Bio 1 Carbohydrates, Lipids, Proteins, and Nucleic Acids Biological molecules Carbohydrates, Lipids, Proteins, and Nucleic Acids

Is it made of carbohydrates?

Bio 1 Carbohydrates

Bio 1 Carbohydrates Organic compounds composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio. A carbohydrate with 6 carbon atoms would have… ______ hydrogen atoms and ______ oxygen atoms 12 6 Source of ENERGY Structural components of cells

Monosaccharides Monomer of carbohydrate (simple sugar) Most have 6 carbon atoms Most common: 1) Glucose (main source of energy) 2) Fructose (found in fruits) 3) Galactose (found in milk)

Isomers Glucose, fructose, and galactose have the same chemical formula. C6H12O6 Same formula but different structural forms.

Disaccharides and polysaccharides Disaccharide: two monosaccharides bond to form a double sugar. Example: sucrose Polysaccharide: complex molecule composed of three or more monosaccharides.

Polysaccharides in animals and plants Bio 1 Polysaccharides in animals and plants Glycogen: animals store glucose in the form of the large, complex molecule – glycogen Starch: plants store glucose molecules in the form of starch. Cellulose: large polysaccharide made by plants, which provide strength and rigidity to plant cells.

White vs. whole grain Bio 1 http://www.youtube.com/watch?v=nMtZVmkoJHw&feature=em-share_video_user https://www.youtube.com/watch?v=CtKAAcxZzyM&feature=related

White vs. whole grain Bio 1 White bread is a simple carbohydrate (little nutritional value, digested more quickly, converted to fat more quickly) Whole grain bread is a complex carbohydrate (high in fiber, vitamins and minerals, provide more energy, digested slowly) http://www.youtube.com/watch?v=nMtZVmkoJHw&feature=em-share_video_user https://www.youtube.com/watch?v=CtKAAcxZzyM&feature=related

Lipids

Lipids Large organic molecules Nonpolar – do NOT dissolve in water Bio 1 Lipids Large organic molecules Nonpolar – do NOT dissolve in water Include phospholipids, triglycerides, waxes, steroids Higher ratio of carbon and hydrogen to oxygen than carbohydrates…. More C-H bonds Store more energy per gram than most other organic compounds Butter oil demo

Fatty Acids Hydrocarbon End Carboxyl End C-H -COOH Nonpolar Polar Bio 1 Fatty Acids Carboxyl End -COOH Polar Hydrophilic Hydrocarbon End C-H Nonpolar Hydrophobic http://www.youtube.com/watch?v=ESPNqKUluRs&feature=endscreen&NR=1

Bio 1 Saturated: Each carbon atom is single-bonded to 4 other atoms; straight chain; molecules are close together; solid at room temperature Unsaturated: Double bonds in the C chain; kinked chain; molecules are farther apart; liquid at room temperature

Types of fatty acids: Saturated vs Unsaturated http://www.youtube.com/watch?v=ESPNqKU luRs Let’s list some more differences in the form and function of fatty acids

Types of Lipids made of fatty acids Triglycerides (FATS) 3 fatty acids molecules joined to 1 glycerol Saturated triglycerides are composed of saturated fatty acids (butter, other dairy products, fat from red meat) Unsaturated triglycerides are composed of unsaturated fatty acids (mostly found oils and in plant seeds)

Types of Lipids made of fatty acids Phospholipids Glycerol is connected to 2 fatty acid molecules and a phosphate group. The plasma membrane of the animal and plant cells are composed of a phospholipid bilayer.

Types of Lipids made of fatty acids Waxes Composed of a long fatty acid chain and a long alcohol chain. Waterproof and provide protection. Found on the surface of plants and in the ear canals of many animals (including humans).

Steroids NOT composed of fatty acids Four fused carbon rings which are attached to other functional groups Cholesterol (found in the cell and plasma membrane) Hormones such as testosterone and estrogen

Proteins

Is it made of Proteins?

Proteins ~ What are they? Organic molecules compose of hydrogen, carbon, oxygen and NITROGEN Monomers = AMINO ACIDS Examples: Hair Horns Skin Muscles ENZYMES (to learn more about later!)

Amino Acids (AA) 20 different AA Central carbon, C, that is covalently bonded to 4 other groups Hydrogen = blue Carboxyl (-COOH) = green Amine (-NH2) = yellow R group = red (varies in each AA and determines the AA’s form and function AA can also be illustrated as a ball

DiPeptides and polypeptides Dipeptide: two amino acids bond Polypeptides: long chains of amino acids (made up of 1 or more dipeptide) Making proteins: what builds them? Reaction: condensation or hydrolysis Water is released or used

DiPeptides and polypeptides Some proteins are very large, some are small. Protein shape: Influences its function (form and function) Shape can be influenced by factors like temperature and solvent) … for example, egg white is clear when it is uncooked, and white when it is cooked

ENZYMES RNA or protein molecules that act as biological catalysts Catalyst – speeds up the reaction by lowering the activation energy Essential for cellular function Each Enzyme bonds with a specific Substrate for form the Active Site

How do enzymes work Speed up reactions – how???? Enzyme bonds to substrate and the enzyme shape changed slightly  The chemical bonds in the substrate are weakened  Lowers the activation energy What happens after the reaction? Enzyme releases the products Enzyme is unchanged… BUT changes in temperature and pH can change the enzyme (denature it) and it may not function properly or at all

Nucleic Acids

NUCLEIC ACIDS ~ source of the information Large and complex biological molecules Store and transfer important information in the cell Genetic Code Two types – both are polymers 1. DNA - DeoxyriboNucleic Acid 2. RNA - RiboNucleic Acid DNA is transcribed into RNA, which is translated into PROTEINS

NUCLEIC ACIDS ~ structure Each nucleotide is made of: a phosphate group, a five carbon sugar, and a ring-shaped nitrogen base Nitrogen bases A - Adenine C – Cytosine G – Guanine T – Thymine U - uracil