Unit 4 Review: Homeostasis

A cell with a 10% salt concentration is placed into a beaker that contains a 20% salt concentration. The cell shrinks, as shown in the diagram below.

Which part of the cell controls the movement of substances?

• mitochondria

• cell membrane

• chloroplast

• nucleus

Tags

NGSS.MS-LS1-2

Which scenario below could be used to represent how a cell uses active transport to move molecules across a membrane?

• a fish swimming upstream

• a child riding a bike down a hill

• wind blowing a sailboat in the ocean

• a car driving through a mountain tunnel

A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?

• They will swell because water will move into them.

• They will swell because salt will move into them.

• They will shrink because water will move out of them.

• They will shrink because salt will move out of them.

Tags

NGSS.HS-LS2-3

Which uses energy to maintain cellular homeostasis?

• passive transport of ions into a cell

• movement of a solute from low to high concentration

• movement of a solute from high to low concentration

• water flowing into a cell until it reaches the same concentration as water surrounding the cell

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NGSS.HS-LS1-7

How does the plasma membrane help the cell?

• provides a rigid shape and size

• separates DNA from the rest of the cell

• allows substances to move into and out of the cell

• contains pigments to protect the cells from sunlight

Tags

NGSS.MS-LS1-2

Why does active transport require energy?

• Materials are moved from low concentration to low concentration against the gradient.

• Materials are moved from low concentration to high concentration against the gradient.

• Materials are moved from high concentration to low concentration against the gradient.

• Materials are moved from high concentration to high concentration against the gradient.

Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?

• Substances are moving rapidly across the cell membrane.

• ATP is being rapidly consumed near the cellular membrane.

• Substances are moving from high to low concentrations.

• Substances are moving through channels in the cell membrane.

If a solution outside a cell is more concentrated than the environment inside the cell, what is the term given for the solution outside the cell?

• isotonic

• hypotonic

• hypertonic

• equilibrium

Single-celled organisms move substances from low concentrations to high concentrations to maintain homeostasis. What is this process called?

• passive transport

• active transport

• osmosis

• diffusion

Released energy from which molecule allows active transport to move substances across cell membranes?

• ADP

• AMP

• ATP

• NAD

Tags

NGSS.HS-LS1-7