the Millon test‚ Biuret test‚ Benedict’s test‚ Iodine test‚ Grease spot and Sudan Dye test. Know what each test is used for- protein (peptide bonds or tyrosine groups)‚ glucose‚ sucrose‚ starch or lipids. You should know the chemicals/reagents in each test and the results that would indicate a positive or negative for each biochemical. 7. Define and understand the concepts behind common processes including diffusion‚ osmosis‚ active transport‚ Brownian movement and plasmolysis. 8. Understand the
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the ability of bacteria cell wall to retaining the crystal violet dye or methylene blue. The cell walls for Gram positive microorganisms have a higher peptidoglycan and lower lipid content than gram negative bacteria. Bacteria cell walls are stained by the crystal violet. Iodine is then added as a mordant to form the crystal violet and iodine complex so that the dye cannot be removed easily. This step is usually called fixing the dye. However‚ the next treatment with a decolorizer‚ which is a mixed
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Overview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier‚ 8 nm thick‚ controls traffic into and out of the cell. Like all biological membranes‚ the plasma membrane is selectively permeable‚ allowing some substances to cross more easily than others. Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins The main macromolecules in membranes are lipids and proteins‚ but carbohydrates are also important. The
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1. a. List four cell structures that were common to both plant and animal cells. (4 points) b. What structures were unique to plant cells? (2 points) c. What structures were unique to animal cells? (2 points)--Answer below: a. 1. Rough ER 2. Smooth ER 3. Golgi Apparatus 4. Nucleus b. 1. Chloroplast 2. Cell walls 3. Vacuole c.
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Diffusion & Cell Size Lab Background The absorption of nutrients‚ excretion of cellular wastes‚ and the exchange of respiratory gasses are life processes which depend upon the efficient transport of substances into‚ out of‚ and throughout living cells. The process of diffusion can be easily visualized by adding a drop of blue food coloring to a glass of water. Initially‚ the food coloring remains in a small area in the water‚ dying it a dark blue. Over time‚ the molecules of food coloring
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As temperature rises to its optimum temperature‚ the absorbency of light will increase because protein is an enzyme and will therefore be affected by temperature. This is because more beetroot dye will pass through the cell membrane and then into the distilled water. The deeper the colour of the beetroot dye‚ the higher the absorbency of light. Beetroot vacuoles have red pigments which can’t pass through the cell membrane there will therefore be an increase in the amount of red pigment diffusing out
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Osmosis and diffusion are two ways that cells reach this equilibrium‚ without exerting energy. Due to the unique nature of the phospholipid bilayer‚ small molecules can pass through the semipermeable membrane easily‚ through diffusion (https://www.biologycorner.com). Water‚ however‚ has a slightly more difficult time diffusing‚ and diffuses in a different way‚ called osmosis. Osmosis involves aquaporins‚ specialized proteins in the phospholipid bilayer‚ to facilitate the diffusion of water across
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active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship between the size of a molecule and its rate of diffusion? ____________________________________________________________________________
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movement of molecules occurs through diffusion. Diffusion constantly occurs in living cells but the rate of diffusion increases with temperature as molecules gain kinetic energy and move more. Hypothesis The greater the temperature of the water bath the darker the water will be‚ as more pigment leaks out of the beetroot. Procedure Cut sections of uncooked beetroot using a size 4 cork borer and place the sections in distilled water overnight to remove excess dye. Then cut these sections into slices
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Julia Babin Ms. Bukola 11/6/2012 Bio Lab W 8 Cell Structure and Function Prokaryotic cells do not contain a nucleus. Eukaryotic cells do contain a nucleus. Organisms are eukaryotic except Bacteria and Achaea. Organelles are small membranous bodies‚ each with a specific structure and function. Prokaryotes do have cytoplasm‚ which is the material bounded by a plasma membrane and cell wall. This contains ribosomes‚ small granules that coordinate the synthesis of proteins
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