Transport Across Cell Membranes: Interactive Learning Quizzes

Question 1

Which of the following is NOT a form of passive transport?

Accepted Answer

Active transport

Answer

Diffusion

Answer

Osmosis

Answer

Facilitated diffusion

Question 2

What is the primary role of carrier proteins in facilitated diffusion?

Accepted Answer

Bind to the substance being transported and help it cross the membrane.

Answer

Create a channel through the membrane for the substance to pass through.

Answer

Use energy to actively transport the substance against its concentration gradient.

Answer

Block the passage of the substance across the membrane.

Question 3

Which of the following is NOT a type of passive transport?

Accepted Answer

Active transport

Answer

Diffusion

Answer

Osmosis

Answer

Facilitated diffusion

Question 4

Which of the following is NOT a function of proteins in cell membranes?

Accepted Answer

Storing energy for the cell.

Answer

Facilitating the transport of substances.

Answer

Recognizing and binding to specific molecules.

Answer

Providing structural support to the membrane.

Question 5

Which of the following is the primary mechanism by which cells take in large particles?

Accepted Answer

Endocytosis

Answer

Diffusion

Answer

Osmosis

Answer

Exocytosis

Question 6

Which of the following is NOT a type of endocytosis?

Accepted Answer

Exocytosis

Answer

Phagocytosis

Answer

Pinocytosis

Answer

Receptor-mediated endocytosis

Question 7

Which of the following is the function of exocytosis?

Accepted Answer

To release substances from the cell.

Answer

To take in large particles.

Answer

To move substances across the membrane against their concentration gradient.

Answer

To recognize and bind to specific molecules.

Question 8

Which of the following is true about semipermeable membranes?

Accepted Answer

They allow certain substances to pass through while blocking others.

Answer

They allow all substances to pass through freely.

Answer

They allow only water molecules to pass through.

Answer

They allow only small molecules to pass through.

Question 9

What is the term for the movement of water molecules across a selectively permeable membrane?

Accepted Answer

Osmosis

Answer

Diffusion

Answer

Active transport

Answer

Facilitated diffusion

Question 10

What is the key difference between diffusion and facilitated diffusion?

Accepted Answer

Diffusion does not require carrier proteins, while facilitated diffusion does.

Answer

Diffusion is slower than facilitated diffusion.

Answer

Diffusion occurs against a concentration gradient, while facilitated diffusion does not.

Answer

Diffusion transports large molecules, while facilitated diffusion transports small molecules.

Question 11

Which of the following is an example of a semipermeable membrane found in the body?

Accepted Answer

Cell membrane

Answer

Glass

Answer

Plastic wrap

Answer

Metal sheet

Question 12

What is the primary function of sodium-potassium pumps in maintaining the balance of the cell?

Accepted Answer

Establishing and maintaining the resting potential of the cell.

Answer

Controlling the volume of the cell.

Answer

Transporting nutrients into the cell.

Answer

Removing waste products from the cell.

Question 13

What is the main distinction between exocytosis and endocytosis?

Accepted Answer

Exocytosis releases substances from the cell, while endocytosis brings them into the cell.

Answer

Exocytosis requires energy, while endocytosis does not.

Answer

Exocytosis is a form of passive transport, while endocytosis is a form of active transport.

Answer

Exocytosis transports large molecules, while endocytosis transports small molecules.

Question 14

What is the primary role of the cell membrane in the context of transport across the cell?

Accepted Answer

Regulating the movement of substances into and out of the cell.

Answer

Providing structural support to the cell.

Answer

Containing the cell's genetic material.

Answer

Facilitating chemical reactions within the cell.

Question 15

Which of the following substances can pass through a phospholipid bilayer without the assistance of membrane proteins?

Accepted Answer

Water

Answer

Glucose

Answer

Sodium ions

Answer

Potassium ions

Question 16

Which of the following is NOT a mechanism of endocytosis?

Accepted Answer

Exocytosis

Answer

Phagocytosis

Answer

Pinocytosis

Answer

Receptor-mediated endocytosis

Question 17

What is the role of integral membrane proteins in facilitating the transport of polar molecules across the cell membrane?

Accepted Answer

They form channels or pores that allow polar molecules to pass through

Answer

They bind to polar molecules and carry them across the membrane

Answer

They alter the permeability of the membrane to polar molecules

Answer

They do not play a role in the transport of polar molecules

Question 18

How does endocytosis differ from exocytosis?

Accepted Answer

Endocytosis involves the uptake of extracellular substances, while exocytosis involves the release of intracellular substances.

Answer

Exocytosis involves the uptake of extracellular substances, while endocytosis involves the release of intracellular substances.

Answer

Endocytosis and exocytosis both involve the uptake of extracellular substances.

Answer

Endocytosis and exocytosis both involve the release of intracellular substances.

Question 19

What type of transport requires energy to move substances across a cell membrane?

Accepted Answer

Active transport

Answer

Passive transport

Answer

Facilitated diffusion

Answer

Osmosis

Question 20

Which of the following is NOT a type of endocytosis?

Accepted Answer

Exocytosis

Answer

Phagocytosis

Answer

Pinocytosis

Answer

Transcytosis

Question 21

What is the primary difference between osmosis and diffusion?

Accepted Answer

Osmosis involves the movement of water across a selectively permeable membrane, while diffusion involves the movement of all substances across a membrane.

Answer

Diffusion involves the movement of water across a selectively permeable membrane, while osmosis involves the movement of all substances across a membrane.

Answer

Osmosis and diffusion are the same process.

Answer

Osmosis occurs against a concentration gradient, while diffusion occurs down a concentration gradient.

Question 22

What is the main role of ion channels in membrane transport?

Accepted Answer

Providing specific pathways for ions to move across the membrane

Answer

Preventing ion movement across the membrane

Answer

Regulating the concentration of ions inside and outside the cell

Answer

Generating electrical signals across the membrane

Question 23

Which of the following is an example of a hypertonic solution?

Accepted Answer

10% NaCl solution

Answer

0.9% NaCl solution

Answer

Distilled water

Answer

Blood plasma

Question 24

What is the primary function of water channels in the plasma membrane?

Accepted Answer

Facilitating the movement of water into and out of the cell

Answer

Preventing the movement of water across the membrane

Answer

Regulating the concentration of water inside and outside the cell

Answer

Generating electrical signals across the membrane

Question 25

Which of the following is a characteristic of facilitated diffusion?

Accepted Answer

Involves carrier proteins

Answer

Requires energy

Answer

Moves substances against their concentration gradient

Answer

Is an active process

Question 26

How does exocytosis differ from endocytosis?

Accepted Answer

Exocytosis releases substances from the cell, while endocytosis brings substances into the cell.

Answer

Endocytosis releases substances from the cell, while exocytosis brings substances into the cell.

Answer

Exocytosis and endocytosis are the same process.

Answer

Exocytosis requires energy, while endocytosis does not.

Question 27

How does the concentration gradient of a substance influence the direction of passive transport across a cell membrane?

Accepted Answer

Passive transport occurs from an area of high concentration to an area of low concentration.

Answer

Passive transport occurs from an area of low concentration to an area of high concentration.

Answer

Passive transport occurs against the concentration gradient.

Answer

Passive transport occurs only through facilitated diffusion.

Question 28

What is the net movement of water across a semipermeable membrane when the concentration of solutes is higher on one side?

Accepted Answer

Osmosis

Answer

Diffusion

Answer

Endocytosis

Answer

Exocytosis

Question 29

Which of the following processes requires energy to move substances across a cell membrane?

Accepted Answer

Active transport

Answer

Diffusion

Answer

Osmosis

Answer

Endocytosis

Question 30

The movement of large molecules or particles into a cell is called:

Accepted Answer

Endocytosis

Answer

Exocytosis

Answer

Diffusion

Answer

Osmosis

Question 31

The concentration gradient of a substance refers to:

Accepted Answer

The difference in concentration between two areas

Answer

The rate at which a substance can move across a membrane

Answer

The amount of a substance present in a cell

Answer

The type of membrane that a substance can cross

Question 32

The fluid mosaic model of the cell membrane describes the membrane as:

Accepted Answer

A mosaic of lipids and proteins that can move laterally

Answer

A rigid structure composed of lipids and proteins

Answer

A selectively permeable barrier composed of carbohydrates and proteins

Answer

A bilayer of phospholipids with embedded proteins

Question 33

The sodium-potassium pump is an example of:

Accepted Answer

Active transport

Answer

Passive transport

Answer

Endocytosis

Answer

Exocytosis

Question 34

Identify the transport mechanism that does NOT involve the movement of substances down a concentration gradient.

Accepted Answer

Active transport

Answer

Diffusion

Answer

Osmosis

Answer

Facilitated diffusion

Question 35

Diffusion across a cell membrane is driven primarily by:

Accepted Answer

A concentration gradient

Answer

An electrical gradient

Answer

A temperature gradient

Answer

A pressure gradient

Question 36

Cell membranes are NOT responsible for:

Accepted Answer

Cellular metabolism

Answer

Controlling the movement of substances

Answer

Providing structural support

Answer

Protection

Question 37

Aquaporins are specialized membrane proteins responsible for:

Accepted Answer

Water transport

Answer

Ion transport

Answer

Glucose transport

Answer

Amino acid transport

Question 38

Which of the following is NOT a characteristic of passive transport?

Accepted Answer

Requires carrier proteins

Answer

Does not require energy

Answer

Involves movement of substances along a concentration gradient

Answer

Examples include diffusion and osmosis

Question 39

What term describes the net movement of water molecules across a semi-permeable membrane?

Accepted Answer

Osmosis

Answer

Diffusion

Answer

Facilitated diffusion

Answer

Active transport

Question 40

What is the primary role of carrier proteins in facilitated diffusion?

Accepted Answer

To increase the rate of diffusion

Answer

To enable the transport of substances against their concentration gradient

Answer

To decrease the permeability of the membrane

Answer

To prevent the entry of harmful substances

Question 41

Which of the following processes requires energy input to move substances across a membrane?

Accepted Answer

Active transport

Answer

Diffusion

Answer

Osmosis

Answer

Passive transport

Question 42

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Energy production

Answer

Protection

Answer

Transport

Answer

Communication

Question 43

Diffusion is driven by which factor?

Accepted Answer

Concentration gradient

Answer

Electrical gradient

Answer

Pressure gradient

Answer

Temperature gradient

Question 44

Distinguish between osmosis and diffusion:

Accepted Answer

Osmosis involves water movement across a selectively permeable membrane, while diffusion involves solute movement across a permeable membrane.

Answer

Diffusion involves water movement across a selectively permeable membrane, while osmosis involves solute movement across a permeable membrane.

Answer

Osmosis and diffusion are identical processes.

Question 45

Identify an example of active transport:

Accepted Answer

Transport of sodium ions against their concentration gradient

Answer

Movement of carbon dioxide out of the cell

Question 46

Endocytosis serves which purpose in cell function?

Accepted Answer

Internalization of nutrients, macromolecules, and particles

Answer

Secreting waste products out of the cell

Question 47

Which of the following processes does NOT involve the movement of molecules across a cell membrane?

Accepted Answer

Gene expression

Answer

Diffusion

Answer

Osmosis

Answer

Active transport

Question 48

Which of the following describes the movement of water molecules from an area of low solute concentration to an area of high solute concentration?

Accepted Answer

Osmosis

Answer

Diffusion

Answer

Active transport

Answer

Endocytosis

Question 49

Which type of membrane transport requires the use of energy to move molecules against their concentration gradient?

Accepted Answer

Active transport

Answer

Passive transport

Answer

Facilitated diffusion

Answer

Osmosis

Question 50

Which process results in the intake of extracellular material into a cell?

Accepted Answer

Endocytosis

Answer

Exocytosis

Answer

Diffusion

Answer

Active transport

Question 51

Which of the following describes the release of material from a cell?

Accepted Answer

Exocytosis

Answer

Endocytosis

Answer

Diffusion

Answer

Active transport

Question 52

Which of the following accurately describes passive transport?

Accepted Answer

The movement of molecules from a high concentration area to a low concentration area, without energy requirement.

Answer

The movement of molecules from a low concentration area to a high concentration area, requiring energy.

Answer

The movement of molecules against a concentration gradient, requiring energy.

Answer

The movement of molecules through a semi-permeable membrane, regardless of concentration.

Question 53

Which of these is an example of facilitated diffusion?

Accepted Answer

Glucose entering a cell

Answer

Sodium ions exiting a cell

Answer

Oxygen crossing a cell membrane

Answer

Water passing through a selectively permeable membrane

Question 54

What is the primary role of sodium-potassium pumps in maintaining a neuron's resting potential?

Accepted Answer

Actively transporting sodium ions out of and potassium ions into the cell.

Answer

Passively transporting sodium ions into and potassium ions out of the cell.

Answer

Creating an electrochemical gradient across the cell membrane.

Answer

Preventing ions from leaking across the cell membrane.

Question 55

Which type of cell is most vulnerable to changes in osmotic pressure?

Accepted Answer

Red blood cell

Answer

Muscle cell

Answer

Nerve cell

Answer

Plant cell

Question 56

What is the function of channel proteins in passive transport?

Accepted Answer

To create pores in the membrane for the passage of specific molecules.

Answer

To actively transport molecules against a concentration gradient.

Answer

To regulate the movement of molecules across the membrane.

Answer

To prevent the movement of molecules across the membrane.