Cellular Membrane and Transport

Only molecules with certain properties can pass through the cell membrane. The cell membrane is said to be:

• Impenetrable

• semi-solid

• semi-permeable

• rigid

Cell membranes are composed mostly of:

• proteins

• lipids

• carbohydrates

• nucleic acids

The movement of molecules from high to low concentration without the help of a protein is:

• facilitated diffusion

• diffusion

• active transport

• osmosis

The "head" of a phospholipid is:

• Hydrophobic (repels water)

• active

• Hydrophilic (attracted to water)

• passive

What property of phospholipids gives cells their round shape?

• Their ability to absorb water.

• Their rigid, immoveable structure.

• Their interactions with water.

• Their magnetic attraction.

Endocytosis is a process that transports large molecules or molecules in bulk:

• into the cell

• out of the cell

• from cell to cell

• into the nucleus

Osmosis is:

• The movement of water molecules from an area of low concentration to an area of high concentration across a selectively permeable membrane.

• The movement of water molecules from an area of high concentration to an area of low concentration across a selectively permeable membrane.

• The movement of solute molecules from an area of low concentration to an area of high concentration.

• The movement of solute molecules from an area of high concentration to an area of low concentration across a semi-permeable membrane.

Tags

NGSS.MS-LS1-1

What term means that the concentration of molecules on both sides are equal?

• gradient

• concentration

• isotonic/equilibrium

• imbalance

Which means of particle transport is shown in Figure 7-1 above?

• diffusion

• osmosis

• facilitated diffusion

• active transport

Both facilitated diffusion and simple diffusion are considered:

• endocytosis

• passive transport

• active transport

• exocytosis