biomolecules- building blocks of organisms carbon compounds in cells
TRANSCRIPT
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BIOMOLECULES- Building BLOCKS OF ORGANISMS
Carbon Compounds in Cells
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Organic Compounds
• Organic compounds consists of carbon and one or more additional elements covalently bonded to one another
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Biomolecules
• Those molecules that make up living things
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Importance of Carbon• Carbon has the ability to covalently bond to
at as many of four other atoms.
• Carbon has the ability to rotate freely around a single covalent bond
• As a result carbon has the ability to form many varied structures
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Hydrocarbons
• Organic compounds that contain carbon and hydrogen
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Functional Groups
• Atoms or groups of atoms that are attached to carbon backbones, that convey distinct properties, such as solubility and chemical reactivity.
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3 Types of functional groups
1. Hydroxyl group - OH
2. Carboxyl group - COOH
3. Amines - NH2
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FUNCTIONAL GROUPS
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How Cells Use Organic Compounds
1. Biosynthesis Reactions - two molecules are joined together to form a larger molecule. Dehydration synthesis
2. Hydrolysis - a molecule is broken down into two smaller molecules as a result of the addition of water
3. Enzymes - a special class of proteins that speed and initiate all chemical reactions in cells
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Important Biological Compounds
1. Carbohydrates2. Lipids3. Proteins4. Nucleic Acids5. Vitamins6. Minerals
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Carbohydrates
• Composed of carbon, hydrogen, and oxygen
• In a 1:2:1 ratio of C:H:O• Functional groups present include
Hydroxyl groups
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Function of Carbohydrates in Cells
1.The breakdown of carbohydrates in our cells are the major source of energy for the cell.
2.Major structural component of plant cells
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Classification of Carbohydrates
• Carbohydrates are classified according to the number of sugar molecules that make them up
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3 Types of Carbohydrates1. Monosaccharides
2. Disaccharides
3. Polysaccharides
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Monosaccharides
• Carbohydrates`that consist of only a single sugar unit
• include glucose, fructose, galactose• These monosaccharides serve as the building
blocks for much larger carbohydrates.• Glucose is the major source of cellular energy in
cells
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Disaccharides• Composed of 2 monosaccharides
• cells can make disaccharides by joining two monosaccharides by dehydration synthesis.
• Ex. Glucose + fructose = sucrose
• Glucose + galactose = lactose
• Energy in 8 hrs-hydrolysis
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HYDROLYSIS
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Polysaccharides• Composed of 3 or more
monosaccharides
• made by way of biosynthesis of cells
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Polysaccharides
• 1. Starch - hundreds of thousands of glucose molecules
• made by plants to store energy for future use• easily hydrolized into individual glucose
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Polysaccharides• 2. Cellulose - form cell walls in plant cells
• - also called fiber or ruffage• - indigestible by humans
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Types of Polysaccharides
• 3. Glycogen - made in animal cells• - made for the purpose of short term energy
storage
• stored in liver and muscles
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Types of Polysaccharides
• 4. Chitin
• - a specialized polysaccharide that has nitrogen attached to it
• - forms exoskeleton of arthropods
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Lipids• Lipids are nonpolar and
do not dissolve in water• composed of carbon,
hydrogen, and oxygen• contain the carboxyl
functional group
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Key Components of Lipids
• Fatty acids are key components of many lipids
• unsaturated fatty acids are liquid at room temperature - carbon chains have double bonds
• saturated fatty acids are solid at room temperature and carbon chains contain only single bonds
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Function of Lipids1.Storage of energy in animals
• animal cells will convert excess carbohydrates into lipids to be stored for later use
2. Key component in cell membranes-phospholipid
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Function of Lipids3. Cushion for delicate organs
4. Carriers for vitamins A, D, E, K
5. Serve as the raw materials for the production of hormones
6. Insulation against the cold
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Types of Lipids1.Triglycerides
• formed by the union of 3 fatty acids and an alcohol called glycerol
• those composed of saturated fatty acids are called fats and are made in plants
• those that are composed of unsaturated fatty acids are called oils and are found in oils
• excess carbohydrates in the body are converted to triglycerides until the energy is needed.
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Types of Lipids2.Phospholipids
• composed of glycerol and fatty acids as well as phosphate groups
• are a major component of cell membranes
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Types of Lipids
• 5. Waxes
• composed of very long chains of fatty acids
• serve as waterproof coating for plant leaves, animal fur, and feathers
• 4. Sterols
• serve as building blocks for hormones
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Proteins
• Composed of carbon, hydrogen, oxygen, and nitrogen
• contain the carboxyl group and the amine group
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Key Components of Proteins
• Proteins are composed of smaller units called amino acids
• there are 20 different types of amino acids
• the average protein is about 200 A.A. long
• A.A acids can combine in millions of different ways to form millions of proteins
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Function of Proteins
• Serve as the raw materials for the building of new cells and tissues
• Help in disease fighting-antigens
• Serve as transport agents in the body-hemoglobin
• Help to speed and initiate chemical reactions (enzymes)
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Protein Shape and Function
• Every protein made by the cell has its own distinctive shape
• it is the shape of the protein that helps to determine its function
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PRIMARY PROTEINS
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SECONDARY PROTEIN
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TERTIARY PROTEIN• ENZYMES
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QUATERNARY PROTEIN
• HEMOGLOBIN
• CHLOROPHYLL
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Enzymes - Special Proteins
• All reactions that take place in our cells are initiated and sped up as a result of a SPECIFIC enzyme.
• All reactions require enzymes or they will not occur or occur much to slowly
• Enzymes are catalysts (see glossary)
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Enzyme’s effects on Activation Energy
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Enzymes and Environment
• High temperatures or changes in pH can cause an enzyme to lose its normal 3-D shape ( denaturation )
• this denaturation causes the enzyme to lose its normal functioning
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Nucleic Acids
• Composed of building blocks called nucleotides
• 2 main types– deoxyribonucleic acid (D.N.A)– ribonucleic acid ( R.N.A)
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