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Transport Across Membranes Quiz

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Questions and Answers

What is the structure of the cell membrane according to the fluid-mosaic model?

Double layer of phospholipid molecules

Single layer of phospholipid molecules

Phospholipid bilayer interspersed with proteins and other substances (correct)

Protein layer with interspersed phospholipids

What do the hydrophilic heads of the phospholipid molecules in the cell membrane point outward towards?

Water on each side (correct)

Lipid-soluble substances

The centre of the membrane

Hydrophobic tails

What is the function of the phospholipid bilayer in the cell membrane?

Allows lipid-soluble substances to enter and leave (correct)

Forms a barrier against all substances

Facilitates the movement of water-soluble substances

Prevents water-soluble substances from entering and leaving

What is the main process through which water moves across a cell membrane?

Osmosis Signup and view all the answers

Which process requires energy to move substances across the cell membrane against their concentration gradient?

Active transport Signup and view all the answers

What is the structure of the cell membrane according to the fluid-mosaic model?

Phospholipid bilayer interspersed with proteins Signup and view all the answers

What is the primary function of the phospholipid bilayer in the cell membrane?

Allows lipid-soluble substances to enter and leave Signup and view all the answers

Which process involves the movement of water across a selectively permeable membrane?

Osmosis Signup and view all the answers

What distinguishes facilitated diffusion from simple diffusion?

Requires the assistance of transport proteins Signup and view all the answers

Which statement best describes the function of active transport in the cell membrane?

Moves substances against their concentration gradient Signup and view all the answers

Transport Across Membranes Quiz

Choose a study mode

Podcast

Questions and Answers

What is the structure of the cell membrane according to the fluid-mosaic model?

What do the hydrophilic heads of the phospholipid molecules in the cell membrane point outward towards?

What is the function of the phospholipid bilayer in the cell membrane?

What is the main process through which water moves across a cell membrane?

Which process requires energy to move substances across the cell membrane against their concentration gradient?

What is the structure of the cell membrane according to the fluid-mosaic model?

What is the primary function of the phospholipid bilayer in the cell membrane?

Which process involves the movement of water across a selectively permeable membrane?

What distinguishes facilitated diffusion from simple diffusion?

Which statement best describes the function of active transport in the cell membrane?

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