Bio Quiz (7.1 & 7.2)

Which of the following are components of the plasma membrane?

Select all that apply!

• Phospholipids

• Glycoacids

• Carbohydrates

• Proteins

When placed in hypertonic solutions, what happens to the cell's mass?

• It increases

• It remains the same

• It decreases

• None of the above

Which of the following best describes omosis?

• Movement of particles from low concentration to high concentration

• Movement of particles requiring additional energy

• Movement of particles facilitated by proteins

• Diffusion of water across a selectively permeable membrane

Which role do integral proteins play in the plasma membrane?

• They facilitate cell communication.

• They serve as protective barriers.

• They determine cell identity and distribute chemical signals.

• They stretch across the membrane to transport substances.

What effect would a sudden increase in cholesterol have on the fluidity of a cell's plasma membrane?

• The fluidity would increase, making the membrane more flexible.

• The fluidity would decrease, making the membrane more rigid.

• The fluidity would remain unchanged.

• The fluidity would lead to the destruction of the membrane.

How do carbohydrates on the plasma membrane contribute to cell signaling?

• By providing structural support to the membrane.

• By facilitating the transport of molecules across the membrane.

• By regulating the fluidity of the membrane.

• By helping cells identify and interact with each other.

What characterizes hypotonic solutions?

• Lower concentration of solutes than the cytoplasm

• Higher concentration of solutes than the cytoplasm

• Same concentration of solutes as the cytoplasm

• Dynamic equilibrium

Which component of a phospholipid is attracted to water?

• The hydrophobic tails.

• The entire molecule.

• The hydrophilic head.

• The lipid core.

When a bottle of perfume is sprayed in one corner of a room, what is the process called when the scent spreads throughout the room?

• Osmosis - The movement of particles from lower concentrations to higher concentrations

• Diffusion - The movement of particles from higher concentrations to lower concentrations

• Diffusion - The movement of particles from lower concentrations to higher concentrations

• Diffusion - The movement of particles facilitated by integral protein

Which of the following best describes the main difference between integral and peripheral proteins in the plasma membrane?

• Integral proteins are located only on the exterior surface, while peripheral proteins are found throughout the membrane.

• Integral proteins stretch across the membrane and transport materials, while peripheral proteins are found on the exterior and interior surfaces.

• Both integral and peripheral proteins are embedded within the lipid bilayer.

• Integral proteins provide structural support, while peripheral proteins are involved in energy production.