1.3-1.4 IB Cell Membrane and Transport

The picture is an example of...

• active tranport

• passive transport

• diffusion

• osmosis

Answer explanation

Because the particles are moving AGAINST the concentration gradient.

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

• E

• B

• C

• D

Answer explanation

That would be a channel protein.

Hydrophobic region of the cell membrane?

• E

• B

• C

• A

Answer explanation

Yes, the hydrophobic fatty acid tails of the phospholipids.

Which form of active transport is being shown? (Inside of the cell is tan colored)

• Facilitated Diffusion

• Exocytosis

• Endocytosis

• Receptor-mediated endocytosis

Answer explanation

The vesicle is ENTERING the cell so the prefix 'endo' is used.

Which of the following functions as a recognition site for interactions between cells?

• Phospholipids

• Cholesterol

• Fatty acids

• Glycolipids

Answer explanation

Usually the 'glyco' or carbohydrate part is involved in these interactions.

Which of the following is the driving force for facilitated diffusion?

• Concentration gradient

• ATP hydrolysis

• ADP hydrolysis

• Phosphorylation

Answer explanation

No mater what , diffusion goes WITH the concentration gradient.

What type of transport is this?

• Endocytosis

• Diffusion

• Exocytosis

• Osmosis

Answer explanation

The vesicle is LEAVING the cell so the prefix 'exo' applies.

What type of organelle is used during endocytosis and exocytosis?

• Endoplasmic Reticulum

• Golgi Body

• Vesicle

• Lysosome

Answer explanation

Vesicles are like the envelopes being used to ship the substances out of the cell.

Tags

NGSS.MS-LS1-2

What type of transport is represented by figure "B"?

• Active Transport

• Facilitated Diffusion

• Protein Transport

• Osmosis

Answer explanation

You can tell because the particles are going WITH the concentration gradient, so that is diffusion, but they can't go directly through the membrane so they need a channel or are in other words FACILITATED.

Cell membranes are composed primarily of.....

• nucleotides and nucleosides

• enzymes, electron acceptors, and electron donors

• monosaccharides and diasaccharides

• lipids

Answer explanation

Lipids can make up over 80% o a membrane depending on where the membrane is located.