1 Organic C Organic C hemistry hemistry Ch. 3 - Organic Molecules Ch. 3 - Organic Molecules Inorganic Inorganic – Chemistry of elements other than – Chemistry of elements other than carbon carbon Organic Organic – Carbon-based chemistry – Carbon-based chemistry Usually associated Usually associated living systems living systems Often associated with Often associated with nonliving matter nonliving matter Often quite large, with Often quite large, with many atoms many atoms Always with Always with few atoms few atoms Always Always covalent bonding covalent bonding Usually Usually ionic bonding ionic bonding Always contain Always contain carbon and hydrogen carbon and hydrogen Usually with Usually with + & - ions + & - ions Organic Organic Inorganic Inorganic p. 36 text
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Organic Chemistry 1 Ch. 3 - Organic Molecules Inorganic – Chemistry of elements other than carbon Organic – Carbon-based chemistry Usually associated living.
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InorganicInorganic – Chemistry of elements other than carbon – Chemistry of elements other than carbonOrganicOrganic – Carbon-based chemistry – Carbon-based chemistry
Usually associatedUsually associatedliving systemsliving systems
Often associated with Often associated with nonliving matternonliving matter
Often quite large, withOften quite large, withmany atomsmany atoms
Always withAlways withfew atomsfew atoms
AlwaysAlwayscovalent bondingcovalent bonding
UsuallyUsuallyionic bondingionic bonding
Always containAlways containcarbon and hydrogencarbon and hydrogen
Usually withUsually with+ & - ions+ & - ions
OrganicOrganicInorganicInorganic
p. 36 text
2Carbohydrates as structural materials
3Organic ChOrganic Chemistryemistry
Carbon AtomCarbon Atom
Carbon atoms:Carbon atoms:
Contain a total of 6 electronsContain a total of 6 electrons
Only four electrons in the outer shellOnly four electrons in the outer shell
Very diverse as one atom can bond with up to Very diverse as one atom can bond with up to four other atomsfour other atoms
Often bonds with other carbon atoms to make Often bonds with other carbon atoms to make hydrocarbonshydrocarbons
Can produce long carbon chains like octaneCan produce long carbon chains like octane
Can produce ring forms like cyclohexaneCan produce ring forms like cyclohexane
4Octane & Cyclohexane
5Organic ChOrganic Chemistryemistry
Functional Groups and IsomersFunctional Groups and Isomers
Functional groupsFunctional groups::
Specific combinations of bonded atomsSpecific combinations of bonded atoms
Attached as a group to other moleculesAttached as a group to other molecules
Always react in the same manner, regardless of Always react in the same manner, regardless of where attachedwhere attached
Determine activity and polarity of large organic Determine activity and polarity of large organic moleculesmolecules
Many functional groups, but only a few are of Many functional groups, but only a few are of major biological importancemajor biological importance
6Organic ChOrganic Chemistryemistry
Polar; some sugarsPolar; some sugarsExample: AcetoneExample: Acetone
Polar, forms H-bonds; some sugarsPolar, forms H-bonds; some sugarsand amino acids Example: Ethanoland amino acids Example: EthanolR OH
RHCO
R RCO
ROHCO
RHN H
R SH
Biologically ImportantBiologically ImportantFunctional Groups (Fig. 3.2)Functional Groups (Fig. 3.2)
IsomersIsomers - organic molecules that have: - organic molecules that have: Identical molecular formulas, butIdentical molecular formulas, butDiffering internal arrangement of atomsDiffering internal arrangement of atoms
8Organic ChOrganic Chemistryemistry
MacromoleculesMacromolecules
Some molecules called macromolecules because of Some molecules called macromolecules because of their large sizetheir large size
Usually consist of many repeating unitsUsually consist of many repeating units Resulting molecule is a Resulting molecule is a polymerpolymer (many parts) (many parts) Repeating units are called Repeating units are called monomersmonomers
Dehydration and HydrolysisDehydration and Hydrolysis
Dehydration (condensation)Dehydration (condensation) - Removal of - Removal of water moleculewater moleculeConnects monomers together to make Connects monomers together to make polymerspolymers
Glucose monomers condense to make starchGlucose monomers condense to make starch
HydrolysisHydrolysis - Addition of water molecule - Addition of water moleculeDisassembles polymers into monomer partsDisassembles polymers into monomer partsDigestion of starch into glucose monomersDigestion of starch into glucose monomers
Specific enzymes required for each reactionSpecific enzymes required for each reactionAccelerate reactionAccelerate reactionAre not used in the reactionAre not used in the reaction
11Synthesis and Degradationof Polymers
12Organic ChOrganic ChemistryemistryFour Classes of Organics:Four Classes of Organics:
More polysaccharide examplesMore polysaccharide examplesCelluloseCellulose Long, coiled polymer of glucoseLong, coiled polymer of glucose Structural element for plantsStructural element for plants Indigestible by most animalsIndigestible by most animals
ChitinChitin Polymer of glucosePolymer of glucose Very resistant to wear and digestionVery resistant to wear and digestion Arthropod exoskeletons, cell walls of fungiArthropod exoskeletons, cell walls of fungi
19StarchStructure and
Function
20GlycogenStructure and
Function
21CelluloseStructure and
Function
22Organic ChOrganic ChemistryemistryFour Classes of Organics:Four Classes of Organics:
2 - Lipids2 - Lipids
Insoluble in waterInsoluble in water Long chains of repeating CHLong chains of repeating CH22 units units Renders molecule nonpolarRenders molecule nonpolar
Types of LipidsTypes of Lipids
MedicinesMedicinesComponent of plasma Component of plasma membrane; hormonesmembrane; hormonesSteroidsSteroids
No-stick pan sprayNo-stick pan sprayComponent of plasma Component of plasma membranemembranePhospholipidsPhospholipids
Cooking oilsCooking oilsLong-term energy storage in Long-term energy storage in plants and their seedsplants and their seedsOilsOils
Butter, lardButter, lardLong-term energy storage & Long-term energy storage & thermal insulation in animalsthermal insulation in animalsFatsFats
Human UsesHuman UsesOrganismal UsesOrganismal UsesTypeType
25Organic ChOrganic ChemistryemistryTypes of Lipids:Types of Lipids:
Triglycerides (1)Triglycerides (1)
TriglyceridesTriglycerides (Fats) (Fats)Long-term energy storageLong-term energy storageBackbone of one Backbone of one glycerolglycerol molecule molecule Three fatty acids attached to each glycerol Three fatty acids attached to each glycerol moleculemolecule Long hydrocarbon chainLong hydrocarbon chain
SaturatedSaturated - no double bonds between carbons - no double bonds between carbons UnsaturatedUnsaturated - - 1 double bonds between carbons1 double bonds between carbons
Carboxylic acid at one endCarboxylic acid at one end
26Dehydration Synthesis of Triglyceridefrom Glycerol and Three Fatty Acids
27Organic ChOrganic ChemistryemistryTypes of Lipids:Types of Lipids:
Phospholipids (2)Phospholipids (2)
PhospholipidsPhospholipidsDerived from triglyceridesDerived from triglycerides
GlycerolGlycerol backbone backboneTwo fatty acids attached instead of threeTwo fatty acids attached instead of threeThird fatty acid replaced by Third fatty acid replaced by phosphate groupphosphate group The fatty acids are nonpolar and hydrophobicThe fatty acids are nonpolar and hydrophobic The phosphate group is polar and hydrophilicThe phosphate group is polar and hydrophilic
Molecules self arrange when placed in waterMolecules self arrange when placed in waterPolar Polar phosphate phosphate ““headsheads”” next to water next to waterNonpolar Nonpolar fatty acid fatty acid ““tailstails”” overlap and overlap and exclude waterexclude water
Spontaneously form double layer & a sphereSpontaneously form double layer & a sphere
28Phospholipids Form Membranes
29Organic ChOrganic ChemistryemistryTypes of Lipids:Types of Lipids:
Proteins are polymers of Proteins are polymers of amino acidsamino acidsEach amino acid has a central carbon atom to Each amino acid has a central carbon atom to
which are attachedwhich are attached a hydrogen atom,a hydrogen atom, an an amino groupamino group –NH –NH22,, A carboxylic acid group –COOH,A carboxylic acid group –COOH, and one of 20 different types of –and one of 20 different types of –RR
(remainder) (remainder) groupsgroupsThere are 20 different amino acids that make There are 20 different amino acids that make
up proteinsup proteinsAll of them have basically the same structure All of them have basically the same structure
except for what occurs at the placeholder except for what occurs at the placeholder RR
PrimaryPrimary:: Literally, the sequence of amino acidsLiterally, the sequence of amino acids
SecondarySecondary:: The way the amino acid chain coils or foldsThe way the amino acid chain coils or folds
TertiaryTertiary:: Overall three-dimensional shape of a Overall three-dimensional shape of a
polypeptidepolypeptide
QuaternaryQuaternary:: Consists of more than one polypeptideConsists of more than one polypeptide
38Levels of Protein Organization
39Examples of Fibrous Proteins
40Organic ChOrganic Chemistryemistry
Protein-folding DiseasesProtein-folding Diseases
Assembly of AA’s into protein extremely Assembly of AA’s into protein extremely complexcomplex
Process overseen by “Process overseen by “chaperonechaperone” molecules” molecules
Inhibit incorrect interactions between Inhibit incorrect interactions between RR groups as polypeptide growsgroups as polypeptide grows
Defects in these chaperones can corrupt the Defects in these chaperones can corrupt the tertiary structure of proteinstertiary structure of proteins
Mad cow disease could be due to mis-folded Mad cow disease could be due to mis-folded proteinsproteins
41Organic ChOrganic ChemistryemistryFour Classes of Organics:Four Classes of Organics:
4 -Nucleic Acids4 -Nucleic Acids
Polymers of nucleotidesPolymers of nucleotides
Very specific cell functionsVery specific cell functionsDNADNA ( (deoxyribonucleic aciddeoxyribonucleic acid)) Double-stranded helical spiral (twisted ladder)Double-stranded helical spiral (twisted ladder) Serves as genetic information centerServes as genetic information center In chromosomesIn chromosomes
RNARNA ( (ribonucleic acidribonucleic acid)) Single-strandedSingle-stranded Serves primarily in assembly of proteinsServes primarily in assembly of proteins In nucleus and cytoplasm of cellIn nucleus and cytoplasm of cell
42Organic ChOrganic ChemistryemistryThe Nucleotides ofThe Nucleotides of
Nucleic AcidsNucleic Acids
Three components:Three components:
A phosphate group,A phosphate group,
A pentose sugar (ribose or deoxyribose), andA pentose sugar (ribose or deoxyribose), and
A A nitrogenous basenitrogenous base (4 kinds in DNA, 4 kinds in (4 kinds in DNA, 4 kinds in RNA, 3 common to both)RNA, 3 common to both)
Nucleotide subunits connected end-to-end to Nucleotide subunits connected end-to-end to make nucleic acidmake nucleic acid
Sugar of one connected to the phosphate of Sugar of one connected to the phosphate of the nextthe next
Sugar-phosphate backboneSugar-phosphate backbone
43Nucleotides
44DNA Structure
45RNA Structure
46Organic ChOrganic Chemistryemistry
NoNoYesYesHelixHelix
Interprets genetic info; Interprets genetic info; protein synthesisprotein synthesis
Heredity; cellular Heredity; cellular control centercontrol centerFunctionFunction
Cell nucleus and Cell nucleus and cytoplasmcytoplasm
Chromosomes of cell Chromosomes of cell nucleusnucleusWhereWhere
Comparison of DNA & RNAComparison of DNA & RNA
Table 3.4Table 3.4
Single strandedSingle strandedDouble-stranded; Double-stranded; Pairing across strandsPairing across strandsStrandsStrands
ATP (adenosineATP (adenosine triphosphate) is composed of triphosphate) is composed of adenine, ribose, and three phosphatesadenine, ribose, and three phosphates
In cells, one phosphate bond is hydrolyzed – In cells, one phosphate bond is hydrolyzed – Yields:Yields:
The molecule The molecule ADPADP ( (adenosine diphosphateadenosine diphosphate))
An inorganic phosphate molecule pAn inorganic phosphate molecule pii
EnergyEnergy
Other energy sources used to put ADP and pOther energy sources used to put ADP and p ii back together againback together again