Cell Membrane Quiz

What separates the inside of the cell from the outside environment?

• The nucleus

• The cell membrane

• The mitochondria

• The endoplasmic reticulum

What is the cell membrane bilayer composed of?

• Omega-3 fatty acids

• Cholesterol

• Poly unsaturated fats

• Phospholipids

Which statement below best describes the structure of the cell membrane?

• It is a single layer of phospholipids

• A double layer of phospholipids with the heads facing each other and the tails on the outside.

• A double layer of phospholipids with the heads facing out and the tails facing toward each other.

• Several folded layers of membrane material with ribosomes attached across the surface.

The “doors” through the cell membrane are made of what material?

• Proteins

• Lipids

• Carbohydrates

• Water

When a cell needs to bring in materials from outside that will not easily pass through the membrane, it uses ________________ to let them in.

• Hydrophobic tails

• Protein Channels

• Phospholipids

• Hydrophilic heads

• Endocytosis

What are the three types of passive transport used by cells?

• Osmosis, endocytosis, and pinocytosis

• Endocytosis, pinocytosis, and Phagocytosis

• Simple diffusion, facilitated diffusion, and osmosis

• Exocytosis, pinocytosis, and facilitated diffusion

When a material enters the cell by diffusion, the material is moving from an area of ________________ concentration to an area of ________________ concentration.

• Low, high

• Resting, active

• High, low

• Equal, equal

• No, some

How does raising the temperature of a material affect the speed of diffusion?

• It slows it down.

• It has no affect.

• It stays the same.

• It speeds it up.

When the cell membrane uses protein channels to move materials from an area of high concentration to an area of low concentration, this process is called __________.

• Active transport

• Osmosis

• Diffusion

• Facilitated diffusion

______________ is the movement of water molecules from an area of high concentration to an area of low concentration.

• Active transport

• Osmosis

• Diffusion

• Facilitated diffusion