Cell Transport Quiz

What type of molecules is the cell membrane mainly made of?

• Water

• Nucleic acids

• Carbohydrates

• Phospholipids

Answer explanation

The cell membrane is primarily composed of phospholipids, which form a bilayer that provides structure and regulates the movement of substances in and out of the cell. Other molecules like proteins and carbohydrates are also present, but phospholipids are the main component.

Tags

NGSS.MS-LS1-2

What is the main difference between active and passive transport?

• Active transport requires energy, passive transport doesn’t

• Passive transport requires energy, active transport doesn’t

• Active transport requires a membrane, passive transport doesn’t

• Passive transport requires a membrane, active transport doesn’t

Which type of passive transport uses transport proteins to transport large molecules such as glucose through the membrane?

• Osmosis

• Diffusion

• Endocytosis

• Facilitated diffusion

Answer explanation

Facilitated diffusion is the type of passive transport that uses transport proteins to help move large molecules like glucose across the cell membrane, unlike osmosis and diffusion which involve smaller molecules.

During passive transport, molecules move with the concentration gradient. This is from…

• Low to high concentration

• High to low concentration

• Left to right concentration

• Right to left concentration

Answer explanation

During passive transport, molecules naturally move from areas of high concentration to areas of low concentration, following the concentration gradient. Therefore, the correct answer is 'High to low concentration'.

Which of these is not a form of passive transport?

• Exocytosis

• Diffusion

• Osmosis

• Facilitated Diffusion

Answer explanation

Exocytosis is not a form of passive transport; it is an active process where cells expel materials. In contrast, diffusion, osmosis, and facilitated diffusion are all passive transport methods that do not require energy.

What type of molecules are embedded in the cell membrane and help with cell transport?

• Water

• Nucleic acids

• Proteins

• Carbon dioxide

Answer explanation

Proteins are embedded in the cell membrane and play a crucial role in cell transport by facilitating the movement of substances in and out of the cell, making them essential for cellular function.

Tags

NGSS.MS-LS1-2

Which of the following correctly describes endocytosis?

• Large molecules enter a cell by forming a vesicle out of the cell membrane

• Large molecules leave a cell when a vesicle collides with the cell membrane

• Small molecules move into the cell’s nucleus

• Small molecules move out of the cell’s nucleus

Answer explanation

Endocytosis is the process where large molecules enter a cell by the cell membrane folding inward to form a vesicle. This correctly describes how substances are taken into the cell, making the first choice accurate.

Tags

NGSS.MS-LS1-2

What is cell transport?

• When cells travel to where they are needed in living organisms

• When molecules move in and out of cells across the plasma membrane

• When molecules ride through the blood to get to the cells that need those materials

• When cells are zapped to a new location

Answer explanation

Cell transport refers to the movement of molecules in and out of cells across the plasma membrane, which is essential for maintaining cellular function and homeostasis.

What type of molecules move from high to low concentration during osmosis?

• Water molecules

• Oxygen molecules

• Sugar molecules

• Proteins

Answer explanation

During osmosis, water molecules move from an area of high concentration to an area of low concentration. This process helps balance solute concentrations on both sides of a membrane, making water the correct answer.

Which of the following correctly describes the structure of the cell membrane?

• Jigsaw puzzle model - Pieces of the cell membranes connect to form a jigsaw puzzle. Each piece is precisely arranged, creating a rigid and immovable barrier around the cell.

• Fluid mosaic model - The cell membrane is flexible and the molecules that make it up can move around.

• Stained glass model - The cell membrane is like a stained glass window, it is a colorful and ornate shell surrounding the cell.

• Invisible force field model - The cell membrane works like an invisible force field, repelling unwanted substances from the cell.