Cell Membrane Structure and Transport Pre-Test

What is the main component of the cell membrane?

• proteins

• nucleic acids

• phospholipids

• carbohydrates

Describe the structure of the phospholipid bilayer.

• The phospholipid bilayer consists of two layers of phospholipid molecules.

• The phospholipid bilayer is a single layer of protein molecules.

• The phospholipid bilayer is made of three layers of phospholipid molecules.

• The phospholipid bilayer is composed of carbohydrates and lipids.

What is the process by which molecules move across the cell membrane without the use of energy?

• Active transport

• Endocytosis

• Passive diffusion

• Facilitated diffusion

Give an example of passive transport.

• Active transport

• Osmosis

• Endocytosis

• Diffusion

What is the main difference between passive and active transport?

• Passive transport does not require energy, while active transport requires energy in the form of ATP.

• Passive transport is faster than active transport

• Active transport does not involve the movement of molecules

• Passive transport requires more energy than active transport

Explain how active transport differs from passive transport.

• Passive transport requires energy to move substances across the cell membrane

• Active transport moves substances from an area of high concentration to an area of low concentration

• Active transport moves substances with the help of osmosis

• Active transport requires energy to move substances across the cell membrane.

What is the role of transport proteins in active transport?

• Prevent the movement of molecules across the cell membrane

• Facilitate the movement of molecules or ions across the cell membrane

• Create a barrier that blocks the cell membrane

• Convert molecules into energy within the cell membrane

Explain the process of diffusion.

• Diffusion is the movement of particles from an area of low concentration to an area of even lower concentration.

• Diffusion is the movement of particles from an area of high concentration to an area of even higher concentration.

• Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

• Diffusion is the movement of particles from an area of low concentration to an area of high concentration.

What is the movement of water across a selectively permeable membrane called?

• Diffusion

• Osmosis

• Photosynthesis

• Active transport

How does osmosis differ from diffusion?

• Osmosis and diffusion are the same process.

• Osmosis involves the movement of particles, while diffusion involves the movement of water molecules.

• Osmosis involves the movement of water molecules, while diffusion involves the movement of particles.

• Osmosis only occurs in plant cells, while diffusion only occurs in animal cells.