A phospholipid has 2 parts. What are they called?

Hydrophilic Head, Hydrophobic Tail

Hydrophobic Head, Hydrophilic Tail

What issues were found with the Davson-Danelli model that meant the Singer - Nicholson model was eventually accepted? Select all that apply.

Freeze etched electron micrographs showed globular structures crossing the membranes

Membrane proteins were shown to have hydrophobic sections.

Fluorescent marking of membrane proteins showed they could move around within the membrane

Electron micrographs showed a light band sandwiched between 2 dark bands

There were twice as many phospholipids in red blood cells than were needed to make a monolayer membrane.

This freeze-etched electron micrograph of the membrane suggested which piece of evidence that helped to falsify the Davson-Danelli model? Select all that apply.

Membrane proteins appear to cross through the membrane

Membrane proteins are not even distributed across membranes

Membrane proteins make an even layer on the outside of membranes

A human organ is being prepared for transplant. In what type of solution must it be bathed?

D. A solution with the same osmolarity as the organ tissue

C. Pure water containing no solutes

Dialysis membrane was set up to model digestion and absorption in the small intestine. What is a limitation of this model?

A. There can be no active transport.

B. Maltose will pass through the membrane.

C. Lipase should be present with protein.

D. The membrane is not permeable to starch.

The salt concentration inside an animal cell is 1.8 %. The salt concentration in the surrounding medium becomes 5 %. What will be the likely response?

D. The cell will shrink from loss of water.

A. The cell will gain water from the medium.

B. The cell will lose salt to the medium.

C. The cell will remain unchanged.

What do diffusion and osmosis have in common?

C. They are passive transport mechanisms.

A. They only happen in living cells.

B. They require transport proteins in the membrane.

D. Net movement of substances is against the concentration gradient

What feature of cell membranes allows endocytosis to occur?

A. Fluidity of phospholipid bilayer

C. Presence of carrier proteins

Why do crop plants dry out when a field is irrigated with water contaminated by sea water?

D. The plants lose water by osmosis.

A. The plants lose water by active transport.

B. The plants gain salt by osmosis.

C. The plants gain salt by diffusion.

IB Biology

Authored by Charles Martinez

Biology

11th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What forms the channels and pumps in the phospholipid bilayer?

carbohydrates

proteins

hydrophilic heads

lipids

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

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

Lipids

Carbohydrates

Proteins

Nucleic Acids

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The function of the plasma membrane is....

to regulate what enters and leaves the cell.

fight bacteria and viruses that enter the cell.

provide rigid support and protection to the cell.

make sure each cell can move

Hydrophilic means...

water-loving

water-fearing

nonpolar

lipid soluble

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Hydrophobic region of the cell membrane?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is NOT TRUE about the cell membrane

It controls what enters and leaves the cell

Semipermeable

Phospholipid bilayer

Contains digestive enzymes

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is embedded in the phospholipid bilayer?

proteins

salt

water

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IB Biology

What forms the channels and pumps in the phospholipid bilayer?

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

The function of the plasma membrane is....

Hydrophilic means...

Hydrophobic region of the cell membrane?

What is NOT TRUE about the cell membrane

What is embedded in the phospholipid bilayer?

True or false: Regulating what enters and leaves the cell helps the cell maintain homeostasis.

A phospholipid has 2 parts. What are they called?

A ______________ is composed of a phosphate and glycerol head and 2 fatty acid chain tails.

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