Chemical Composition of Cells Testing for Proteins: The independent variable is the biuret reagent. The dependent variable is the solutions being used as follows; distilled water‚ albumin solution‚ and starch solution. If the protein is present‚ then the biuret will change to a violet color. Authors: Eliza Koundry and Jody Cote Eliza was in charge of adding equal amounts of biuret reagent to the distilled water‚ albumin solution‚ and the starch solution. Jody was
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Cellulitis: Cellulitis is a common skin infection caused by bacteria. Causes Staphylococcus and streptococcus bacteria are the most common causes of cellulitis. The skin normally has many types of bacteria living on it. When there is a break in the skin‚ however‚ bacteria can enter the body and cause infection and inflammation. The skin tissues in the infected area become red‚ hot‚ irritated‚ and painful. Risk factors for cellulitis include: • Cracks or peeling skin between the
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Galvanic Cells Investigation Equipment: - 2 x 150 ml beaker - sand paper - Voltmeter - Copper electrode - Copper Nitrate - M(1)‚ M(2)‚ M(3) - Electrolyte couples matching the previous metals - two cables connecting the electrodes with the voltmeter - Paper towel - Wash bottle - Sodium Chloride Method: 1. Clean the copper‚ M(1)‚ M(2) and M(3) before starting the experiment. Sand with a fine grade sand paper to take off the outside coating. 2. Add 100 ml of one matching electrolyte
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Cell Size Control David A Guertin‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA David M Sabatini‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA Growth in biological systems is defined as the accumulation of mass‚ which leads to an increase in size. In this article‚ we discuss how cells‚ organs‚ and organisms normally control growth‚ and how deregulated growth can lead to a variety of pathological conditions. Introductory article Article
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the size of cheek cell and onion cell DCP: Introduction: In this experiment‚ Onion cells (Allium cepa) Cheek cells (Homo sapiens) were measured and compared. The aim of this experiment is to find out how both cells differ by comparing their size. Onion cells (Allium cepa) is plant cell and Cheek cells (Homo sapiens) is an animal cell. Hypothesis: The size of an animal cell (Homo sapiens) should be smaller than a plant cell (Allium cepa). Because a plant cell has cell wall which is to maintain
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Animal cells do not have a cell wall. Instead of a cell wall‚ the plasma membrane (usually called cell membrane when discussing animal cells) is the outer boundary of animal cells. Animal tissues therefore require either external or internal support from some kind of skeleton. Frameworks of rigid cellulose fibrils thicken and strengthen the cell walls of higher plants. Plasmodesmata that connect the protoplasts of higher plant cells do not have a counterpart in the animal cell model. During telophase
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Maximum Cell Size & Diffusion – Ferris Shaw Research Question: How does the surface area to volume ratio affect the diffusion rate in agar cubes? Hypothesis: The rate of diffusion in directly related to the surface area to volume ratio of cells and is responsible for the efficiency of absorbing nutrients‚ oxygen‚ minerals etc. in the cell. This ratio is specific to cells as they require a ratio that isn’t big enough to take too long to receive the nutrients and oxygen or too small to
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Introduction There are many ways cells dispose of toxic molecules in order to maintain the necessary internal environmental conditions to survive. These toxic molecules are known as free radicals that contain an unpaired electron on the outer orbit (Proljsak et al.2013). Some examples of free radicals that can be found in the cell are superoxide (O2-)‚ hydrogen peroxide (H2O2) and even reactive metals like copper and iron. These free radicals are produced based on the environment the individuals
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separates eukaryotes from prokaryotes is the presence of _______ in eukaryotic cells. A) ribosomes B) oxidative phosphorylation C) DNA molecules -D) a nucleus 2. Cytoplasmic organelles are - A) absent in prokaryotic cells; present in eukaryotic cells. B) present in both prokaryotic and eukaryotic cells. C) present in prokaryotic cells; absent in eukaryotic cells. D) absent in both prokaryotic and eukaryotic cells. 3. Eukaryotic chromosomes contain _______ DNA molecules. A) single
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Community College | Student Name: | Emily Mansfield | Lecture Activity #3: Cells (Chapter 3) Instructions: Read chapter 3 in your textbook and review the lecture notes and study resources provided by your instructor. Type your answer in the answer block provided for each question. Answer blocks should expand as you type. If you experience difficulty typing in the provided answer blocks‚ you may type your answers in a new document. Save a copy of the completed activity to your computer for
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