Cell Transport

Substance X is moving into a cell from an area of low concentration. Which of the following is responsible for transporting substance X into the cell?

• Proteins through the process of active transport
• Phospholipids through the process of active transport
• Proteins through the process of passive transport
• Phospholipids through the process of passive transport

In the picture to the right, which area(s) represent(s) the hydrophobic part of the phospholipid membrane?

• Structure A
• Structure B
• Structures A & B
• Neither structure A or B

 A cell with a semi-permeable membrane is placed in an aqueous solution with one type of particle. The cell contains 80% water.  how much salt is located inside of the cell?

• 60%
• 80%
• 20%
• 40%

Describe the movement of "Molecule D" in the apparatus shown to the right over time.

• They will stay in the same place
• They will move across the they are membrane until they are all on side B
• They will move across the membrane until they reach an equilibrium.
• "Molecule D" will move to side A, but "Molecule C" will stay in the same place.

A red blood cell has lost water due to certain changes inside the body.  What causes the water to leave the red blood cell?

• The fluid outside the cell is more concentrated with water, causing the red blood cell to shrink.
• The fluid outside the cell is less concentrated with water, causing the red blood cell to swell.
• The fluid outside the cell is less concentrated with water, causing the red blood cell to shrink.
• The fluid outside the cell is more concentrated with water, causing the red blood cell to swell.

On the diagram below, indicating the direction of osmosis (water)

• Into the cell
• Outside the cell
• Remain the same inside and outside the cell
• Remain the same outside, but not inside

Tags

NGSS.MS-LS2-3

Molecule X moves across a cell membrane by active transport.  Which statement best indicates the relationship that represents diffusion?

• HIgh conc >low
   Uses ATP
• High Conc > Low
  Does not use ATP
• Low Conc > High
  Uses ATP
• Low Conc > High
  Does not use ATP

Eggs were soaked in water and corn syrup, weighed the eggs before and after osmosis occurred.
For Cup A that contained water, before osmosis it weighed 5.5 grams. After the movement of water occurred, Cup A then measured to be 6.5 grams.
Cup B was filled with corn syrup and weighed 5.5 grams before osmosis occurred. After osmosis occurred, it weighed 3.3 grams. 
What is the independent variable?

• The size of the egg
• The direction of osmosis
• The concentration gradients of liquids
• The type of container

Tags

NGSS.MS-LS1-2

The protein moves small molecules and ions across the cell membrane.
For example, ions are moves from the side where there are few ions to the side where there are more ions.
Which best describes this process of moving ions against a concentration difference?

• Facilitated diffusion not requiring energy
• Active transport requiring energy
• Passive transport
• Osmosis

Osmosis occurs when there is a different concentration of solute molecules on each side of the membrane. There is a  beaker containing a 30% salt solution with a plastic bag containing a 10% salt solution. What will happen to the bag after about twenty minutes?

• Salt will move from the bag into the 30% salt solution.
• Salt will move from the 30% salt solution into the bag.
• Water will move from the 30% salt solution into the bag.
• Water will move from the bag into the 30% salt solution.