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Chapter 11 The Chemistry of Living Things
Preview
Section 1 Elements in Living Things
Section 2 Compounds of Living Things
Concept Map
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Section 1 Elements in Living ThingsChapter 11
Bellringer
Make a list of materials that contain carbon.
Write your list in your Science Journal.
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Section 1 Elements in Living ThingsChapter 11
What You Will Learn
• Carbon is a unique element because it can form long chains as well as bond with other elements.
• Living organisms are made of molecules that consist largely of carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur.
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Section 1 Elements in Living ThingsChapter 11
The Bonding of Carbon Atoms
• Carbon has a central role in the chemistry of living organisms because it can form long chains with other carbon atoms and because it can bond with atoms of other elements to form many different compounds.
• Each carbon atom has four valence electrons. So, each carbon atom can make a total of four bonds.
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Section 1 Elements in Living ThingsChapter 11
The Bonding of Carbon Atoms, continued
• Carbon-based molecules can come in many different shapes, or backbones.
• Three kinds of carbon backbones are the straight chain, the branched chain, and the ring.
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The Chemistry of Living ThingsChapter 11
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Section 1 Elements in Living ThingsChapter 11
The Bonding of Carbon Atoms, continued
• A covalently bonded compound that contains carbon is called an organic compound.
• Atoms of carbon most often form four separate single bonds with other atoms.
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Section 1 Elements in Living ThingsChapter 11
The Bonding of Carbon Atoms, continued
• A single bond is a covalent bond made up of one pair of shared electrons.
• Carbon atoms can also form two covalent bonds, called a double bond, and three bonds, called a triple bond.
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The Chemistry of Living ThingsChapter 11
Organic Compound
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Section 1 Elements in Living ThingsChapter 11
Other Elements in Living Organisms
• Living organisms are made of compounds that are composed mostly of the elements carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur.
• Today, many kinds of organic compounds are manufactured, such as vitamins, hormones, and other supplements.
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The Chemistry of Living ThingsChapter 11
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Section 2 Compounds of Living ThingsChapter 11
Bellringer
Make a list of foods that contain carbohydrates. Then, use your list to describe what carbohydrates are made of.
Write your responses in your Science Journal.
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Section 2 Compounds of Living ThingsChapter 11
What You Will Learn
• Living organisms depend on large compounds, such as carbohydrates, lipids, proteins, and nucleic acids.
• Living organisms depend on many smaller compounds such as water and salt.
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Section 2 Compounds of Living ThingsChapter 11
Carbohydrates
• Biochemicals are large organic compounds that living things make and use.
• Biochemicals that are composed of sugar molecules bonded together are called carbohydrates.
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Section 2 Compounds of Living ThingsChapter 11
Carbohydrates, continued
• A complex carbohydrate can be a long-chain polymer. A polymer is a chain of repeating units.
• Complex carbohydrates may be made up of a chain of thousands of simple sugars.
• Living things use carbohydrates mostly as a source of energy.
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The Chemistry of Living ThingsChapter 11
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Section 2 Compounds of Living ThingsChapter 11
Lipids
• Lipids are biochemicals that do not dissolve in water. Fats, oils, and waxes are lipids.
• Lipids usually have very long chains of carbon atoms.
• Lipids store energy and make up cell membranes.
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The Chemistry of Living ThingsChapter 11
Types of Lipids
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Section 2 Compounds of Living ThingsChapter 11
Proteins
• Proteins are biochemicals that are made of much smaller molecules called amino acids. Most proteins are made of very long chains of amino acids.
• There are 20 different amino acids that can combine in any order to form proteins in living things.
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Section 2 Compounds of Living ThingsChapter 11
Proteins, continued
• Protein is needed to build and repair body structures and to regulate processes in the body.
• Hemoglobin is an important protein found in red blood cells that helps carry oxygen to all of the cells of the body.
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The Chemistry of Living ThingsChapter 11
Proteins
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Section 2 Compounds of Living ThingsChapter 11
Nucleic Acids
• The largest molecules made by living organisms are nucleic acids. Nucleic acids are biochemicals made up of nucleotides.
• Nucleic acids are sometimes called the blueprints of life because they carry all of the information needed for a cell to make all of its proteins.
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Section 2 Compounds of Living ThingsChapter 11
Nucleic Acids, continued
• There are two kinds of nucleic acids: DNA and RNA.
• DNA is the genetic material of a cell.
• The four kinds of nucleotides found in DNA are Adenine, Thymine, Guanine, and Cytosine.
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The Chemistry of Living ThingsChapter 11
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Section 2 Compounds of Living ThingsChapter 11
Other Important Compounds
• No living thing on Earth can survive without water. Water regulates temperature, helps transport substances, and provides lubrication.
• Salt plays an important role in nerve cells by helping conduct signals throughout the body.
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Chapter 11 The Chemistry of Living Things
Use the terms below to complete the concept map on the next slide.
organic compounds
carbohydrates
lipids
proteins
nucleic acids
Concept Map
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The Chemistry of Living ThingsChapter 11
Concept Map
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The Chemistry of Living ThingsChapter 11
Concept Map