Transport Mechanisms

Which plasma membrane component can either be found on it surface or embedded in the membrane structure?

• protein

• cholesterol

• carbohydrate

• phospholipid

Water moves via osmosis ______________________.

• through cytoplasm

• from an area with low concentration of water to an area of high concentration

• from an area with high concentration of water to an area of low concentration

• from an area with a high concentration of other solutes to a lower one

Tags

NGSS.MS-LS2-1

The principal force driving movement in diffusion is the ___________.

• temperature

• particle size

• concentration gradient

• membrane surface area

How does the sodium-potassium pump make the interior of the cell negatively charged?

• by expelling anions

• by pulling in anions

• by expelling more cations than are taken in

• by taking in and expelling an equal number of cations

Tags

NGSS.HS-LS1-3

What happens to the membrane of a vesicle after exocytosis?

• It leaves the cell.

• It is disassembled by the cell.

• It fuses with and become part of the plasma membrane.

• It is used again in another exocytosis event.

Which transport mechanism can bring the whole cells into a cell?

• pinocytosis

• phagocytosis

• facilitated transport

• primary active transport

In what important way does receptor-mediated endocytosis differ from phagocytosis?

• It transports only small amounts of fluid.

• It does not involve the pinching off of membrane.

• It brings in only a specifically targeted substance.

• It brings substances into the cell, while phagocytosis removes substances.

It is an osmotic concentration of solution where solute is higher on the inside than the outside.

• hypertonic

• hypotonic

• isotonic

Plants maintain osmotic balance by pushing the cell membrane against the cell wall and keep the cell rigid. This mechanism is called ________________.

• extrusion

• isosmotic regulation

• turgor pressure

Tags

NGSS.HS-LS1-3

These carrier proteins move one molecule at a time.

• uniporters

• symporters

• antiporters