Carbon and the Molecular Diversity of Life

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1 Chapter 4 Carbon and the Molecular Diversity of Life PowerPoint Lectures for Biology, Seventh Edition Neil Campbell and Jane Reece Lectures by Chris Romero

2 Overview: Carbon The Backbone of Biological Molecules Although cells are 70 95% water, the rest consists mostly of carbon-based compounds Carbon is unparalleled in its ability to form large, complex, and diverse molecules Proteins, DNA, carbohydrates, and other molecules that distinguish living matter are all composed of carbon compounds

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4 Concept 4.1: Organic chemistry is the study of carbon compounds Organic compounds range from simple molecules to colossal ones Most organic compounds contain hydrogen atoms in addition to carbon atoms Vitalism, the idea that organic compounds arise only in organisms, was disproved when chemists synthesized the compounds Mechanism is the view that all natural phenomena are governed by physical and chemical laws

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6 Concept 4.2: Carbon atoms can form diverse molecules by bonding to four other atoms Electron configuration is the key to an atom s characteristics Electron configuration determines the kinds and number of bonds an atom will form with other atoms

7 The Formation of Bonds with Carbon With four valence electrons, carbon can form four covalent bonds with a variety of atoms This tetravalence makes large, complex molecules possible

8 In molecules with multiple carbons, each carbon bonded to four other atoms has a tetrahedral shape However, when two carbon atoms are joined by a double bond, the molecule has a flat shape

9 LE 4-3 Molecular Formula Structural Formula Ball-and-Stick Model Space-Filling Model Methane Ethane Ethene (ethylene)

10 The electron configuration of carbon gives it covalent compatibility with many different elements The valences of carbon and its most frequent partners (hydrogen, oxygen, and nitrogen) are the building code that governs the architecture of living molecules

11 LE 4-4 Hydrogen Oxygen Nitrogen Carbon (valence = 1) (valence = 2) (valence = 3) (valence = 4)

12 Molecular Diversity Arising from Carbon Skeleton Variation Carbon chains form the skeletons of most organic molecules Carbon chains vary in length and shape Animation: Carbon Skeletons

13 LE 4-5 Length Ethane Propane Branching Butane 2-methylpropane (commonly called isobutane) 1-Butene Double bonds 2-Butene Cyclohexane Rings Benzene

14 Hydrocarbons Hydrocarbons are organic molecules consisting of only carbon and hydrogen Many organic molecules, such as fats, have hydrocarbon components Hydrocarbons can undergo reactions that release a large amount of energy

15 LE 4-6 Fat droplets (stained red) A fat molecule Mammalian adipose cells 100 µm

16 Isomers Isomers are compounds with the same molecular formula but different structures and properties: Structural isomers have different covalent arrangements of their atoms Geometric isomers have the same covalent arrangements but differ in spatial arrangements Enantiomers are isomers that are mirror images of each other Animation: Isomers

17 LE 4-7 Structural isomers differ in covalent partners, as shown in this example of two isomers of pentane. cis isomer: The two Xs are on the same side. trans isomer: The two Xs are on opposite sides. Geometric isomers differ in arrangement about a double bond. In these diagrams, X represents an atom or group of atoms attached to a double-bonded carbon. L isomer D isomer Enantiomers differ in spatial arrangement around an asymmetric carbon, resulting in molecules that are mirror images, like left and right hands. The two isomers are designated the L and D isomers from the Latin for left and right (levo and dextro). Enantiomers cannot be superimposed on each other.

18 Enantiomers are important in the pharmaceutical industry Two enantiomers of a drug may have different effects Differing effects of enantiomers demonstrate that organisms are sensitive to even subtle variations in molecules Animation: L-DopaL

19 LE 4-8 L-Dopa (effective against Parkinson s disease) D-Dopa (biologically Inactive)

20 Concept 4.3: Functional groups are the parts of molecules involved in chemical reactions Distinctive properties of organic molecules depend not only on the carbon skeleton but also on the molecular components attached to it Certain groups of atoms are often attached to skeletons of organic molecules

21 The Functional Groups Most Important in the Chemistry of Life Functional groups are the components of organic molecules that are most commonly involved in chemical reactions The number and arrangement of functional groups give each molecule its unique properties

22 LE 4-9 Estradiol Female lion Testosterone Male lion

23 The six functional groups that are most important in the chemistry of life: Hydroxyl group Carbonyl group Carboxyl group Amino group Sulfhydryl group Phosphate group

24 LE 4-10aa STRUCTURE (may be written HO ) Ethanol, the alcohol present in alcoholic beverages NAME OF COMPOUNDS FUNCTIONAL PROPERTIES Alcohols (their specific names usually end in -ol) Is polar as a result of the electronegative oxygen atom drawing electrons toward itself. Attracts water molecules, helping dissolve organic compounds such as sugars (see Figure 5.3).

25 LE 4-10ab Acetone, the simplest ketone STRUCTURE EXAMPLE Acetone, the simplest ketone NAME OF COMPOUNDS Ketones if the carbonyl group is within a carbon skeleton Aldehydes if the carbonyl group is at the end of the carbon skeleton Propanal, an aldehyde FUNCTIONAL PROPERTIES A ketone and an aldehyde may be structural isomers with different properties, as is the case for acetone and propanal.

26 LE 4-10ac STRUCTURE EXAMPLE Acetic acid, which gives vinegar its sour taste NAME OF COMPOUNDS Carboxylic acids, or organic acids FUNCTIONAL PROPERTIES Has acidic properties because it is a source of hydrogen ions. The covalent bond between oxygen and hydrogen is so polar that hydrogen ions (H + ) tend to dissociate reversibly; for example, Acetic acid Acetate ion In cells, found in the ionic form, which is called a carboxylate group.

27 LE 4-10ba STRUCTURE EXAMPLE Glycine Because it also has a carboxyl group, glycine is both an amine and a carboxylic acid; compounds with both groups are called amino acids. NAME OF COMPOUNDS Amine FUNCTIONAL PROPERTIES Acts as a base; can pick up a proton from the surrounding solution: (nonionized) (ionized) Ionized, with a charge of 1+, under cellular conditions

28 LE 4-10bb STRUCTURE EXAMPLE (may be written HS ) Ethanethiol NAME OF COMPOUNDS Thiols FUNCTIONAL PROPERTIES Two sulfhydryl groups can interact to help stabilize protein structure (see Figure 5.20).

29 LE 4-10bc STRUCTURE EXAMPLE Glycerol phosphate NAME OF COMPOUNDS Organic phosphates FUNCTIONAL PROPERTIES Makes the molecule of which it is a part an anion (negatively charged ion). Can transfer energy between organic molecules.

30 ATP: An Important Source of Energy for Cellular Processes One phosphate molecule, adenosine triphosphate (ATP), is the primary energy-transferring molecule in the cell ATP consists of an organic molecule called adenosine attached to a string of three phosphate groups

31 The Chemical Elements of Life: A Review The versatility of carbon makes possible the great diversity of organic molecules Variation at the molecular level lies at the foundation of all biological diversity

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