Cell Membrane Transport Quiz

What will happen to an animal cell placed in a hypertonic solution?

• Water will move out of the cell causing it to shrivel

• Water will move in to the cell causing it swell

• Water will move in and out of the cell equally, maintaining the cell size and shape

• Nothing will happen to the cell

Answer explanation

In a hypertonic solution, the concentration of solutes outside the cell is higher than inside. This causes water to move out of the cell, leading to cell shrinkage or shriveling.

Tags

NGSS.HS-LS1-3

What is the function of protein channels in the cell membrane?

• To store genetic information

• To facilitate the transport of molecules

• To produce energy

• To synthesize proteins

Answer explanation

Protein channels in the cell membrane facilitate the transport of molecules across the membrane, allowing essential substances to enter or exit the cell, which is crucial for maintaining cellular function.

Which type of cellular transport requires ATP to move substances across the cell membrane?

• Osmosis

• Passive transport

• Active transport

• Diffusion

Answer explanation

Active transport is the type of cellular transport that requires ATP to move substances against their concentration gradient across the cell membrane, unlike osmosis, passive transport, and diffusion, which do not require energy.

Which of the following are types of ACTIVE transport? (Select all that apply)

• Facilitated Diffusion

• Phagocytosis

• Osmosis

• Sodium-Potassium Pump

• Exocytosis

Answer explanation

Active transport requires energy to move substances against their concentration gradient. Phagocytosis, the Sodium-Potassium Pump, and Exocytosis are all forms of active transport, while Facilitated Diffusion and Osmosis are passive processes.

How does the cell membrane contribute to homeostasis?

• By producing energy

• By regulating the entry and exit of substances

• By storing nutrients

• By breaking down waste

Answer explanation

The cell membrane maintains homeostasis by regulating the entry and exit of substances, ensuring that essential nutrients enter the cell while waste products are removed, thus maintaining a stable internal environment.

Tags

NGSS.MS-LS1-2

In osmosis, water moves towards an area with:

• Lower concentration of dissolved solutes

• Higher concentration of dissolved solutes

• Higher concentration of water

• No dissolved solutes

Answer explanation

In osmosis, water moves towards the area with a higher concentration of dissolved solutes. This is because water naturally flows to dilute the solutes, balancing the concentration on both sides of a membrane.

Moving WITH or DOWN the concentration gradient means...

• Moving from an area of LOW concentration to an area of HIGH concentration

• Moving between two compartments with EQUAL concentrations

• Moving from an area of HIGH concentration to an area of LOW concentration

• The movement of water across the cell membrane

Answer explanation

Moving WITH or DOWN the concentration gradient refers to the process of diffusion, where substances move from an area of HIGH concentration to an area of LOW concentration, seeking equilibrium.

Which of the following statements about diffusion across the cell membrane is INCORRECT?

• Only small, nonpolar molecules are transported across the membrane via diffusion

• Diffusion describes the movement of molecules directly through the phospholipid bilayer

• Diffusion involves the movement of molecules from an area of high concentration to an area of low concentration.

• Diffusion requires the use of channel proteins, but not cellular energy

Answer explanation

The statement is incorrect because diffusion does not require channel proteins; small, nonpolar molecules can pass directly through the phospholipid bilayer without the need for proteins or energy.

Passive transport is the movement of molecules across the cell membrane from an area of high concentration to an area of low concentration without the use of cellular energy.

• True

• False.

Answer explanation

True. Passive transport allows molecules to move from high to low concentration without using energy, as described in the question.

Ions are able to pass directly through the phospholipid bilayer.

• True

• False

Answer explanation

Ions cannot pass directly through the phospholipid bilayer due to their charge and size. The bilayer is hydrophobic, making it impermeable to charged particles, hence the correct answer is False.