on the permeability of cell membranes Introduction For my coursework‚ I intend to assess how temperature affects the plasma membrane of a cell. For this I will use the cell of a beetroot. Background What is a cell membrane? The cell membrane‚ also called the plasma membrane is a semipermeable lipid bilayer which is the surface of all cells that surrounds the cytoplasm. The membrane is called a bilayer as it has a double layer of phospholipids. Within the cell membrane there are many biological
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variation in temperature on the permeability of cell membranes using fresh beetroot Aims In this investigation‚ you will subject fresh‚ washed beetroot discs to different temperatures to investigate the effect of temperature on the permeability of the plasma membrane. Overview The beetroot discs will be placed in distilled water at different temperatures. You will compare the intensity of the beetroot pigment that has leaked out from the cells subjectively and possibly objectively using a colorimeter
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nerve cell maintains a difference in charge between the inside and the outside of the cell membrane. This difference in charge is continued by three factors. Firstly‚ in the cell membrane‚ there are sodium potassium ‘pumps’ crossing the membrane which are proteins that bring 2 potassium ions into the cell‚ for every 3 sodium ions it pumps out. As well as this‚ there are protein channels which allow potassium ions in the cell to flow out via facilitated diffusion. Potassium diffuses out the cell much
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Animal Cell Organelles & Their Functions 1. Nucleus - The nucleus generally contains the genetic material for the cell. Because it contains the DNA and chromosomes‚ which affect the proteins that determine the activities of the cell‚ the nucleus can be considered to be the cell’s control centre. 2. Cytoplasm - The cytoplasm contains primarily water and protein material. This is where the other cell organelles reside‚ and where most of the cellular activities take place. 3. Cell Membrane - The
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Cellular organelle structure and function Nucleus The Nucleus is comprised of the pore perforated nuclear membranes‚ nucleoplasm‚ chromatin and the nucleolus at the core. The nuclear envelope consists of an inner and outer membrane that forms the outer structure. Contained within the nuclear membrane are nucloplasm which is the fluid medium in which the chromatin is present‚ chromatin being the genetic material. At the core of the nucleus is the nucleolus‚ where ribosomes are synthesized. The
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The Structure and Function Relationships of Proteins Proteins are a group of organic compounds whose molecules consist of carbon‚ hydrogen‚ oxygen‚ nitrogen and sometimes sulfur atoms. They are condensation polymers of amino acids that are joined by strong peptide bonds. There are 20 different types of amino acids available‚ and the different combinations of these amino acids give it different structures and specific functions to it. Below in this essay‚ will illustrate the how different structure
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The cells of the adaptive immune system are special types of leukocytes‚ called lymphocytes. There are two main types of lymphocytes‚ B cells and T cells‚ which are derived from hematopoietic stem cells in the bone marrow. T cells are involved in cell-mediated immune response‚ whereas B cells are involved in the humoral immune response. The surface of each lymphatic cell has receptors that enable them to recognize foreign substances. There are two major subtypes of T cells: the helper T cell and
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Brain Structures and Functions Viviana N. Reyes ESE370: Learning & the Brain (CXI1409A) Instructor: Charisse Jones March 9‚ 2014 Brain Structures and Functions Many are fascinated by the brain and its functions. Our brain is composed of different units and lobes that work together but each part‚ of course‚ has a special function. We all ask ourselves‚ how is it that we learn? Do our senses have anything to do with getting new information into our brain? Technology
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DNA STRUCTURE AND FUNCTION QUIZ Provide answers to each of the following. You may consult your text and fellow students. Each numbered item counts 2 points. 1. If one strand of a DNA double helix has the sequence GTCCAT‚ what is the sequence of the other strand? a. ACTTGC b. CUGGTU c. CAGGTA d. CAGGUA e. TGAACG 2. If a strand of DNA has the sequence AAGCTC‚ transcription will result in a(n) ______. a. single DNA strand with the sequence TTCGAG
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UMUC Biology 102 Lab 3: Cell Structure and Function Experiment 1: Labeling (consult the Lab 3 Introduction for more details) * * * * * * * Questions 1. For each structure identified‚ do you think its location affects its ability to function? Why or why not? (Hint: those buried deep in the cell probably do different things than those closer to the cell membrane) Everything in a cell seems to be in a position‚ size‚ etc that enables
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