The Biological Importance Of Water Water plays a huge role in our lives‚ the molecule which is comprised of two atoms of hydrogen and one atom of oxygen bonded together has many complex properties. The molecule maintains a bent shape due to its tetrahedral arrangement and the negative lone pair of electrons on the oxygen. The electrons from both hydrogen and oxygen are joined covalently but the difference in electronegativity lets the electrons from hydrogen get pulled slightly toward the oxygen
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about 90% of the water that enters the plant. The other ten percent is used in photosynthesis and cell growth” (Sunny Datko‚ 2012). Adhesion and cohesion are the interaction of water molecules with molecules of other substances. Cohesive and adhesive forces are important for the transport of water from the roots to the leaves in plants. “Plants use cohesion and adhesion forces to make a pull on the water column” (Scott Freeman‚ 2013). This pull results from the tendency of water molecules being evaporated
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BIOCHEMICAL IMPORTANCE OF WATER Of all the simple chemicals that are found in abundance on Earth‚ only water is liquid under normal pressure and temperature. When life first appeared on planet Earth‚ water has played an important role in creating the first organic compounds. The organic compounds later‚ formed the first prokaryotic organisms. Life began‚ as the modern theories support‚ in water and developed for three billion years in it before spreading on land. It is no coincidence that the
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mortality rates from myocardia infraction. “Aspirin irreversibly interferes with function of cyclooxygenase and inhibits the formation of thromboxane A2. Within minutes‚ aspirin prevents additional platelet activation and interferes with platelet adhesion and cohesion. This effect benefits all patients with
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Section 1: Biomolecules & chemical bonding Reading: Chapter 2‚ concepts 2.3 – 2.5 Chapter 3‚ concepts 3.1 – 3.6 Watch and Learn: Biological molecules http://youtu.be/QWf2jcznLsY Basic Key Concepts After completing the readings and practice exercises‚ students should be able to: Define the biologically relevant interactions (bonds) between molecules. List functional groups commonly found in biological molecules. List from memory the electronegativity of carbon‚ nitrogen‚ oxygen
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photosynthesis. Water’s Life-Supporting Properties 2.10–2.13 Describe the special properties of water that make it vital to living systems. Explain how these properties are related to hydrogen bonding. 2.10 Define and distinguish between cohesion‚ adhesion‚ and surface tension. 2.11 Define and distinguish between heat and temperature. Explain how sweating helps to cool your body. 2.12 Explain why ice floats. 2.13 Define a solute‚ a solvent‚ and a solution. 2.14 Explain how acids and bases
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Station #1: Water and Ice Station Observations on a frozen and a normal can of soda being placed in a pool of water: The normal can of soda Is alright The frozen can of soda Is compressed Observations on Ice cubes being poured in ethanol: Ice cube in ethanol The ice cube floated Ice cube in water The ice cube sank Station #2 Cohesive properties of Water Observations on waters cohesive properties using a paper clip and a coin: Paper clip The paper clip stayed on top for a few
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O‚ N‚ F * δ = lowercase delta (+/-) * hydrogen reacts with a lone pair * Transient bond (temporary) * H has a high boiling point * Ice has crystalline structure * Water molecule is bent: 107.5° angle * Adhesion: between molecules and surface * Cohesion: between molecule and molecule * Intermolecular: forces between molecules which hold two or more of them together. (ex. between hydrogen and oxygen‚ sulfur‚ nitrogen or fluorine) * Intramolecular: forces happen inside
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System Unit 2- Chemistry in Biology (ch. 6) Structure of the atom Determining the # of protons‚ neutrons‚ and electrons in atoms‚ ions‚ and isotopes Covalent vs Ionic bonding Reactants vs products Enzymes and activation energy Water’s polarity- cohesion‚ adhesion Heterogeneous vs homogeneous mixtures pH and buffers organic chemistry- proteins‚ carbohydrates‚ lipids‚ nucleic acids (monomers vs polymers‚ examples‚ functions) Unit 3- Cellular Structure and Function (ch. 7) The Cell Theory Microscope diversity
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How does an ionic bond form? 5. What is a H bond and know an example. 6. About chemical reactions: a. What is a chemical reaction? b. Reactants c. Products 7. The polar nature of water gives it extraordinary characteristics” a. Cohesion versus adhesion b. Moderation of temperature b.i. Specific heat b.ii. Evaporation b.iii. Know the difference between temperature and heat c. Why does ice float and what is the significance of this? d. Solvent of life d.i. Solvent d.ii. Solute d
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