Carrier Proteins: Cell Membrane

Words: 483
Pages: 2
Open Document
1. Describe briefly the importance of the cell membrane to the cell.
The cell membrane divides the internal and external environments of the cell. It works to achieve homeostasis by controlling the molecules that comes in and goes out of the cell. (Mader & Windelspecht 2014) 2. Describe the structure of cell membrane, including the phospholipid bilayer and the various types of proteins.
A bilayer is formed by the phospholipids of the membrane, hydrophilic heads face the outside and inside of the cell where there is water, whereas hydrophobic molecules are situated with their tails facing each other avoiding the water. Channel proteins allow substances to move across the membrane, some may include a gate that opens after …show more content…
List the methods by which substances get into and out of cells.
A channel protein allows molecules of a particular size of charge to pass in or out of cells. Carrier proteins merge with other substances that will allow them to be transported across the plasma membrane. Vesicles form to allow macromolecules and larger materials to pass in and out of cells. (Mader & Windelspecht 2014)
4. Explain the role of carrier proteins. Describe facilitated transport and active transport.
Carrier proteins will combine with specific molecules or ions that will result in a change of shape that will allow these certain molecules to be able to be transported across the membrane. In facilitated transport the carrier protein allows the molecule to pass quicker from an area of higher concentration to an area of lower transportation. Active transport requires the use of energy to move molecules from areas of lower concentrations to areas of high concentrations. (Mader & Windelspecht 2014)
5. Define exocytosis and endocytosis.
Exocytosis is the process of moving molecules outside of the cell whereas endocytosis is the process of moving molecules into the cell. (Mader & Windelspecht 2014) 6. What is the effect of placing a red blood cell in an isotonic, hypertonic, or
Show More

Related Documents: Carrier Proteins: Cell Membrane

Chapter 3 Cells The Living Units Printa Essay

Chapter 3: Cells – The Living Units A. Characteristics of cells 1. Background into cell theory a. Spontaneous generation 1) Early theory of origin of life b. Virchow (1832-1902): cells came from other cells c. Pasteur (1822-1895): disproved theory of spontaneous generation 2. Cell’s small size is functionally significant a. If cell is too large, not enough diffusion will occur across membrane to support the cell b. Surface area with x2, volume with x3 B. Membranes 1. Surround: a. Cell: plasma membrane…

Words 717 - Pages 3

Mass Balance Research Paper

disequilibrium: Water moves freely b/w cells and ECF, across semi-permeable (or differentially permeable or selectively permeable) membrane. Eg. dialysis tubing, cellulose acetate sausage casing. • Chemical disequilibrium: Certain solutes are more concentrated in one body compartment than in the other. • Electrical disequilibrium : Many solutes are ions. Body is overall electrically neutral. Few extra –ve ions in ICF vs few extra +ve ions in ECF. Inside of cells slightly negative relative to ECF. Ionic…

Words 4052 - Pages 17

Essay Bio Notes Chap 7

q) how can a cell exchange polar larger molecules with its environment? a) By placing channels, pores, carriers in the lipid bilayer. Most channels and carriers etc are made of proteins that are insisted into the bilayer are called integral proteins. If the integral protiens spans the bilayer, its called a transmembrane protein. A protein that associates with the memebrane but doesn’t get inserted is called a peripheral membrane protein. Many of the transmembrane proteins are carriers or pores or…

Words 467 - Pages 2

Passive Transport Essay

The Transport of Substances across a Cell Membrane Passive Transport – process that enables substances to move in and out of cells without an input of energy from the cell. concentration gradient – a difference in concentration between one side of a membrane and the other. There are three forms of passive transport: 1. Diffusion 2. Osmosis 3. Facilitated Diffusion 1. Diffusion Molecules and ions dissolved in the cytoplasm and extracellular fluid are in constant random motion. Diffusion – is…

Words 562 - Pages 3

Reports: Cell and Membrane Essay

transport in a cell, meaning that materials move into the cell via small membranous sacs. There are three types of endocytosis and they are pinocytosis, which is "cell drinking", liquids are allowed in the cell and these particles are carried into the cell by pinosomes. The other type is phagocytosis, which means "cell eating" and they are received by phagosomes. The third type of endocytosis is receptor mediated endocytosis, these are protein-coated vesicles that work to bring into cell substances that…

Words 2754 - Pages 12

2.4 membranes Essay

Biology 12 Study Guide 2.4 Membranes 2.4.1 Draw and label a diagram to show the structure of membranes. 2.4.2 Explain how the hydrophobic and hydrophilic properties of phospholipids help to maintain the structure of cell membranes. The hydrophobic and hydrophilic properties of phospholipids cause them to align in a bilayers where the hydrophilic phosphate heads will be attracted to the water inside and outside of the cell and the hydrophobic fatty…

Words 560 - Pages 3

Essay about AS cells

Cells Prokaryotic and Eukaryotic Cells - animals and plants are only two of the Kingdoms of living things. Biologists recognise at least five different Kingdoms in the living world. More importantly, the five Kingdoms are divided into two fundamental groupings according to the type of nucleus the cells of their members have. We call the two groupings the prokaryotes and eukaryotes. The eukaryotes are animals, plants, fungi and protoctist. Several individual chromosomes are found within the nucleus…

Words 2141 - Pages 9

Essay about Cell Membrane and Ion Channels

1.6.3 FLUID MOSAIC MODEL OF MEMBRANE STRUCTURE Although the basic structure of biological membranes is provided by the lipid bilayer, membrane proteins perform most of the specific functions of membranes. It is the proteins, therefore, that give each type of membrane in the cell its characteristic functional properties. Amount of protein in membrane varies depending on function (nerve 25%, those involved in ATP production 75%). Like membrane lipids, membrane proteins often have oligosaccharide chains…

Words 1718 - Pages 7

Censoring Huck Finn Essay

Cell membranes are very important structures to cells because they function as a barrier between the components of the cell and the outside environment. The cell membrane is not only responsible for creating a wall between inside and outside the cell, it must also act as a threshold through which select molecules can enter and exit the cell when necessary. The cell membrane is what defines the cell and keeps its components separate from outside cells or organisms. The cell membrane is composed of…

Words 1000 - Pages 4

Cell Membranes Isolate Cell Contents Whole Allowing Communication With The Environment

Notes Cell membranes isolate cell contents whole allowing communication with the environment Functions Isolate cells contents from external environment, allowing concentration gradients of dissolved substances to be produced across the membrane Regulate exchange of essential substances between cell and the extracellular fluid, or between membrane enclosed organelles and the surrounding cytoplasm Allow communication between cells Create attachments within and between cells Regulate…

Words 1841 - Pages 8