Cell Membrane Simple diffusion is when a small‚ non-polar molecule passes through a lipid bilayer. It is classified as a means of passive transport. In simple diffusion‚ a hydrophobic molecule can move into the hydrophobic region of the membrane without getting rejected. Simple diffusion does not involve a protein. An example of simple diffusion is osmosis. Hydrophilic molecules cannot participate in simple diffusion because they would move into the hydrophobic region of the membrane and be
Premium Membrane biology Cell Cell membrane
POLYMER DATA HANDBOOK *Home *Browse/Search Contents *Browse by Polymer Class *Browse the Index *Online help Copyright © 1999 by Oxford University Press‚ Inc. EDITED BY JAMES E. MARK‚ UNIVERSITY OF CINCINNATI PUBLISHED BY OXFORD UNIVERSITY PRESS The online version of the Polymer Data Handbook includes key data on over two hundred polymers. Please note that entries are presented as PDF files and can only be read using Adobe Acrobat Reader Version 3. If you do not have the freeware reader‚
Premium Polymer
However‚ not all macromolecules enter the cell through the same way. The cell is comprised of mostly cytoplasm and floats in an aqueous‚ watery medium. The cell’s membrane functions as a hydrophobic phospholipid bilayer barrier between both aqueous regions. The heads of the phospholipids are hydrophilic‚ and thus face the aqueous regions to the inside and outside of the cell‚ while the hydrophobic tails face inside. Because the inner region of the cell membrane is hydrophobic‚ macromolecules that are also
Premium Osmosis Concentration Diffusion
Bio 1011 Cells Exam #1 Answer the multiple choice questions on the scantron sheet. Select the one choice that best answers the question. Answer the short answer questions in the space provided at the end of the exam. 1. Which of the following is the SMALLEST? a. a bacterium b. a ribosome c. a hexose sugar d. a water molecule e. a yeast cell 2. The four main families of small inorganic molecules in cells are a. salts‚ sugars‚ fatty acids‚ amino acids‚ nucleotides b.
Premium Protein Amino acid Atom
Truman College Department of Biology Biology 121 Fall ‘14 Francisco Diaz de Leon Assistant Professor Office 2633 Phone: 773.907.4394 Email: fdiaz-deleon@ccc.edu Office Hours: Tuesday and Thursday 8:30 to 11:00 AM; Monday and Wednesday 11 AM to 12 PM; or by appointment. NOTICE: The best way to communicate with me outside the classroom is via email. I do not check phone messages regularly. Course Description: Cellular and molecular biology of the cell. Introduction to biochemistry
Free DNA
Elaine N. Marieb Katja Hoehn CHAPTER PowerPoint® Lecture Slides prepared by Vince Austin‚ Bluegrass Technical and Community College Human Anatomy & Physiology SEVENTH EDITION Cells: The Living Units 3 P ART A Copyright © 2006 Pearson Education‚ Inc.‚ publishing as Benjamin Cummings But First… Let’s clean up… Hydrophobic Hydrophilic Copyright © 2006 Pearson Education‚ Inc.‚ publishing as Benjamin Cummings Plasma Membrane Separates intracellular fluids from extracellular
Premium Protein RNA Cell membrane
Nucleic acids Our class on DNA is divided into 3 parts: (I) Genetics (II) DNA structure (III) Concepts and applications. I. Genetics: In the primordial period‚ simple molecules were formed from atoms and from these molecules‚ macromolecules were formed. These macromolecules formed life and all living organisms. The classical genetic and heredity observations in the 19th century started the search for the origin of life. The transforming principle of DNA was demonstrated from the experiment in
Free DNA
Amino acids are the building blocks of proteins. Amino acids bind together to form polypeptide chains‚ and these polypeptides fold and coil together into specific conformations to form proteins. There are 20 different amino acids‚ each amino acid consisting of four distinct partners. The first is a carboxyl group. A carboxyl group has very weak acids that are able to donate hydrogen ions to biological reactions. The second partner is the amino acid group. Amino acid groups act as the base which‚
Premium Protein Amino acid
sugars | Betaine | Maintains cell fluid balance as osmolytes | Bromelain | Anti-inflammatory agent‚ tenderizes meat | Stomach -the enzymes released by the stomach are known as gastric enzymes. They are responsible for breaking down complex macromolecules like proteins and fats into simpler compounds. Pepsinogen is the main enzyme of the stomach and its active form is pepsin. Stomach secretes hydrochloric acid which kills bacteria and germs and provides an acid environment for proper enzymatic
Premium
“Common biochemical themes are important to understanding cell injury and cell death regardless of the injuring agent” (Heuther & McCance‚ 2012). Cellular injury arises when a cell is unable to sustain homeostasis. The injury can be reversed if the cell can recover from whatever damage was done but if it does not recover the cell will die. The three common forms of cell injury are hypoxic injury‚ free radicals and reactive oxygen species injury‚ and chemical injury. The most common form of cell
Premium Oxygen Mitochondrion Hemoglobin