BIOLOGY. Chapter 3 BIOLOGICAL MACROMOLECULES
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1 BIOLOGY Chapter 3 BIOLOGICAL MACROMOLECULES
2 Figure 5.1
3 Large Biological Molecule Terms 4 classes of bio. molecules Carbohydrates (sugars) Proteins Nucleic acids Lipids Monomers (subunits): single-part Building blocks for macromolecules Polymers: many-parts Composed of many monomers Covalently bonded Figure 3.1
4 Hydrolysis Dehydration synthesis Sugars Hydrolysis Add H 2 O Break bonds Catabolic Digestion Energy Energy Dehydration Synthesis Remove H 2 O Form bonds Polymer formation Anabolic animation Carbohydrate Figure 2.13
5 Figure 5.2 (a) Dehydration reaction: synthesizing a polymer Short polymer Unlinked monomer Dehydration removes a water molecule, forming a new bond Longer polymer (b) Hydrolysis: breaking down a polymer Hydrolysis adds a water molecule, breaking a bond
6 Figure 3.2, 3.3 (a) Dehydration reaction: synthesizing a polymer Short polymer Unlinked monomer Dehydration removes a water molecule, forming a new bond Longer polymer
7 Figure 5.2b (b) Hydrolysis: breaking down a polymer Hydrolysis adds a water molecule, breaking a bond
8 Figure 3.4 Carbohydrates Fuel Building material Monomers = Monosaccharides Aldoses (Aldehyde Sugars) Ketoses (Ketone Sugars) Trioses: 3-carbon sugars (C 3 H 6 O 3 ) Glyceraldehyde Dihydroxyacetone Pentoses: 5-carbon sugars (C 5 H 10 O 5 ) Ribose Ribulose Hexoses: 6-carbon sugars (C 6 H 12 O 6 ) Glucose Galactose Fructose
9 Figure 3.4 Functional Groups Aldose (Aldehyde Sugar) Ketose (Ketone Sugar) Trioses: 3-carbon sugars (C 3 H 6 O 3 ) Glyceraldehyde Dihydroxyacetone
10 Figure (a) Linear and ring forms (b) Abbreviated ring structure
11 Figure 3.7, 3.8 Carbohydrates Disaccharides 1 4 glycosidic 1 linkage 4 Glucose Glucose Maltose (a) Dehydration reaction in the synthesis of maltose 1 2 glycosidic 1 linkage 2 Glucose Fructose Sucrose (b) Dehydration reaction in the synthesis of sucrose
12 Figure 3.9 Chloroplast Starch granules Polysaccharides 1) Storage Forms Amylopectin 1 m (a) Starch (amylose/amylopectin): a plant polysaccharide Amylose Mitochondria Glycogen granules (b) Glycogen: 0.5 m an animal polysaccharide Glycogen Where stored? Relate this to negative feedback & low blood sugar.
13 Figure 5.7a Polysaccharides alpha vs beta glucose Glucose Glucose (a) and glucose ring structures
14 Figure 5.7b Polysaccharides alpha vs beta glucose arrangement 1 4 (b) Starch: 1 4 linkage of glucose monomers 1 4 (c) Cellulose: 1 4 linkage of glucose monomers
15 Figure 3.10 Cell wall Cellulose microfibrils in a plant cell wall Polysaccharides 2) Structural Forms Microfibril 10 m 0.5 m Cellulose molecules Glucose monomer insoluble fiber
16 Which polysaccharide has the greatest number of branches? a) cellulose b) chitin c) amylose d) amylopectin e) glycogen
17 Fig. 5-9
18 Why are human enzymes that digest starch unable to digest cellulose? a) Cellulose is made of amino-containing sugars that cannot be metabolized. b) Cellulose contains L-glucose instead of D-glucose; starchdigesting enzymes are specific for polymers of D-glucose. c) Cellulose has beta-glycosidic linkages; starch-digesting enzymes cleave only alpha-glycosidic linkages. d) Cellulose has beta-galactoside linkages that only bacterial beta-galactosidases can cleave. e) Cellulose fibers are covalently cross-linked; starch-digesting enzymes cannot cleave these cross-links.
19 Figure 3.11 Polysaccharides 2) Structural Forms The structure of the chitin monomer Chitin forms the exoskeleton of arthropods. Chitin is used to make a strong and flexible surgical thread that decomposes after the wound or incision heals.
20 Subunits If actively growing cells are fed 14 C-labeled glucose, what macromolecules will become radioactive first? a) proteins b) starch c) nucleic acids d) fatty acids
21 Figure 3.13 Lipids Fatty acid (in this case, palmitic acid) Glycerol (a) One of three dehydration reactions in the synthesis of a fat Ester linkage (b) Fat molecule (triacylglycerol)
22 Figure 5.10a Fatty acid (in this case, palmitic acid) Glycerol (a) One of three dehydration reactions in the synthesis of a fat
23 Figure 5.10b Ester linkage (b) Fat molecule (triacylglycerol)
24 Figure 3.14 Stearic acid is a common saturated fatty acid.
25 Figure 3.15 Oleic acid is a common unsaturated fatty acid.
26 Figure 3.16 Saturated fatty acids have hydrocarbon chains connected by single bonds only. Unsaturated fatty acids have one or more double bonds. Each double bond may be in a cis or trans configuration. In the cis configuration, both hydrogens are on the same side of the hydrocarbon chain. In the trans configuration, the hydrogens are on opposite sides. A cis double bond causes a kink in the chain.
27 Figure 3.17 Alpha-linolenic acid is an example of an omega-3 fatty acid. It has three cis double bonds and, as a result, a curved shape. For clarity, the carbons are not shown. Each singly bonded carbon has two hydrogens associated with it, also not shown.
28 Figure 5.11 (a) Saturated fat Saturated vs unsaturated fat comparison (b) Unsaturated fat Structural formula of a saturated fat molecule Space-filling model of stearic acid, a saturated fatty acid Structural formula of an unsaturated fat molecule Space-filling model of oleic acid, an unsaturated fatty acid Cis double bond causes bending.
29 Hydrophobic tails Hydrophilic head Figure 3.19 Choline Lipids phospholipid Phosphate Glycerol Fatty acids Hydrophilic head Hydrophobic tails (a) Structural formula (b) Space-filling model (c) Phospholipid symbol
30 Figure 3.20 The phospholipid bilayer is the major component of all cellular membranes.
31 Lipids Compared to tropical fish, arctic fish oils have a) more unsaturated fatty acids. b) more cholesterol. c) fewer unsaturated fatty acids. d) more trans-unsaturated fatty acids. e) more hydrogenated fatty acids.
32 Lipids Steroids cholesterol Figure 3.21
33 Lipid Functions Energy storage Insulation Cushioning organs Prevents water loss Chemical messengers Membranes
34 Lipids All lipids a) are made from glycerol and fatty acids. b) contain nitrogen. c) have low energy content. d) are acidic when mixed with water. e) do not dissolve well in water.
35 Proteins Monomers amino acids Figure 3.22
36 Figure 3.23
37 Dehydration Synthesis Condensation RXN Figure 3.24
38 Figure 5.17 Dehydration Synthesis Condensation RXN Peptide bond New peptide bond forming Side chains Backbone Amino end (N-terminus) Peptide bond Carboxyl end (C-terminus)
39 Figure 3.25 Protein structure Amino acids Primary structure DNA RNA Protein Amino end Primary structure of transthyretin Carboxyl end
40 Figure 3.28 Protein structure Secondary structure Tertiary structure Quaternary structure helix pleated sheet Hydrogen bond strand Hydrogen bond Transthyretin polypeptide Transthyretin protein
41 Figure 5.20c Secondary structure helix pleated sheet Hydrogen bond strand, shown as a flat arrow pointing toward the carboxyl end Hydrogen bond
42 Figure 5.20d Secondary Structure pleated sheet
43 Figure 5.20e Tertiary structure Transthyretin polypeptide
44 Figure 3.29 Tertiary structure Possible bonds 4) Disulfide bridge 1) Hydrogen bond 2) Hydrophobic interactions and 3) van der Waals interactions 5) Ionic bond Polypeptide backbone
45 Figure 5.20b Protein structure Secondary structure Tertiary structure Quaternary structure helix pleated sheet Hydrogen bond strand Hydrogen bond Transthyretin polypeptide Transthyretin protein
46 Quaternary structure Figure 5.20g Transthyretin protein (four identical polypeptides) Collagen Figure 5.20h
47 Quaternary structure Heme Iron subunit subunit subunit subunit Figure 5.20i Hemoglobin
48 Figure 5.19 Sickle-cell Normal Primary Structure Secondary and Tertiary Structures Quaternary Structure Function Red Blood Cell Shape Normal β subunit Normal hemoglobin β β α α Proteins do not associate with one another; each carries oxygen. 5 µm Sickle-cell β subunit Sickle-cell hemoglobin β β α α Proteins aggregate into a fiber; capacity to carry oxygen is reduced. 5 µm
49 Protein Structure The sickle-cell hemoglobin mutation alters what level(s) of protein structure? a) primary b) tertiary c) quarternary d) all of the above e) primary and tertiary structures only
50 Figure 5.22 Denature tu Normal protein Denatured protein Temperature heat ph [Ionic] Solvents
51 Macromolecular Structures and Bonds Ceviche is prepared by marinating fresh raw fish in citrus juice for several hours, until the flesh becomes opaque and firm, as if cooked. How does citrus juice render the seafood safe to eat? a) Acidic ph denatures (unfolds and inactivates) proteins by disrupting their hydrogen bonds. b) Citrus juice denatures proteins by disrupting their ionic bonds. c) Citrus juice contains enzymes that hydrolyze peptide bonds to break apart proteins. d) Citrus juice dissolves cell membranes by disrupting hydrophobic interactions.
52 Figure 5.23 Chaperonin or chaperone proteins Cap Polypeptide Correctly folded protein Hollow cylinder Chaperonin (fully assembled) Steps of Chaperonin Action: 1 An unfolded polypeptide enters the cylinder from one end. 2 The cap attaches, causing the cylinder to change shape in such a way that it creates a hydrophilic environment for the folding of the polypeptide. 3 The cap comes off, and the properly folded protein is released. Misfolded proteins Alzheimer s, Parkinson s, and mad cow disease
53 Figure 5.15a 8 generalized functions of proteins Protein function #1 Enzymatic proteins Function: Selective acceleration of chemical reactions Example: Digestive enzymes catalyze the hydrolysis of bonds in food molecules. Enzyme
54 Figure 5.15b Protein function #2 Storage proteins Function: Storage of amino acids Examples: Casein, the protein of milk, is the major source of amino acids for baby mammals. Plants have storage proteins in their seeds. Ovalbumin is the protein of egg white, used as an amino acid source for the developing embryo. Ovalbumin Amino acids for embryo
55 Figure 5.15c Protein function #3 Hormonal proteins Function: Coordination of an organism s activities Example: Insulin, a hormone secreted by the pancreas, causes other tissues to take up glucose, thus regulating blood sugar concentration High blood sugar Insulin secreted Normal blood sugar
56 Figure 5.15d Protein function #4 Contractile and motor proteins Function: Movement Examples: Motor proteins are responsible for the undulations of cilia and flagella. Actin and myosin proteins are responsible for the contraction of muscles. Actin Myosin Muscle tissue 100 m
57 Figure 5.15e Protein function #5 Defensive proteins Function: Protection against disease Example: Antibodies inactivate and help destroy viruses and bacteria. Antibodies Virus Bacterium
58 Figure 5.15f Protein function #6 Transport proteins Function: Transport of substances Examples: Hemoglobin, the iron-containing protein of vertebrate blood, transports oxygen from the lungs to other parts of the body. Other proteins transport molecules across cell membranes. Transport protein Cell membrane
59 Figure 5.15g Protein function #7 Receptor proteins Function: Response of cell to chemical stimuli Example: Receptors built into the membrane of a nerve cell detect signaling molecules released by other nerve cells. Signaling molecules Receptor protein
60 Figure 5.15h Protein function #8 Structural proteins Function: Support Examples: Keratin is the protein of hair, horns, feathers, and other skin appendages. Insects and spiders use silk fibers to make their cocoons and webs, respectively. Collagen and elastin proteins provide a fibrous framework in animal connective tissues. Collagen Connective tissue 60 m
61 8 Protein Functions 1. Structural 2. Storage 3. Transport 4. Hormonal 5. Receptor 6. Contractile 7. Defense 8. Enzymatic 1. Connective tissue (tendons, ligaments) 2. Albumin, casein 3. Hemoglobin, ion channels, etc 4. Insulin 5. Detects other signals (stimuli) 6. Movement 7. Immune system (antibodies) 8. Increase chemical reactions (Digestion, cellular respiration)
62 Figure 3.31
63 Figure 5.26a 5 end 5 C 3 C Sugar-phosphate backbone Nucleic Acids Nucleotide Nucleoside Nitrogenous base 5 C 1 C 5 C Phosphate group 3 C Sugar (pentose) 3 C (b) Nucleotide 3 end (a) Polynucleotide, or nucleic acid
64 Figure 5.26b Nitrogenous bases Pyrimidines Nitrogenous Bases Cytosine (C) Thymine (T, in DNA) Purines Uracil (U, in RNA) Sugars Adenine (A) Guanine (G) Deoxyribose (in DNA) Ribose (in RNA) (c) Nucleoside components
65 Nucleic Acids Store Genetic Information Structure of DNA (deoxyribonucleic acid) Double stranded (dbl helix) Nucleotides contain Deoxyribose (sugar) Nitrogenous bases» Adenine» Guanine» Cytosine» Thymine Pairing» Adenine - Thymine» Guanine - Cytosine Base pair Phosphate Sugar Nucleotide
66 Figure 5.27 Base pair rules 5 3 Sugar-phosphate backbones Hydrogen bonds Base pair joined by hydrogen bonding 3 (a) DNA 5 Base pair joined by hydrogen bonding (b) Transfer RNA
67 Nucleic Acids Store Genetic Information Structure of RNA (ribonucleic acid) Single stranded Nucleotides contain Ribose Nitrogenous bases» Adenine» Guanine» Cytosine» Uracil
68 RNA and DNA How does RNA differ from DNA? a) DNA encodes hereditary information; RNA does not. b) DNA forms duplexes; RNA does not. c) DNA contains thymine; RNA contains uracil. d) all of the above
69 Nucleic Acids Figure DNA Transcription DNA RNA 1 Synthesis of mrna mrna NUCLEUS CYTOPLASM Translation RNA Protein 2 Movement of mrna into cytoplasm mrna Ribosome 3 Synthesis of protein Polypeptide Amino acids
70 Nucleic acid functions? DNA: instructions for making proteins via RNA Information storage Information transfer RNA: instructions for making proteins Protein synthesis DNA RNA Proteins Proteins: direct most of life s processes Transfer of chemical energy
71 Figure 5.UN02
72 Figure 5.UN02a
73 Figure 5.UN02b
Short polymer. Dehydration removes a water molecule, forming a new bond. Longer polymer (a) Dehydration reaction in the synthesis of a polymer
HO 1 2 3 H HO H Short polymer Dehydration removes a water molecule, forming a new bond Unlinked monomer H 2 O HO 1 2 3 4 H Longer polymer (a) Dehydration reaction in the synthesis of a polymer HO 1 2 3
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