By Leesa Blake, Meaghan Craven, Darcy Dobell, Nancy Flood, Gord Jasper, Catherine Little, Adrienne Mason, Grace Price, Karin Banerd, Jonathan Bocknek, Marshall Letcher, D'Arcy Little
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What role do buffers play in a cell? 5. ” 6. Which part of the atom is most involved in chemical reactions? 7. What is a valence electron? 8. Describe the structure and function of a chemical bond. 9. Use examples to explain how an ionic bond is different from a covalent bond. 14. Identify two isomers of glucose. How are these molecules similar? How are these molecules different? 15. How do functional groups change the nature of hydrocarbon chains? 16. What is meant by oxidation? 17. ” Use these terms in a description of carbohydrates.
Enzymes and the Catalytic Cycle The acceleration of a chemical reaction by some substance, which itself undergoes no permanent chemical change, is called catalysis. The catalysts of metabolic reactions are enzymes, which are involved in almost all chemical reactions in living organisms. Without enzymes, metabolic reactions would proceed much too slowly to maintain normal cellular functions. Consider the hydrolysis of sucrose, an exothermic reaction. A solution of sucrose dissolved in water could sit for years without showing signs of hydrolysis.
Part B 1. Using the balance, measure 3 g of sodium chloride. 2. Pour a small amount of water into a test tube. Record the temperature of the water. 3. Pour the sodium chloride into the test tube and gently swirl the contents until the sodium chloride dissolves in the water. 4. Immediately insert the thermometer into the solution and record the temperature. Note any changes in the appearance of the substances in the test tube or any evidence of a chemical reaction occurring in the mixture. 5. Record the temperature every 30 s until there is no change for at least three minutes.
Biology 12 by Leesa Blake, Meaghan Craven, Darcy Dobell, Nancy Flood, Gord Jasper, Catherine Little, Adrienne Mason, Grace Price, Karin Banerd, Jonathan Bocknek, Marshall Letcher, D'Arcy Little