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A: INTRODUCTION Answers of question 1 to 4 is given below.
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3. a) what are three ways for materials to move in and out of cells?
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- 27. Ions cannot cross directly through a lipid bilayer, yet we know they travel in and out of cells. Which of the following is/are true about how ions diffuse cross membranes? a) They diffuse down their concentration gradients. b) They diffuse through channels formed by integral membrane proteins. c) They diffuse down their electrical gradients. d) a and c e) a, b and c2) Explain how the following cell transport systems work moving materials around inside the cell and other functions. Focus on structure and function, and Include how energy is used to accomplish these movements. A)Tubulin/Kinesin B)Actin/Myosin1. When considering tight junctions, adherens junctions, and desmosomes: a. Which ones do not help in resisting mechanical stress and holding cell shape? Why not? b. Considering how the mechanical junctions are placed in the plasma membrane, why don’t they provide a truly sealed barrier?
- 18. Why is the structure of the cell outer membrane hydrophobic? (1-Mature parent cell Budding- cell 1 μη Test II. Examine the micrograph of the yeast cells. The scale bar under the photo is labeled 1 um. The scale bar works in the same way as a scale on a map, where, for example, 1 inch equals 1 mile. In this case the bar represents one thousandth of a millimeter. Using the scale bar as a basic unit, determine the diameter of the mature parent cell and the new cell. Start by measuring the scale bar and the diameter of each cell. The units you use are irrelevant, but working in millimeters is convenient. Divide each diameter by the length of the scale bar and then multiply by the scale bar's length value to give you the diameter in micrometers.6. A carrot, when dried out, becomes soft. There is a way to make it firm and crisp. Explain how and why, using the following guidelines. a) Draw and label a representative cell of the carrot, in its dried state. Be precise in your drawing. b)Describe the type of extracellular solution that is appropriate to add to make the desired change (name and define what type of solution, the net movements of solvent and solutes, etc.). c)Draw a representative cell of the carrot, in its possible state after the change. Represent the movement of water using an arrow to indicate what has happened.
- 6. Cholesterol serves several essential functions in mammalian cells. Which of the following properties of the membrane is not influenced by cholesterol? A) Thickness B) Rigidity C) Fluidity D) Permeability Answer: Explanation:1. Describe the relationship between the following cellular structures and contents. a) endoplasmic reticulum and the nuclear envelope B) centriole and microtubules C) ribosome and nucleolus D) plastids and pigments3. The diagram to the right depicts a cell submerged in a solution. The cell membrane is permeable to water but not to sugar. Start by completing the % concentrations of water of the intracellular and extracellular solutions. a) What is the cytosol in this example? (circle the correct term below) hypotonic hypertonic isotonic b) How do you know? 30% Sugar % Water d) Predict: What is going to happen to the size(mass) of the cell? 60% Sugar % Water c) Because the solutions are not isotonic, osmosis is going to occur. In what direction is water going to move? e) Predict: What is going to happen to the extracellular solute concentration?
- 9. The Golgi apparatus has a polarity or sidedness (ie., cis and trans faces) to its structure and function. Which of the following statements correctly describes this polarity? A) Transport vesicles fuse with one side of the Golgi and leave from the opposite side. B) Proteins in the membrane of the Golgi may be sorted and modified as they move from one side of the Golgi to the other. C) Soluble proteins in the cisternae (interior) of the Golgi may be sorted and modified as they move from one side of the Golgi to the other. D) All of the above correctly describe polar characteristics of the Golgi function.9. Recall that many cells have polarity (as in directionality, in this case). Consider the apical location of a particular protein (A) expressed in epithelial cells, illustrated in the figure above. Which type of defect described below is the most likely to cause the redistribution of that protein around the entire cell? A) A nonfunctional enzyme glycosylase. B) The deletion of a junctional protein. C) The truncation of a protein found in the extracellular matrix. D) A nonfunctional flippase. Answer: Explanation: apical plasma membrane lateral plasma membrane basal plasma membrane basal lamina protein A tight junction1. Movement of molecules through the cell membrane: A). Define the difference between passive transport and active transport, B). Include examples of each. C). For each example specify the type of cell, the name of the membrane protein(s), and the substance that is being transported. 2. Energy and cellular functions: The evolution of the Prokaryotic cell type into the Eukaryotic cell type is about an increase in cell size and complexity. The Chloroplast and the mitochondrion represent important contributors to this process. A). Compare the structure of the Chloroplasts and the Mitochondrion in the evolution of Prokaryotes and Eukaryotes B). How does each contribute to the evolution of and success of the Eukaryote cell type.