Fluid Mosaic Model of the Cell Membrane

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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?

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?

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?

Rinse each piece to remove released pigment, ensuring samples are similar in size Signup and view all the answers

In investigating the effect of temperature on membrane permeability, what range of temperatures can be used in the experiment with plant cells?

0 to 70°C Signup and view all the answers

What is the primary function of extrinsic proteins found on the surface of the plasma membrane?

Functioning as enzymes to catalyze reactions Signup and view all the answers

What is the main reason the fluid mosaic model is called 'fluid'?

Due to the constant movement of phospholipids Signup and view all the answers

What role do glycoproteins play in the plasma membrane?

Act as recognition sites and antigens Signup and view all the answers

How do glycolipids contribute to the plasma membrane's function?

By increasing membrane stability with hydrogen bonds Signup and view all the answers

What is the primary function of phospholipids in the plasma membrane?

Form a barrier to lipid-soluble molecules Signup and view all the answers

Why is cholesterol important in the plasma membrane?

To push phospholipids closer together Signup and view all the answers

Which component of the plasma membrane acts as 'flags' for cell identification?

Glycolipids Signup and view all the answers

What is the purpose of using a colorimeter in this experiment?

To measure how much light is absorbed by each liquid Signup and view all the answers

What happens to membrane permeability at temperatures below freezing?

Increases as proteins in the membrane unfold and become deformed Signup and view all the answers

Why does membrane permeability increase rapidly above 45°C?

As proteins in the membrane become denatured and start to unravel Signup and view all the answers

What effect does an increase in temperature have on membrane fluidity?

Increases fluidity Signup and view all the answers

How does permeability change between 0°C and 45°C?

Membranes are partially permeable Signup and view all the answers

What effect do ice crystals have on membrane permeability?

Increase permeability by puncturing the membrane Signup and view all the answers

What happens to a potato placed in a solution of higher water potential?

It gains mass Signup and view all the answers

What is the result when a potato is placed in a solution of lower water potential?

It loses mass Signup and view all the answers

What does it mean when there is no change in mass after placing a potato in a solution?

The solution is isotonic Signup and view all the answers

What does active transport involve?

Moving molecules from low to high concentration with carrier proteins Signup and view all the answers

What is the purpose of preparing serial dilutions of sucrose solution in the method described?

To determine the concentration of sucrose that results in no change in mass of potato pieces Signup and view all the answers

In the method described, what does the percentage change in mass of the potato pieces indicate?

The osmotic effect of different sucrose concentrations on the potatoes Signup and view all the answers

What is the purpose of adding stain like eosin to the specimen?

To create contrast and enable visualizing organelles Signup and view all the answers

What is the role of the cover slip when preparing a specimen on a microscope slide?

To protect the specimen and prevent air bubbles Signup and view all the answers

Why is homogenisation important in cell fractionation?

To release organelles by breaking apart the plasma membrane Signup and view all the answers

What does cell fractionation aim to achieve?

Separating organelles based on density Signup and view all the answers

Why is it essential to start with the lowest-powered objective lens when viewing specimens under a microscope?

To increase magnification gradually for better focus Signup and view all the answers

What is the purpose of spinning the cell solution at high speeds in cell fractionation?

To separate organelles based on density Signup and view all the answers

Fluid Mosaic Model of the Cell Membrane

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Questions and Answers

Which of the following factors can affect the permeability of cell membranes?

What is the role of intrinsic proteins in the plasma membrane?

What is the purpose of using plant cells containing a colored pigment, like beetroot, in membrane permeability experiments?

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?

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 role do glycoproteins play in the plasma membrane?

How do glycolipids contribute to the plasma membrane's function?

What is the primary function of phospholipids in the plasma membrane?

Why is cholesterol important in the plasma membrane?

Which component of the plasma membrane acts as 'flags' for cell identification?

What is the purpose of using a colorimeter in this experiment?

What happens to membrane permeability at temperatures below freezing?

Why does membrane permeability increase rapidly above 45°C?

What effect does an increase in temperature have on membrane fluidity?

How does permeability change between 0°C and 45°C?

What effect do ice crystals have on membrane permeability?

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 does it mean when there is no change in mass after placing a potato in a solution?

What does active transport involve?

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?

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?

Why is homogenisation important in cell fractionation?

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?

What is the purpose of spinning the cell solution at high speeds in cell fractionation?

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