Podcast
Questions and Answers
Which of the following factors can affect the permeability of cell membranes?
Which of the following factors can affect the permeability of cell membranes?
- Ethanol and osmotic pressure
- Temperature and pH (correct)
- Salinity and atmospheric pressure
- pH and light exposure
What is the role of intrinsic proteins in the plasma membrane?
What is the role of intrinsic proteins in the plasma membrane?
- Serving as channels or carrier proteins for transporting molecules (correct)
- Found on the surface of the membrane
- Acting as enzymes to catalyze chemical reactions
- Regulating the stability and fluidity of the membrane
What is the purpose of using plant cells containing a colored pigment, like beetroot, in membrane permeability experiments?
What is the purpose of using plant cells containing a colored pigment, like beetroot, in membrane permeability experiments?
- To investigate the effect of pressure on cell membranes
- To study the effect of light intensity on membrane stability
- To determine enzyme activity within cells
- To measure membrane permeability by observing pigment leakage (correct)
What is the suggested method for preparing beetroot samples for a membrane permeability experiment?
What is the suggested method for preparing beetroot samples for a membrane permeability experiment?
In investigating the effect of temperature on membrane permeability, what range of temperatures can be used in the experiment with plant cells?
In investigating the effect of temperature on membrane permeability, what range of temperatures can be used in the experiment with plant cells?
What is the primary function of extrinsic proteins found on the surface of the plasma membrane?
What is the primary function of extrinsic proteins found on the surface of the plasma membrane?
What is the main reason the fluid mosaic model is called 'fluid'?
What is the main reason the fluid mosaic model is called 'fluid'?
What role do glycoproteins play in the plasma membrane?
What role do glycoproteins play in the plasma membrane?
How do glycolipids contribute to the plasma membrane's function?
How do glycolipids contribute to the plasma membrane's function?
What is the primary function of phospholipids in the plasma membrane?
What is the primary function of phospholipids in the plasma membrane?
Why is cholesterol important in the plasma membrane?
Why is cholesterol important in the plasma membrane?
Which component of the plasma membrane acts as 'flags' for cell identification?
Which component of the plasma membrane acts as 'flags' for cell identification?
What is the purpose of using a colorimeter in this experiment?
What is the purpose of using a colorimeter in this experiment?
What happens to membrane permeability at temperatures below freezing?
What happens to membrane permeability at temperatures below freezing?
Why does membrane permeability increase rapidly above 45°C?
Why does membrane permeability increase rapidly above 45°C?
What effect does an increase in temperature have on membrane fluidity?
What effect does an increase in temperature have on membrane fluidity?
How does permeability change between 0°C and 45°C?
How does permeability change between 0°C and 45°C?
What effect do ice crystals have on membrane permeability?
What effect do ice crystals have on membrane permeability?
What happens to a potato placed in a solution of higher water potential?
What happens to a potato placed in a solution of higher water potential?
What is the result when a potato is placed in a solution of lower water potential?
What is the result when a potato is placed in a solution of lower water potential?
What does it mean when there is no change in mass after placing a potato in a solution?
What does it mean when there is no change in mass after placing a potato in a solution?
What does active transport involve?
What does active transport involve?
What is the purpose of preparing serial dilutions of sucrose solution in the method described?
What is the purpose of preparing serial dilutions of sucrose solution in the method described?
In the method described, what does the percentage change in mass of the potato pieces indicate?
In the method described, what does the percentage change in mass of the potato pieces indicate?
What is the purpose of adding stain like eosin to the specimen?
What is the purpose of adding stain like eosin to the specimen?
What is the role of the cover slip when preparing a specimen on a microscope slide?
What is the role of the cover slip when preparing a specimen on a microscope slide?
Why is homogenisation important in cell fractionation?
Why is homogenisation important in cell fractionation?
What does cell fractionation aim to achieve?
What does cell fractionation aim to achieve?
Why is it essential to start with the lowest-powered objective lens when viewing specimens under a microscope?
Why is it essential to start with the lowest-powered objective lens when viewing specimens under a microscope?
What is the purpose of spinning the cell solution at high speeds in cell fractionation?
What is the purpose of spinning the cell solution at high speeds in cell fractionation?
