9a.) A bacterial cell, which has a cytoplasmic solute concentration of 0.85% NaCl is placed into a tube containing a solution of sodium chloride that is 0.2%. Into what type of solution has the cell been placed? a. hypotonic b. isotonic c. hypertonic b.) In which direction will both solute (NaCl, or sodium chloride) and water flow? 10.) Circle all of the following eukaryotic cell types that do not have a cell wall. a. fungi b. animal c. plant d. algae 11a.) What is the name of the cell wall substance that is not found in any eukaryote or archaea and that distinguishes Gram-positive and Gram-negative bacterial cells? b.) Briefly describe the composition of this prokaryotic cell wall component. 12.) What is the function of pili in bacteria? 13.) Write both the genus and species of the microorganism that causes strep throat and its complications (sequelae); pay attention to capitalization and italics!
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The bacterial cell has a cytoplasmic sodium chloride concentration of 0.2%, and it is placed in a solution with a concentration of 85% NaCl. To determine if the solution is hypotonic, isotonic, or hypertonic, we need to compare the concentrations of the two Show more…
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0.9% NaCl is isotonic due to: (a) There is no movement of isotonically active ions in the solution into cells (b) The ions are not being metabolized (c) Has similar tonicity as blood (d) All of the above 3. Cell membrane facing exterior of the cell has: (a) Hydrophobic ends (b) Hydrophilic ends (c) Both of the above (d) Neutral ends 4. Threshold for excitation of nerve is low and is least for: (a) Electrical stimulus (b) Mechanical stimulus (c) Chemical stimulus (d) None of the above 5. Genesis of resting membrane potential is mainly because of: (a) K+ permeability is equal to Na+ permeability (b) K+ permeability is more than Na+ permeability (c) K+ permeability is less than Na+ permeability (d) None of the above 6. Magnitude of diffusion from one region to another: (a) Is not affected by an electrical charge of substances (b) Is directly proportional to the cross sectional area (c) Is inversely proportional to the concentration gradient (d) Is not depended from the diffusion coefficient. (e) All of the above are wrong 7. Lipid bilayer permeability of a cell membrane depends upon: (a) Size of molecule (b) Charge of molecule (c) Lipid solubility (d) All of the above
Madhur L.
Practice Questions: Diffusion and Osmosis Osmosis is the diffusion of water molecules across a selectively permeable membrane. Diffusion of molecules occurs in conjunction with the bulk flow of water, either against the concentration gradient or down the concentration gradient. In a state of equilibrium, diffusion of gases and water occurs across a selectively permeable membrane in an aqueous (watery) medium. The concentration of solutes outside the cell is lower than the concentration of solutes in the cytoplasm of the cell. Compared to its surroundings, the cytoplasm is: A. Hypertonic B. Hypotonic C. Isotonic D. Cannot be determined Which of the following represents a hypertonic solution compared to the cytoplasm of your cells? A. 0.85% salt B. 0.001% salt C. 8.5% glucose D. 5% salt E. Both C and D Which of the following represents an isotonic solution compared to the cytoplasm of your cells? A. 0.85% salt B. 0.001% salt C. 8.5% glucose D. 5% salt E. Both C and D Which of the following represents a hypotonic solution compared to the cytoplasm of your cells? A. 0.85% salt B. 0.001% salt C. 8.5% glucose D. 5% salt E. Both C and D
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