6. If a Paramecium swims from a hypotonic to an isotonic environment, will its contractile vacuole become more active or less? Why? 7. Draw an artificial “cell" consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the "environment", as shown in the boxes below. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. "Cell" "Environment" 0.03 M sucrose 0.01 M sucrose 0.02 M glucose 0.01 M glucose 0.01 M fructose a. Draw solid arrows to indicate the net movement of solutes into and/or out of the cell. b. Is the solution outside the cell isotonic, hypotonic, or hypertonic? c. Draw a dashed arrow to show the net osmosis, if any. d. Will the artificial cell become more flaccid, more turgid, or stay the same? e. Eventually, will the two solutions have the same or different solute concentrations?

6. If a Paramecium swims from a hypotonic to an isotonic environment, will its contractile vacuole become more active or less? Why? 7. Draw an artificial “cell" consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the "environment", as shown in the boxes below. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. "Cell" "Environment" 0.03 M sucrose 0.01 M sucrose 0.02 M glucose 0.01 M glucose 0.01 M fructose a. Draw solid arrows to indicate the net movement of solutes into and/or out of the cell. b. Is the solution outside the cell isotonic, hypotonic, or hypertonic? c. Draw a dashed arrow to show the net osmosis, if any. d. Will the artificial cell become more flaccid, more turgid, or stay the same? e. Eventually, will the two solutions have the same or different solute concentrations?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 7RQ: A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with...

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Which of the following statements is true for the figure in question 8? a. The net movement of solutes is into the cell. b. There is no concentration gradient. c. There is a potential for plasmolysis. d. The solvent will move against its concentration gradient. e. If this were a plant cell, turgor pressure would be maintained.
1.How will a plant cell that is subjected to a solute concentration that is less than that of inside the cell will react 2.What is the importance of the concentration gradient in passive transport?
1. What effect does increasing temperature have on the rate of diffusion? 2. Why must a membrane be "semi-permeable" in order for osmosis to occur? 3. What will happen to the shape and appearance of leaf cells if they are placed in a high salt (hypertonic) solution? Why?
3. As a cell increases in size, the surface area and volume both change. A student performed the following activity to model how the surface area and volume change as a cell increases in size. The surface-area-to-volume ratio can be calculated to show the relationship between the two values. Study the data table above. Which cell model has the ideal conditions for diffusion to occur the fastest?
7) Which is the best definition of osmosis?a) movement of molecules from an area of their higher concentration to an area of their lower concentrationb) movement of water across a membrane from an area of high concentration to a lower concentration.c) movement of molecules from an area of their lower concentration to an area of their higher concentration.d) movement of water across a semipermeable membrane from an area of low concentration to a higher water concentration with the use of ATP.e) movement of water across a semipermeable membrane from an area of high concentration to a lower concentration.8) Transcriptional factors are required for transcription in all the following organisms except: a) Protozoa b) Bacteria c) Archaea d) Eukarya e) b & c.9) The composition of the flagellar apparatus is more complex in ___ as compared to Prokaryotes: a) Protozoa b) Bacteria c) Archaea d) Mycota e) a & d
1. Which of the following statements is true? Mitochondria likely originated from an aerobic bacterium engulfed by a pre eukaryotic cell, the signal sequence that directs proteins into mitochondria matrix is a hydrophilic helix; proteins import into mitochondria cross the membrane in folded state; no energy is required for proteins import into mitochondria 2. Which of the following statements about vesicular transport is true? Clathrin is the only coat proteins used in vesicle formation; motor proteins are not needed for vesicular transport; the orientation of transmembrane proteins is not preserved during vesicular transport; cargo proteins do not cross membrane during vesicular transport 3. Which of the following statements regarding the nucleus is true? The nucleus is surrounded by a single layer of membrane, the nuclear envelope is not connected with the ER membrane, proteins of any size can freely diffuse through the nuclear pore complexes
1. Where is the cell membrane located? 2. What is the function of the cell membrane? 3. What does selectively permeable mean? 4. What is the difference between active and passive transport?
25. Diagram the appearance of one Elodea cell (1) mounted in water, and (2) mounted in salt solution normal (1) plasmolyZed (2)
3. The protein integrin binds to actin filaments and, by binding to proteins like fibronectins, connects to collagen. In this manner, integrin ______. A.controls the permeability of the cytoplasmic membrane B. suspends organelles within the cytoplasm C. provides a direct linkage between the cytoskeleton and the extracellular matrix D. helps keep individual cells in place and connects adjacent cells to each other
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.
1 How are soaps made? Draw the full saponification reaction between potassium hydroxide and a triacylglycerol composed of stearic acid, oleic acid and palmitic acid. 2 How do soaps/ detergents work? include diagram. draw a diagram to show how ca2+ would disrupt miscelle formation. 3 draw a sketch of the cell membrane and label any important feature/ structures. how are gases , nutrients, ions transported across th ecell membrane. 4 Lipids are not water soluble, so how are dietary lipids and cholesterol transported?
1. 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?