Cell Transport

A biologist observed a plant cell in a drop of water as shown in diagram A. The biologist added a 10% salt solution to the slide and observed the cell as shown in diagram B.

The change in appearance of the cell resulted from

• more salt moving out of the cell than into the cell

• more salt moving into the cell than out of the cell

• more water moving into the cell than out of the cell

• more water moving out of the cell than into the cell

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NGSS.MS-LS1-2

NGSS.MS-LS1-5

The accompanying diagram represents a cell in water. Formulas of molecules that can move freely across the cell membrane are shown. Some molecules are located inside the cell and others are in the water outside the cell.

Based on the distribution of these molecules, what would most likely happen after a period of time?

• The concentration of O₂ will increase inside the cell.

• The concentration of O₂ will remain the same inside the cell.

• The concentration of CO2 will remain the same inside the cell.

• The concentration of CO2 will decrease outside the cell.

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NGSS.HS-LS2-3

The energy an organism requires to transport materials and eliminate wastes is obtained directly from

• starch

• hormones

• 02

• CO2

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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

An investigation was set up to study the movement of water through a membrane. The results are shown in the diagram below.

Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a water solution in which the salt concentration is much higher than the salt concentration in the red blood cells?

• The red blood cells will absorb water and increase in size.

• The red blood cells will lose water and decrease in size.

• The red blood cells will first absorb water, then lose water and maintain their normal size.

• The red blood cells will first lose water, then absorb water, and finally double in size.

A red onion cell has undergone a change, as represented in the diagram below.

This change is most likely due to the cell being placed in

• distilled water

• salt water

• light

• darkness

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NGSS.MS-LS1-2

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Molecule X moves across a cell membrane by diffusion. Which row in the chart below best indicates the relationship between the relative concentrations of molecule X and the use of ATP for diffusion?

• Row (1)

• Row (2)

• Row (3)

• Row (4)

Base your answers to the following questions on the laboratory setup illustrated below and on your knowledge of biology.

This laboratory setup would most likely be used to demonstrate

• carbohydrate synthesis

• active transport

• diffusion

• dehydration

Base your answer to the following questions on the information below and on your knowledge of biology.

A student prepared four different red blood cell suspensions, as shown in the chart below.

Which suspension would contain red blood cells that would appear wrinkled and reduced in volume?

• A

• B

• C

• D

Tags

NGSS.HS-LS1-3

A substance is most likely to diffuse into a cell when

• it is a large organic food molecule such as protein or starch

• it is enclosed in an organelle such as a vacuole

• the concentration of the substance is greater outside the cell than inside

• the pH of the substance is greater than the pH of the cell