Unit 2 Cells

What is a difference between prokaryotic and eukaryotic cells?

• Prokaryotic cells are more complex and evolved later on

• Eukaryotic cells tend to be smaller than prokaryotic cells.

• Most prokaryotic cells have a nucleus.

• Only eukaryotic cells have membrane-bound organelles.

Which molecule makes up the majority of eukaryotic cells bilayer membrane?

• proteins

• carbohydrates

• phospholipids

• nucleic acids

Which part of the bilayer is hydrophobic?

• the heads

• the tails

• the middle

• none of these options

Which of these molecules could pass easily through the cell membrane?

• A small nonpolar molecule like O2.

• A small polar molecule like H2O.

• A large polar molecule like glucose or an amino acid.

• All of these

Cell membranes have many proteins, each with a different function.  Which class of protein attaches the cell to other, neighboring cells?

• enzyme

• Carrier protein

• recognition protein

• anchoring protein

Which of these accurately describes passive movement along a concentration gradient?

• Movement of molecules from areas of low to high concentration.

• Movement of molecules from areas of high to low concentration

• Movement of molecules between areas of the same concentration

What is the difference between simple diffusion and facilitated diffusion?

• Facilitated diffusion requires ATP, simple does not.

• Facilitated diffusion moves against the concentration gradient, simple moves with it.

• Facilitated diffusion requires the use of a protein channel or transporter, because the target molecule cannot pass through the membrane on its own

• Facilitated diffusion only moves material outside of the cell.  Simple diffusion moves it into the cell

In this diagram, what is the solute?

• the water

• the glucose

• the membrane

• the u-shaped tube

Tags

NGSS.HS-PS1-2

Assume the membrane is selectively permeable for water only.  What direction will the water in the tube flow?

• to the right

• to the left

• back and forth at equal rates

• to the back, to the front

A red blood cell is about 92% water, with the other 8% being other dissolved substances.  What would happen if the red blood cell were placed into a solution of 70% water, 30% salt?

• Water would flow into the red blood cell, causing it to swell and lyse

• Water would flow out of the red blood cell, causing it to shrivel.

• Salt would flow out of the red blood cell into the solution

• a.       The red blood cell would not be affected.

Tags

NGSS.HS-LS1-3