Ib Biology Membrane and Membrane Transport

Which of the following is NOT part of the cell membrane?

• Lipids
• Carbohydrates
• Proteins
• Nucleic Acids

Which of the following is responsible for getting large or charged (polar) molecules across the cell membrane?

• E
• B
• C
• D

Phospholipid tails are...

• Hydrophobic lipids
• Hydrophilic lipids
• hydrophobic phosphate
• hydrophilic phosphate

What is the name for a molecule that has a polar head region and a hydrophobic tail region?

• Bihydrophicity
• Amphipathic
• Hydrophilic
• Dipolarity

How many layers of phospholipids is the lipid bilayer?

• 1
• 2
• 3
• 4

The plasma membrane is best described as ___________ permeable.

• selectively permeable

• completely permeable

• impenetrable

• unimportant

The _________________ model describes the structure of the plasma membrane.

• fluid mosaic

• double helix

• Davson-Danielli

• Gorter and Grendel

What does G represent?

• phosphlipids

• carbohydrates

• membrane proteins

• cholesterol

During diffusion, substances move

• down a concentration gradient.

• up a concentration gradient.

• along a concentration gradient

• From a low concentration to a higher concentration

_____________ diffusion can be used by the cell to move larger polar molecules and ions across the membrane.

• facilitated

• simple

• complex

• helper