BIOL 140 Lab—The Chemical Composition of Cells Name ____________________________ I) Introduction All cells contain four major types of macromolecules: carbohydrates‚ lipids‚ nucleic acids‚ and proteins. In today’s lab‚ we will be studying three of the four-proteins‚ carbohydrates and lipids. Various chemical tests can be used to detect the presence of each of these molecules. Most of the tests involve a color change visible to the eye. If a color change is observed‚ the test is considered positive
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Biology 100 Lab Laboratory Report Title: Identifying the four major classes of macromolecules through various tests. Group Members: Antonia Johnson‚ Payton Ewing‚ Lenneisha Hepburn‚ Kendisha Hanna‚ Introduction: Macromolecules also known as biological molecules are monomers which are the simple units of polymers. All macromolecules contain carbon and hydrogen which are found in organic compounds. In this Experiment we will test for the presence of protein‚ starch‚ lipids‚ and sugars by analyzing
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there is no net loss or gain of water. Introduction This study shares the results of an effort to understand diffusion and osmosis in general. It focused more into osmosis in plants cell‚ and how to indirectly measure osmolarity in potato tuber tissue. Osmosis is the diffusion specifically of water across a membrane. Diffusion occurs when certain substance‚ such as an ion‚ is more concentrated on one side of membrane. If the membrane allows this ion through‚ the ions will move from the more
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The aim of this experiment was to show the water potentials of young‚ old and damaged potatoes and different sucrose concentrations (0.15‚ 0.20‚ 0.25‚ 0.30‚ 0.35 and 0.50). It was expected that the potatoes would lose weight as the potatoes would have lower water potential when placed in a solution ‚ and in this can be taken from the theory of osmosis which states that “the passive diffusion of water molecules across a selectively permeable membrane down a concentration gradient” (Taylor and Bruenn
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BLUE/EOSIN- used for light microscope Specimen dipped in METAL like lead (metal ions scatter electrons to contrast)- used for electron microscope SECTIONING: Sections of tissue need to be cut into thin slices Allows beam of light to pass through section of tissue Specimens are embedded in wax Makes it easier to identify tissue CELL ORGANELLES: ORGANELLE STRUCTURE
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common senses Flavors‚ aromas‚ and chemical signals released from animals can make the mouth water‚ evoke vivid memories‚ and perhaps even signal stress or fertility. How does the brain sort it all out? Salt! &! Sugar" 1 Salt " • Table Salt – Sodium Chloride (may include • Kosher Salt – Large grain salt (sodium • Sea Salt – mixture of salts found in common sea water" chloride)" some additives like Iodine)" Salt substitutes " Salt substitutes are low-sodium table salt alternatives
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be equal to the water potential of the cell. Use of this fact can be made in estimating the water potential of a plant tissue. Samples of tissue are immersed in a range of external solutions of different strengths. The solution that induces neither an increase nor a decrease in the volume or mass of the tissue has the same water potential as that of the cells in the tissue. The cells to be investigated in this experiment are those of the potato tuber. Changes in mass will be used as an indication
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want to find out? The aim of this experiment is to investigate how potato tissue changes when placed in sucrose solution of different concentrations. Therefore‚ I want to find out if and how osmosis differs‚ when the concentration is changed. Variables What is the variable you are going to change in the experiment? The input variable of this experiment (i.e. the variable to change) will be the concentration of sucrose solution present in the test tubes‚ which the potato samples will be placed
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your esophagus‚ even though you ’re in an upright position. The acid backup is worse when you ’re bent over or lying down. Some factors that can cause the sphincter to relax abnormally include:  Fatty foods  Chocolate‚ caffeine‚ onions‚ spicy foods‚ mint and some medications  Alcohol  Large meals  Lying down soon after eating  Tranquilizers‚ such as benzodiazepines including diazepam (Valium) and alprazolam (Xanax)  Theophylline
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BIOLOGY LABORATORY Biologically Important Molecules Carbohydrates‚ Proteins‚ Lipids‚ and Nucleic Acids Objectives In this lab you will learn to: 1. Perform tests to detect the presence of carbohydrates‚ lipids‚ proteins‚ and nucleic acids 2. Recognize the importance of a control in a biochemical test 3. Use biochemical tests to identify an unknown compound Introduction Organic molecules are those primarily made up of carbon‚ hydrogen and oxygen. The common organic compounds of living
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