Passive Transport

What is the most important feature of a cell's phospholipid membrane?

• It is rigid

• It is selectively permeable

• It is impermeable

• It is flexible.

Which of the following pictures shows a higher concentration?

• 
• 

Tags

NGSS.HS-PS1-5

Fill in the blank: Diffusion is the movement of molecules from an area of _______ concentration to an area with a lower concentration.

• low

• equal

• high

• no

What is the concentration gradient?

• The difference in concentrations of molecules in two areas

• The movement of water molecules

• The energy required for active transport

• The structure of the cell membrane.

Fill in the blank: The end result of diffusion is an equal concentration, or _______, of molecules on both sides of the membrane.

• imbalance

• equilibrium

• gradient

• diffusion

Tags

NGSS.HS-PS1-5

Fill in the blank: The movement of solutes 'down the concentration gradient' refers to moving from _______ concentration to _______ concentration.

• low, high

• high, low

• equal, unequal

• unequal, equal

Tags

NGSS.HS-PS1-5

What is the role of proteins in the cell membrane?

• Provide energy

• Facilitate diffusion

• Store genetic information

• Create a rigid structure.

Facilitated diffusion is a type of ________ transport.

• active

• passive

• bulk

• primary

Which molecules can easily diffuse across the cell membrane?

• Large polar molecules

• Small nonpolar molecules

• Ions

• Proteins

What is the nature of the lipids that make up cell membranes?

• A) Hydrophilic

• B) Hydrophobic

• C) Neutral

• D) Ionic