Answers FL-2002040-MJ Comprehensive Science 1 CRLab: Exploring Cells

Cellular Interactions with the Environment Answers

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A scientist put red blood cells in water that contained salt. Over time, the red blood cells burst. What is most likely true?

The concentration of water inside the cell was greater than in the salt water.

There was a higher concentration of salt in the water than in the cells.

There was a lower concentration of salt in the water than in the cells.

The concentration of water in the cells and salt water were equal.

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Which substance moves by the process of osmosis?

oxygen

DNA

water

carbon dioxide

The image on the left shows a normal red blood cell, and the image on the right shows a cell that has been put into a new solution. The circles represent the salt in the solutions.

The cell membrane uses energy to move water into the cell from low water concentration to high water concentration.

The water molecules move by osmosis into the cell from low water concentration to high water concentration.

The water molecules move by osmosis into the cell from high water concentration to low water concentration.

The cell membrane uses energy to move water out of the cell from low water concentration to high water concentration.

Which process moves molecules and has these traits?–requires no energy–moves from high concentration to low concentration–moves from uneven distribution to even distribution–can occur when there is no membrane

scattering

diffusion

osmosis

dissolving

The image shows particles of salt dissolved in water.

Salt particles will move toward the left through diffusion.

Salt particles will move toward the left through osmosis.

Salt particles will move toward the right through diffusion.

Salt particles will move toward the right through osmosis.

Which best models osmosis?

water inside a rubber balloon

an ice cube melting into a puddle

water dripping through a coffee filter

water freezing into an ice cube

The picture shows molecules on one side of a permeable membrane.

There will be more molecules on the right side than the left side of the membrane.

All the molecules will be on the right side of the membrane.

There will be more molecules on the left side than the right side of the membrane.

There will be an equal number of molecules on each side of the membrane.

Which statement describes the movement of water when a cell swells and bursts due to osmosis?

Water went into the cell because the concentration of water inside the cell was lower than the concentration outside the cell.

Water went out of the cell because the concentration of water inside the cell was higher than the concentration outside the cell.

The cell membrane used energy to move water into the cell because there was not enough water inside the cell

The cell membrane used energy to move water out of the cell because there was too much water inside the cell

A student places four identical cells into four different liquids.CellDescription of LiquidWSaltier than the cellXLess salty than the cellYEqually as salty as the cellZPure water with no saltsOver time, which cell will look the smallest?

cell W

cell X

cell Y

cell Z

a highera lowerthe same

a higher

a lower

the same

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Cellular Interactions with the Environment Answers

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