Cellular Membranes: Fluid Mosaic of Lipids and Proteins

Selective Permeability: Allows some substances to cross it more easily than others. A phospholipid is an amphipathic molecule, meaning it has both a hydrophilic region and a hydrophobic region. Fluid Mosaic Model: The membrane is a fluid-structure with a “mosaic” of various proteins embedded in or attached to a double layer (bilayer) of phospholipids. The…

Effects of temperature and pH on cell permeability & effects of substrate concentration on enzymes in proteins lab answers

Abstract Proteins are very complex structures and have many variables that affect their function. This lab examined some of those variables. For the first part beef liver, which contains the enzyme catalase, was added to solutions of different concentrations of the substrate hydrogen peroxide. The second and third sections tested the effects of temperature and…

Nutrition Recommendations for Canadians

NUTRITION The study of the nutrients in foods and of the body’s handling of them.  This includes ingestion, digestion, absorption, transport, metabolism, interaction, storage, and excretion. FOOD Material containing nutrients taken into the body for the maintenance of life and the growth and repair of tissues. NUTRIENTS Substances obtained from food and used in the…

Factors Affecting the Activity of Catalase and Amylase Lab Answers

Introduction Proteins (or polypeptides) are organic macromolecules consisting of amino acid subunits (monomers) that are arranged in a specific order and folded into a specific shape. These monomers of amino acids are arranged in a specific sequence known as the primary structure which is determined by the DNA of the gene coding that protein. Amino…