NEW
Font size
WorksheetsPlasma Membrane and Cellular Transport
Total questions: 23
Worksheet time: 12mins
What is the main function of the plasma membrane in the cell?
Protect the nucleus of the cell.
Regulate the passage of substances in and out of the cell.
Produce energy for the cell.
Store genetic information.
Which component of the plasma membrane is responsible for its fluidity?
Carbohydrates
Proteins
Cholesterol
Nucleic acids
What is the role of carbohydrates in the plasma membrane?
Provide energy to the cell.
Facilitate cell communication.
Transport oxygen.
Store lipids.
What are lipids?
Small molecules composed of amino acids.
Large molecules composed of glycerol and three fatty acids.
Large molecules composed of simple sugars.
Small molecules composed of nucleotides.
How are phospholipids organized in the phospholipid bilayer?
In a single layer of phospholipids.
In two layers of phospholipids arranged head to head.
In two layers of phospholipids arranged tail to tail.
In three layers of phospholipids arranged randomly.
What function does the phospholipid bilayer have in the plasma membrane?
It allows the plasma membrane to be rigid and not flexible.
It allows the plasma membrane to survive and function in its aqueous environment.
It makes the plasma membrane impermeable to all substances.
It allows the plasma membrane to dissolve in water.
What is the characteristic of the tails of phospholipids in the phospholipid bilayer?
They are polar and attract water.
They are non-polar and repel water.
They are polar and repel water.
They are non-polar and attract water.
Which part of the phospholipid is attracted to water?
The hydrophobic tails.
The polar heads.
The polar tails.
The hydrophobic heads.
Why are the heads of phospholipids near the water inside and outside the cell?
Because they are non-polar.
Because they have a negative charge and are polar.
Because they are hydrophobic.
Because they repel water.
What is the main function of the phospholipid bilayer in cells?
Act as a selective barrier.
Produce energy for the cell.
Store nutrients.
Destroy toxins.
What does the selective permeability of the phospholipid bilayer allow?
Allow the passage of all molecules without restriction.
Select certain molecules to pass while preventing others.
Completely block the passage of molecules.
Convert molecules into energy.
What is a primary function of carbohydrates in the body?
Energy production
Regulation of body temperature
Oxygen transport
Hormone production
What type of cholesterol is known as "good cholesterol"?
Low-density lipoprotein (LDL)
High-density lipoprotein (HDL)
Triglycerides
Saturated fatty acids
What is one of the functions of proteins in cells?
Energy storage
Regulation of body tissues and organs
Glucose production
Carbon dioxide transport
What is the main function of transport proteins in facilitated diffusion?
Assist in the movement of specific molecules.
Use ATP to move molecules.
Form hydrophilic pores.
Bind to specific molecules.
What type of transport uses ATP to move molecules against their concentration gradient?
Facilitated diffusion.
Active transport.
Channel proteins.
Passive transport.
What is the function of channel proteins in the cell membrane?
Use ATP to move molecules.
Form hydrophilic pores for the passage of ions or small molecules.
Bind to specific molecules and transport them.
Assist in the movement of specific molecules.
Which components can move laterally within the plasma membrane?
Phospholipids
Proteins
Carbohydrates
Cholesterol
Why is the fluid mosaic model described as a "mosaic"?
Because the components are solid
Because the components are liquid
Because clear patterns are observed on the surface
Because the components do not move
What is the reason the fluid mosaic model is called "fluid"?
Because the components are static
Because the components move and rearrange
Because the components are solid
Because the components do not interact
What is the main function of the plasma membrane in the cell?
Protect the cell from viruses
Maintain homeostasis
Produce energy
Store nutrients
How is the plasma membrane described in relation to its aqueous environment?
Rigid and thick
Flexible and thin
Impermeable and solid
Dense and opaque
What does the selective permeability of the plasma membrane allow?
The entry of all substances
The exit of all substances
The passage of some substances while keeping others out
The production of proteins
