Active & Passive Transport

What is the primary function of the cell membrane?

• To store genetic information

• To produce energy for the cell

• To separate the internal contents of the cell from the external environment

• To provide structural support to the cell

Tags

NGSS.MS-LS1-2

What is the main structural component of the cell membrane?

• Phospholipid bilayer

• Cholesterol

• Proteins

• Carbohydrates

What is the significance of the phospholipid bilayer's hydrophobic tails?

• They attract water molecules

• They repel water and create a barrier

• They store energy for the cell

• They synthesize proteins

Which molecules provide rigidity to the cell membrane?

• Glycoproteins

• Carrier proteins

• Cholesterol

• Phospholipids

How do nonpolar molecules typically cross the cell membrane?

• Through active transport

• Using channel proteins

• Via facilitated diffusion

• Directly through the lipid bilayer

What is facilitated diffusion?

• Movement of molecules against a concentration gradient using energy

• Spontaneous movement of molecules from lower to higher concentration

• Transport of molecules through a membrane without energy expenditure

• Movement of water molecules through specialized channels

Which process describes the movement of ions through specific channel proteins without energy expenditure?

• Facilitated diffusion

• Endocytosis

• Osmosis

• Active transport

Which type of protein changes shape to transport molecules across the cell membrane?

• Carrier proteins

• Receptor proteins

• Glycoproteins

• Channel proteins

What role do receptor proteins play in the cell membrane?

• They help in the synthesis of lipids

• They assist in the replication of DNA

• They provide structural support

• They receive and transmit signals from outside the cell

Drag and label the parts of the phospholipid bilayer.

a

b

hydrophilic

hydrophobic

Tags

HS-LS1-1