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Questions and Answers
How did Pfeffer explain the osmotic behavior of plant cells in different salt solutions?
How did Pfeffer explain the osmotic behavior of plant cells in different salt solutions?
- By changing the temperature of the salt solutions
- By altering the plant cell structure
- By increasing the volume of the salt solutions
- By postulating the existence of an osmotically semipermeable membrane (correct)
What is the relationship between osmotic pressure (Î ) and the concentration of solute according to Van't Hoff's empirical finding?
What is the relationship between osmotic pressure (Î ) and the concentration of solute according to Van't Hoff's empirical finding?
- Direct proportionality (correct)
- No relationship
- Exponential relationship
- Inverse proportionality
What role does the plasma membrane play in the osmotic behavior of plant cells according to Pfeffer's postulation?
What role does the plasma membrane play in the osmotic behavior of plant cells according to Pfeffer's postulation?
- It increases the amount of water in the cell
- It constitutes an osmotically semipermeable membrane (correct)
- It affects the temperature of the solution
- It regulates the concentration of solutes in the cell
Which type of compounds were found to readily enter the cell based on their partition coefficients?
Which type of compounds were found to readily enter the cell based on their partition coefficients?
What did Overton conclude about the cell membrane based on his findings?
What did Overton conclude about the cell membrane based on his findings?
What did Overton's experiments primarily focus on?
What did Overton's experiments primarily focus on?
Who later proposed the existence of water-filled pores in the plasma membrane to explain the ability of certain compounds to penetrate the cell?
Who later proposed the existence of water-filled pores in the plasma membrane to explain the ability of certain compounds to penetrate the cell?
What was the dominant theory for nerve cells postulated by Bernstein?
What was the dominant theory for nerve cells postulated by Bernstein?
What did Gorter and Grendel determine about the lipid extracted from RBC ghosts?
What did Gorter and Grendel determine about the lipid extracted from RBC ghosts?
What experimental technique did Langmuir use in 1917 to demonstrate the molecular organization of lipids?
What experimental technique did Langmuir use in 1917 to demonstrate the molecular organization of lipids?
What did Fricke's measurements on artificial bilayer lipid membranes and biomembranes confirm?
What did Fricke's measurements on artificial bilayer lipid membranes and biomembranes confirm?
What concept about biomembranes was born based on Gorter and Grendel's results?
What concept about biomembranes was born based on Gorter and Grendel's results?
Who is credited with coining the term 'cell'?
Who is credited with coining the term 'cell'?
What is the significance of observing 'black holes' in soap films?
What is the significance of observing 'black holes' in soap films?
Which physicist estimated the thickness of 'blackest' soap films?
Which physicist estimated the thickness of 'blackest' soap films?
What is the purpose of using an osmometer?
What is the purpose of using an osmometer?
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