In our Mediaphys Lesson I learned that the primary structure of a cell membrane is made up of a double layer of phospholipids molecules. The hydrophilic heads of the phospholipid molecules face outwards towards the water base solutions inside and outside the cell. The membrane is also made up of proteins‚ carbohydrate molecules‚ and cholesterol that form gates and pores‚ cell recognition‚ and stability. Active transport is used when a cell needs a substance to cross the membrane against its concentration
Premium Cell membrane Red blood cell
BIOLOGY REVIEW UNIT 1 BIOCHEMISTRY 1) Describe the structure of an atom and compare this to the structure of an ion. * Atoms have protons and neutrons in their nucleus making them electrically neutral 2) Complete the following table Element Name | Boron | Oxygen | Beryllium | Sodium | Symbol | B | O | Be | Na | Atomic # | 5 | 8 | 4 | 11 | # of Protons | 5 | 8 | 4 | 11 | # Neutrons | 6 | 8 | 5 | 12 | Total # electrons | 5 | 8 | 4 | 11 | #Electrons in 1st Shell | 2 |
Premium Amino acid Protein Cell
Beaker #1‚ which is filled to 200 mL of tap water? My prediction is that there will be no change in the weight. Since solutions that contain the same concentrate of solute particles per volume of a solution that than within the cells are said to be isotonic solutions‚ which means the concentration of a solute particles is the same on
Premium Diffusion Molecular diffusion Osmosis
When Different Colors of Food Coloring Are Soaked into a Naked Egg‚ Will the Mass Change Depending on the Color of the Ink after 7 Days? The Purpose The purpose of initiating this lab was to test how different chemicals in the outer fluid affects the osmotic properties of a naked egg. Background Information In order to complete this experiment‚ one of the most important things you need to know how to do is how to take the outer “shell” layer off of the egg. The egg shells contain an element known
Premium Bacteria Chemistry Osmosis
Bibliography: Corbis Coporation. (2009‚ September 22). Human Red Blood Cells in Physiological Isotonic Saline Solution (0.9% nacl) Sem x1000 by Dennis Kunkel Microscopy‚
Premium Diffusion Microscope Sodium chloride
OSMOSIS LAB BACKGROUND INFORMATION. Dialysis tubing is being used to model a plasma membrane. Isotonic solutions are solutions that have the same concentration of solutes on both sides of the membrane. Hypertonic solutions are solutions that have more solute to the one with less solute. Hypotonic solution are solutions that have less solute to the one with more solute. RESEARCH QUESTION:which dialysis tubing will gain the distilled water and which one will loss its content
Free Concentration Solution Solubility
suitable concentration. (a) Amoeba‚ living in freshwater‚ uses a contractile vacuole to expel the excess water from its cytoplasm (thus need more respiration/O2/ATP than isotonic (marine) Amoebae). (b) The kidneys maintain the blood (thus‚ whole body) at the correct concentration. Osmosis and Plant Cells (a) Plant Cells in a hypotonic (= weaker) solution – cells have lower water potential • the plant cells gain water by osmosis. • the vacuole and cytoplasm increase in volume. • the cell membrane
Premium Osmosis Cell wall Cell membrane
Lesson 1 Key Questions 1. Mg2+ has 10 electrons 2. Given that the half life of the radioisotope carbon -14 is 5730 years‚ it would not be useful in dating bones that are over a million years old. After 40 000 years of age less than 1% of the 14C is left in the bone and thus it is not useful for determining the exact age beyond that. 3. Hydrolysis - A chemical reaction where a chemical is broken down by a reaction with water. Hydrolysis is important for the digestion of food‚ making
Premium Carbon Isotope Proton
| | Answers are attached Enjoy Biology‚ 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir
Premium Atom Covalent bond Cell membrane
STUDY GUIDE FOR PRACTICAL #1 Spring 2015 Bio 115 (Biology I Lab) 1. Be able to identify the parts of the compound light microscope. Know the functions of those parts. 2. Understand how to focus a slide/specimen under the microscope. Be familiar with the steps taken to focus under low and high power. Be ready to define and calculate total magnification and know what happens to the field of view when the magnification is increased. 3. Understand how to measure the field diameter using a
Premium Scientific method Functional groups Chemistry