Membrane biology

of the potato when it is put in water and different concentrations of salt? Introduction Osmosis is the diffusion of water molecules from a region of higher concentration to a lower concentration of water molecules (through a partially permeable membrane). If the cell is placed in a higher water potential, water enters by osmosis and if the cell is placed in lower water potential, then the water leaves the cell by osmosis. The experiment we did shows the process of osmosis. How osmosis really…

Name: Alexis Vick Drawer/Group #: 12 PS ID #: 1059363 Three digit mutant code: 458 BIOL 3311 Fall 2014 Lab Section: 20091/Tu4 Date: 09/29/14 TA Instructor Name: Laura Montier Drosophila Melanogaster: Decapentaplegic gene The fruit fly, Drosophila Melanogaster, has been used for years as a model for genetics. The flies are small and easy to maintain in a lab, cost-efficient, and have a quick life cycle, all qualities that make this a prime organism to utilize for genetic…

With natural selection its major driving mechanism, evolution is the change over time in the makeup of genetics of a population. Supported by evidence from many scientific methods, Charles Darwin, in On the Origin of Species, asserts that inheritable variations occur in individuals in a population. In the process known as natural selection, due to competition for limited resources, individuals with more favorable characteristics or phenotypes are more likely to survive and better reproduce,…

yeast-producing recombinant human antibodies have been generated. Yeast is single celled eukaryotic microbes that belong to the kingdom fungi. In addition to having many structures that are similar to other eukaryotic cell, yeast also contain a number of membrane-enclosed organelles in the cytoplasm, a cytoskeleton and chromosome structures similar to human chromosomes. Yeast cells also have larger genomes than most bacteria. Moreover, mechanism of gene expression in yeast resembles those in…

Introduction Drosophila melanogaster, commonly known as fruit fly or vinigar fly coming under the family Drosophilidae. The normal life span of the flies are generally 30 – 60 days and it may vary depend upon the external conditions. These flies are sexually dimorphic. The female flies are comparatively bigger than the male flies. The males flies and females fly can be easily distinguish with size difference and the colour pattern. The male flies have a dark band on the abdomen. The presence…

Biology 15 Lab # 4 Professor Passerini September 23, 2015 Scot Albert Lab #4 Questions 1a,b,c, 2, 3a,b,c, 4, 5a,b,c, 7, 11c, d, e, 12a,b ---------------------------------------------------------- 1- a-They are found primarily in the thylakoid membranes. b-No. Cyanobacteria do not have distinct nuclei. c-Gloeocapsa ------------------------------------------------------ 2-They were much smaller by comparison. ------------------------------------------------------- 3- a-I think we…

of peptidoglycan that is enclosed by an outer membrane. The outer membrane is surrounded by special phospholipids composed of fatty acids called lipopolysaccharides that are attached to a glucosamine…

THE EFFECTS OF OSMOSIS INTRODUCTION Osmosis is the process where molecules of a solvent are prone to pass through a semi-permeable membrane, going from a less concentrated solution to a higher concentrated solution. Doing this equalizes the concentrations on both sides of the membrane. Our question throughout the experiment was; What effects do the different concentrations of sucrose have on the rate of osmosis? The hypothesis was; If the solute concentrations do effect the rate of osmosis,…

substances across the cell membrane. The cell membrane is found on the outside of the cell and controls what goes in and out of the cell. It is selectively permeable. The membrane has cells that share common structural features, including an outer boundary. All cells are contained by a cell membrane, which keeps the pieces inside. It consists of a phospholipid bilayer with proteins embedded throughout. It separates what’s inside the cell, some of the proteins. The plasma membrane helps maintain…

Permeable Bags Placed in Different Concentrations of Water and Sucrose Introduction Osmosis is defined as the movement of water from a region of water that has a higher potential to a region of water that has a lower potential through semipermeable membranes. There are three types of solutions, hypertonic, hypotonic, and isotonic. Hypertonic solutions have a higher concentration of solute while hypotonic solutions have a lower concentration of solute. Isotonic solutions have an equal…