CELL TRANSPORT ASSESSMENT

The major functions of the cell membrane do not include …

• A. separation of the fluid environments inside and outside of the cell

• B. maintaining homeostasis by regulating the passing of materials into and out of the cell

• C. recognition, signaling, and communication between different cells

• D. production of proteins used to construct the cell wall

The cell membrane contains channels and pumps that help move materials from one side of the membrane to the other. What are these channels and pumps made up of?

• carbohydrates

• lipids

• proteins

• nucleic acids

The diffusion of water across a selectively permeable membrane is called …

• endocytosis

• osmosis

• pinocytosis

• osmotic pressure

What letter on the phospholipid diagram indicates the hydrophobic region of the phospholipid?

• letter A

• letter B

Which letter on the diagram indicates the hydrophilic region of the phospholipid?

• letter A

• letter B

What is the main difference between passive transport and active transport?

• Passive transport occurs primarily in single-celled organisms, while active transport occurs primarily in multicellular organisms.

• Passive transport requires cell energy and active transport does not require cell energy.

• Passive transport never requires cell membrane proteins, while active transport requires membrane proteins.

• Passive transport does not require cell energy and active transport requires cell energy.

What will occur if a cell is placed in a hypotonic solution?

• Solutes will move into the cell from the surrounding solution.

• Water will move into the cell from the surrounding solution.

• Water will move out of the cell into the surrounding solution

• none of the above

The current theory of the structure of the cell membrane is best described by which model?

• sandwich model

• fluid-mosaic model

• selective model

• none of the above

Which letter on the diagram indicates a peripheral protein?

• letter A

• letter B

• letter C

• letter D

Collectively, what do letters B and C make up?

• the phospholipid bilayer

• an integral protein

• a glycoprotein

• a protein pump