highly encouraged for a deeper understanding of their roles in health and disease. Consider how diet impacts the availability of essential biomolecule components.