8 Questions
Which model of plasma membrane structure is widely accepted?
Fluid mosaic model
What is the structure that surrounds the cytoplasm of a cell?
Cell membrane
What is the consistency of the cell membrane according to the fluid mosaic model?
Flexible and similar to vegetable oil
Which term describes the property of the cell membrane to allow some substances to pass through while restricting others?
Semi-permeable
What is the purpose of the falling sphere viscometer?
To measure the viscosity of a fluid without the need for the fluid to come into contact with a solid material
How is the viscosity of a fluid determined using the falling sphere viscometer?
By measuring the terminal velocity of a known-density sphere in the fluid
What is used to measure the velocity of the sphere in the falling sphere viscometer?
Timing how long it takes for the sphere to pass between two lines in the tube
What happens when a sphere of known diameter and density is dropped into a stationary fluid in the falling sphere viscometer?
The terminal velocity of the sphere can be used to determine the viscosity of the fluid
Study Notes
Plasma Membrane Structure
- The fluid mosaic model is widely accepted as the most accurate representation of plasma membrane structure.
Cell Membrane
- The cell membrane, also known as the plasma membrane, surrounds the cytoplasm of a cell.
Fluid Mosaic Model
- According to the fluid mosaic model, the cell membrane has a semi-fluid consistency.
Cell Membrane Properties
- The cell membrane is selectively permeable, allowing some substances to pass through while restricting others.
Falling Sphere Viscometer
- A falling sphere viscometer is used to measure the viscosity of a fluid.
Measuring Viscosity
- The viscosity of a fluid is determined by measuring the time it takes for a sphere to fall a certain distance through the fluid.
Falling Sphere Viscometer Components
- The velocity of the sphere is measured using a stopwatch or a photogate timer.
Falling Sphere Viscometer Operation
- When a sphere of known diameter and density is dropped into a stationary fluid in the falling sphere viscometer, it falls at a constant velocity due to friction and gravity.
Test your knowledge of the structure of the cell membrane with this quiz. Learn about the fluid mosaic model and how it describes the flexible and semi-permeable nature of the cell membrane.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
