Biology 2051Chapter 5 HW Assignment.docx

Biology 2051Chapter 5 HW Assignment.docx - Chapter 5...

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Chapter 5 Homework 1. Cellular Structures - A person working in your lab creates a synthetic semi-fluid like substance embedded with proteins that transport nutrients and ions. This leads you to believe the substance is most similar to a. Cytoplasm b. Mitochondrial matrix c. Cell membranes d. Rough ER e. Smooth ER 2. Types of Membrane Proteins - A protein is tightly associated with the plasma membrane but it can be isolated by treating the membrane with a strong detergent. What type of membrane protein is this? a. Neither an integral nor a peripheral membrane protein b. A peripheral membrane protein c. An integral membrane protein d. Either an integral or a peripheral membrane protein 3. Pumps - The plasma membrane Ca 2+ -ATPase is a pump that functions in the primary active transport of Ca 2+ out of the cell. What features do you expect of this pump and the cellular environment? Choose all that apply. a. It transports Na + and K + ions b. It is an antiporter c. The extracellular Ca 2+ concentration than the intracellular Ca 2+ concentration d. It hydrolyzes ATP e. It is capable of undergoing a conformational change f. The affinity for Ca 2+ is low when the pump is bound to phosphate g. It transports Ca 2+ down its concentration gradient 4. Transportation of Ions and Molecules - ___________ bind to two or more ions or molecules and transport them in opposite directions across a membrane. a. Dual transporters b. Antiporters c. Channel pumps d. Uniporters e. symporters 5. Definition of Simple Diffusion - Simple diffusion is defined as the movement of a. Gas molecules across a membrane
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b. Molecules from areas of lower concentration to areas of higher concentration c. Gas or water molecules across a membrane d. Water molecules across a membrane e. Molecules from areas of higher concentration to areas of lower concentration 6. Equilibrium in Simple Diffusion – When sugar is mixed with water, equilibrium is reached when a. molecules of sugar stop moving b. water and sugar molecules are moving at the same speed c. the dissolved sugar molecules are evenly distributed throughout the solution d. there are the same number of water molecules as dissolved sugar molecules e. two tablespoons of coffee are added 7. Factors Influencing Diffusion Rates - The rate of diffusion is affected by temperature, size of molecule, and size of the concentration gradient. Use this information to determine which system in the following examples will have a higher initial rate of diffusion. a. 0.2 mL of 2 mM sodium chloride added to 1.0 L water vs. 0.2 mL of 2 M sodium chloride added to 1.0 L water b. 0.2 mL of a 2 mM solution of the enzyme carbonic anhydrase added to 1.0 L water vs. 0.2 mL of 2 mM sodium chloride added to 1.0 L water c. A cube of sugar in hot coffee vs. a cube of sugar in room temperature coffee 8. Lateral Diffusion in Plasma Membranes - A phospholipid will laterally diffuse in a plasma membrane faster than an integral membrane protein. What is the simplest explanation for this phenomenon?
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