Plasma Membrane and Cellular Transport

Describes the arrangement of the cell membrane as bendable and made of many parts.

• the fluid mosaic model

• the major mobility model

• the crazy cell model

• the cell theroy model

Tags

NGSS.MS-LS1-2

What is the diffusion of water only across a cell or semi-permeable membrane?

• Osmosis

• Diffusion

• Active Transport

• Passive Transport

What type of cellular transport uses energy?

• Passive Transport

• Active Transport

In which case would a cell most likely shrink?

• when placed in a solution containing a high salt concentration

• when placed in a isotonic solution

• when placed in a solution containing a low pH

• when placed in a solution containing distilled water

Tags

NGSS.HS-LS1-3

Active transport requires energy because...

• The cell is moving something against a concentration gradient

• The cell is moving something with a concentration gradient

A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?

• Water moved into the lettuce cells by active transport.

• Water moved into the lettuce cells by osmosis.

• Salt moved into the lettuce cells by diffusion.

• Water moved out of the lettuce cells by osmosis.

Tags

NGSS.MS-LS2-1

Which of the following statements describes a characteristic feature of a carrier protein in a plasma membrane?

• It exhibits specificity for a particular type of molecule

• It requires the expenditure of cellular energy to function.

• It works against diffusion.

• It has not hydrophobic regions.

Which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly?

• sucrose.

• an amino acid.

• O₂.

• Na⁺.

Which of the following statements about diffusion is true?

• It is very rapid of long distances.

• It requires an expenditure of energy by the cell.

• It is an active process in which molecules move from a region of lower concentration to a region of higher concentration.

• It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

Which cell is in a hypertonic environment?

• A

• B

• C

• None of them are hypertonic

Tags

NGSS.MS-LS1-5