Cell Membrane Quiz

What is the structure of the cell membrane primarily composed of?

• Protein monolayer

• Phospholipid bilayer

• Carbohydrate layer

• Phospholipid monolayer

Label the parts of the cell membrane

a

b

c

hydrophobic phosphate head

protein channel

hydrophilic phosphate heads

hydrophilic hydrocarbon tail

carbohydrate channel

hydrophobic hydrocarbon tails

Why are cell membranes semipermeable?

• phospholipid bilayer structure is loose enough for small particles to pass through

• Cell membranes allow all substances to pass freely.
• Cell membranes are made entirely of proteins.
• Cell membranes are impermeable to all substances.

What is selective permeability?

• The ability to allow all substances to pass

• The ability to block all substances

• The ability to allow some substances to pass while blocking others

• The ability to allow only water to pass

What is Brownian motion?

• The random movement of particles in a fluid

• The organized movement of particles in a solid

• The random movement of particles in a solid

• The organized movement of particles in a fluid

What is the role of Brownian motion in diffusion?

• It provides energy for diffusion

• It provides the random movement and collision of particles

• It gives the direction of movement to the particles

• It stops high concentration molecules from flowing

What remains unchanged at dynamic equilibrium during diffusion?

• Temperature

• Concentration

• Volume

• Pressure

• Direction of movement

What does the term "dynamic" in dynamic equilibrium refer to?

• The constant movement of particles

• The shifting temperature of the fluid

• That the molecules explode once in equilibrium

• That the equilibrium of molecules shifts from inside to outside the cell

​ (a)   is the proportion of a substance in an area,​ and a (b)   is a measure of the increase/decrease of a property/substance from one point to another

• Concentration
• Gradient
• Inclination
• Spectrum
• Similitude

Tags

NGSS.HS-PS1-5

What does the 'fluid' in 'fluid mosaic model' refer to?

• The solution/fluid surrounding cell membranes.

• The high permeability of the membrane that allows water to move through the bilayer.

• The presence of water molecules embedded in the membrane.

• The ability of phospholipids to move independently of each other in the membrane bilayer.