Diffusion Test

The diagram represents a cell. Which structure is responsible for the passage of materials into and out of the cell?

• A

• B

• C

• D

Answer explanation

Structure A, also known as the cell membrane, is responsible for the passage of materials into and out of the cell.

Tags

NGSS.MS-LS1-2

The diagram represents a plant cell found in tap water as seen with a compound light microscope. Which diagram best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?

• 
• 
• 
• 

Tags

NGSS.HS-LS1-3

The diagram represents some cells on a microscope slide before and after a substance was added to the slide. In the Diffusion Through the Membrane Lab, the model cell allowed certain substances to pass through based on what characteristic of the diffusing substance?

• size

• shape

• color

• temperature

Answer explanation

The diffusing substance's size determines whether it can pass through the model cell's membrane.

The diagram represents a model cell setup. The locations of three different substances are indicated in the diagram. Which statement best describes what will most likely happen after several minutes?

• The contents of the model cell will change color

• The liquid outside of the model cell will change color

• The model cell will shrink

• The model cell will rupture

Answer explanation

After several minutes, the contents of the model cell will change color.

Tags

NGSS.MS-LS1-2

The accompanying diagram represents movement of a large molecule across a membrane. Which process is best represented in this diagram?

• active transport

• diffusion

• protein building

• gene manipulation

Answer explanation

The diagram represents active transport, where a large molecule is moved across a membrane against its concentration gradient with the help of a protein.

In an experiment, students placed a dialysis bag containing 100 mL of a starch-water mixture in a beaker of water. When they removed the dialysis bag the next day and measured the volume of the contents. They found that there were now 125 mL of starch-water mixture. To measure the volume of the starch-water mixture in the dialysis bag, the students should have used

• meterstick

• triple beam balance

• test tube

• graduated cylinder

Answer explanation

To measure the volume of the starch-water mixture in the dialysis bag, the students should have used a graduated cylinder. It is the most accurate tool for measuring liquid volume.

Tags

NGSS.MS-PS1-2

After two hours, the color of the liquid in the beaker did not change. This shows that

• glucose moved from the artificial cell to into the beaker

• starch did not pass out of the artificial cell

• starch was digested into glucose in the artificial cell

• glucose molecules combined to produce starch in the artificial cell

Answer explanation

The color of the liquid in the beaker did not change after two hours, indicating that starch did not pass out of the artificial cell.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This laboratory setup is used to demonstrate

• active transport

• carbohydrate synthesis

• protein building

• diffusion

Answer explanation

This laboratory setup demonstrates diffusion, the process by which molecules move from an area of high concentration to an area of low concentration.

In the accompanying diagram, the dark dots indicate small molecules. These molecules are moving out of the cells, as indicated by the arrows. The number of dots inside and outside of the two cells represents the relative concentrations of the molecules inside and outside of the cells. ATP is being used to move the molecules out of the cell by

• cell A only

• cell B only

• cell A and B

• neither cell A or B

Answer explanation

ATP is being used to move the molecules out of cell A only.

Tags

NGSS.MS-LS1-2

The diagram represents a leaf cell and 2 different molecules used in the process of glucose synthesis. Molecules 1 and 2 enter the cell and glucose leaves the cell by the process of

• respiration

• digestion

• active transport

• diffusion

Answer explanation

Glucose is synthesized in the leaf cell through the process of diffusion, where molecules 1 and 2 enter the cell and glucose leaves the cell.

Tags

NGSS.HS-LS1-6