CP Cell Membrane & Transport Test

How does the cell membrane help maintain homeostasis for the cell?

• By providing a circular structure for all cells.

• By making proteins to provide the cell with energy.

• By regulating the transport in and out of the cell.

• By storing food as future energy for the cell.

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TEK 4B

A student illustrated a model of particles being transported out of the cell. What best describes the transport process occurring in the model?

• Energy is used to move sodium ions from low concentration to high concentration.

• Sodium ions are moving from low concentration to high concentration without using energy.

• Energy is used to move sodium ions from high concentration to low concentration.

• Sodiums ions are moving from high concentration to low concentration without using energy.

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TEK 4B

A scientist is investigating cell transport. She observes molecules being transported into a cell through proteins present in the cell membrane. These proteins do not use energy to transport the molecules. Which of the following best explains the type of cell transport observed by the scientist?

• Active transport because membrane proteins were used

• Diffusion because the molecules were entering the cell

• Facilitated diffusion because the proteins were not using energy

• Osmosis because the molecules were moving against the concentration gradient

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TEK 4B

Which of the following describes osmosis?

• Oxygen transfers into red blood cells through small gaps in the cell membrane from oxygen-rich environment surrounding the cells.

• Large molecules are brought into the cell by wrapping the cell membrane around the molecules to forma vacuole.

• Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.

• Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

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TEK 4B

The diagram illustrates a cellular process. Which of the following best explains the process illustrated?

• Passage of water molecules through a semi-permeable membrane to equalize concentration.

• Transport of molecules across a membrane from a high to low concentration gradient by means of a carrier molecule.

• Movement of molecules against a concentration gradient expending energy.

• Separation of suspended particles from a fluid environment through a porous membrane.

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TEK 4B

The picture shows a cell model and the solutions associated with it. In this situation the cell model will -

• gain mass

• shrink

• increase in solute content

• start to vibrate

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TEK 4B

Which will most likely occur when a cell is immersed in a hypotonic solution?

• The cell will take in water.

• The cell will expel water.

• The cell will shrink.

• The cell size will not change.

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TEK 4B

The diagram below shows how a paramecium maintains homeostasis. A paramecium normally lives in a hypotonic environment in which water continually diffuses into the cell. To maintain homeostasis, the paramecium must pump out large amounts of water using its contractile vacuole. If the paramecium is then placed in a hypertonic environment, which of the following will occur?

• Water will diffuse into the paramecium.

• Water will diffuse out of the paramecium.

• Salt will be pumped out of the paramecium by the vacuole.

• Salt will be pumped into the paramecium by the vacuole.

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TEK 4B

Some students used vinegar to dissolve away the shells of three eggs and used these eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions. Which statement best describes the role of the cell membrane in this model?

• The cell membrane is an impermeable barrier that prevents water from entering the cell.

• The cell membrane allows solutes to enter the cell, which causes the cell to shrink.

• The cell membrane allows water to enter and leave the cell.

• The cell membrane removes solutes from the environment.

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TEK 4B

This diagram shows cellular activity across a cell membrane. Which two processes does this diagram most directly model?

• Energy conversions and synthesis of new molecules

• Synthesis of new molecules and homeostasis

• Transport of molecules and energy conversions

• Homeostasis and transport of molecules

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TEK 4B