Monosaccharides Mono = one saccharide = sugar Characteristics of a Monosaccharide Are the simplest sugars Are single ring structures Typically have a chemical formula C 6 H 12 O 6
Glucose Glucose, fructose, and galactose are all monosaccharides with the chemical formula C 6 H 12 O 6. Isomer – substances that have the same chemical formula, but a different structural formula
Deoxyribose (C 5 H 10 O 4 ) and Ribose (C 5 H 10 O 5 ) are not true isomers as they do not have the exact same chemical or structural formulas. Can you find the difference in the structural formulas of deoxyribose and ribose? How do you suppose deoxyribose got it’s name?
Disaccharides are the result of the connection of two monosaccharides by dehydration synthesis.
C 6 H 12 O 6 + C 6 H 12 O 6 = C 12 H 22 O 11 + H 2 O C 12 H 22 O 11 + C 12 H 22 O 11 = C 24 H 42 O 21 + H 2 O C 24 H 42 O 21 + C 24 H 42 O 21 = C 48 H 82 O 41 + H 2 O
Polysaccharides are the result of connection of many monosaccharides by dehydration synthesis. The general formula for polysaccharides can also be represented as (C 6 H 10 O 5 ) n where 40≤n≤3000 Examples of polysaccharides are starch (plants/energy), glycogen (animals/energy), cellulose (plants/fiber), and chitin (animals/fungi/protection)
Starches are glucose polymers. Amylose starches consists of a linear chain of several hundred glucose molecules and Amylopectin starches are a branched molecule made of several thousand glucose units (every chain 24–30 glucose unit). Starches are insoluble in water. They can be digested by hydrolysis, catalyzed by enzymes called amylases. Humans and other animals have amylases, so they can digest starches. Potato, rice, wheat, and corn are major sources of starch in the human diet. The formation of starches are the way that plants store glucose. Starchesglucoseamylases
Glycogen is a polysaccharide that is found in animals and is composed of a branched chain of glucose residues. It is stored in liver and muscles. Glycogen
The structural component of plants are formed primarily from cellulose. Wood is largely cellulose and lignin, while paper and cotton are nearly pure cellulose. Cellulose is a polymer made with repeated glucose units bonded together. Humans and many other animals lack an enzyme to break these linkages, so they do not digest cellulose. Certain animals can digest cellulose, because bacteria possessing the enzyme are present in their gut. The classic example is the termite.polymer
Chitin is one of many naturally occurring polymers. It is one of the most abundant natural materials in the world. Over time it is bio-degradable in the natural environment. Its breakdown may be catalyzed by enzymes called chitinases, secreted by microorganisms such as bacteria and fungi, and produced by some plants. Some of these microorganisms have receptors to simple sugars from the decomposition of chitin. If chitin is detected, they then produce enzymes to digest it by cleaving the glycosidic bonds in order to convert it to simple sugars and ammonia. Chitinpolymersenzymeschitinases
Providing energy and regulation of blood glucose Sparing the use of proteins for energy Breakdown of fatty acids and preventing ketosis (use of cellular glycogen for energy) Biological recognition processes Flavor and Sweeteners Dietary fiber
Proteins contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur
Proteins are composed of amino acids linked together by dehydration synthesis
Required for building and repair of body tissues (including muscle) Enzymes, hormones, and many immune molecules are proteins Essential body processes such as water balancing, nutrient transport, and muscle contractions require protein to function. Protein is a source of energy. Protein helps keep skin, hair, and nails healthy. Protein, like most other essential nutrients, is absolutely crucial for overall good health
The best-known role of proteins in the cell is as enzymes, which catalyze chemical reactions. Enzymes are usually highly specific and accelerate only one or a few chemical reactions. Enzymes carry out most of the reactions involved in metabolism, as well as manipulating DNA in processes such as DNA replication, DNA repair, and transcription. enzymescatalyzemetabolismDNA replicationDNA repairtranscription
Red meat Chicken Fish Pork Eggs Dairy Beans Nuts Seeds
Lipids are also known as fat Lipids may contain the elements C, H, O, N, P The main lipid consumed in vegetable oil and animal fats is a triglyceride.vegetable oil animal fats Triglycerides are composed of 3 (tri) fatty acids and one glycerol (glyceride).
The main biological functions of lipids include energy storage and as structural components of cell membranes (phospholipids).cell membranes
Meats Dairy Pastries Oils Dressings Processed foods Fast foods
There are two nucleic acids: Deoxyribonucleic acid (DNA) Ribonucleic acid (RNA) Nucleic acids contain the elements C, H, O, N, P
DNA and RNA are composed of nucleotides Nucleotides are composed of a sugar, a phosphate group, and a nitrogenous base
DNA nucleotides are composed of the sugar deoxyribose, phosphoric acid, and one of four nitrogenous bases The four nitrogenous bases of DNA are Adenine (A), Cytosine (C), Thymine (T), and Guanine (G) Adenine forms two hydrogen bonds with Thymine Guanine forms three hydrogen bonds with Cytosine
RNA nucleotides are composed of the sugar ribose, phosphoric acid, and one of four nitrogenous bases The four nitrogenous bases of DNA are Adenine (A), Cytosine (C), Uracil (U), and Guanine (G) Adenine bonds with Uracil Guanine bonds with Cytosine RNA is a single stranded molecule
MACROMOLECULEPOLYMERSMONOMERS CarbohydratesPolysaccharidesMonosaccharides ProteinsProteins/PolypeptidesAmino Acids LipidsTriglycerides/PhospholipidsGlycerol + Fatty Acids Nucleic AcidsDNA and RNANucleotides Polymer: a large molecule (macromolecule) composed of repeating structural units Monomer: a small molecule that may bind chemically to other monomers to form a polymer
In order for the human body to utilize the macromolecules it consumes in a meal, it must first break down the nutrients into their simplest form, monomers! This process is achieved in the digestive system by way of enzymes Once the macromolecules are broken into monomers they can be absorbed into the blood stream and transported to the cells where they will continue to perform their functions
Digestion is controlled by enzymes (specialized proteins) Enzymes are biological catalysts Catalysts initiate or speed up a reaction without becoming part of the reaction Proenzymes – inactive enzyme precursor Digestion is accomplished by hydrolysis Hydrolysis is the opposite of dehydration synthesis
Hydrolysis: Hydrolysis is a chemical process in which a certain molecule is split (lysis) into two parts by the addition of a molecule of water (hydro). One fragment of the parent molecule gains a hydrogen ion (H + ) from the additional water molecule. hydrogen ion The other group collects the remaining hydroxyl group (OH − ).hydroxyl
Lipids and Nucleic Acids Pancreatic nuclease enzymes digest nucleic acids (DNA and RNA) to nucleotides in the duodenum. Membrane-bound nucleotidase enzymes in the epithelial cells of the ileum digest the nucleotides to sugar, base and phosphate, which are absorbed.