Biology Ch.5--Passive and Active Transport

A structure that can move excess water out of a unicellular organism is a ____________.

• carrier protein

• cell membrane pump

• contractile vacuole

• ion channel

In the cell membrane, ion channels serve as _________.

• food molecules

• cell markers

• passageways

• information receivers

Sodium-potassium pumps ___________.

• move NA ions and K ions into cells

• Move NA ions and K ions out of cells

• Move NA ions into the cell and K ions out of the cell

• Move NA ions out of the cell and K ions into the cell

The movement of water through a cell membrane is called __________.

• diffusion

• active transport

• osmosis

• filtration

All forms of active transport are dependence on _________.

• ATP from the cell

• Ion channels

• Kinetic energy of the moleculesf

• carrier proteins

If the molecular concentration of a substance is the same throughout a space, the substance _________.

• has a large concentration gradient

• is in equilibrium

• will undergo diffusion

• will undergo osmosis

Which of the following is not a characteristic of active transport?

• It moves substances up a concentration gradient.

• It requires energy from the cell.

• It involves facilitated diffusion.

• It relies on carrier proteins that often function as pumps.

Facilitated diffusion is often used to transport _________.

• people

• molecules that are not soluble in lipids

• sodium and potassium through a cell membrane pump

• water

When particles move out of a cell through facilitated diffusion, the cell _________.

• gains energy

• uses energy

• first gains, then loses energy

• does not use energy

The excretion of materials to the outside of a cell by discharging them from vesicles is called _________.

• exocytosis

• endocytosis

• osmosis

• facilitated diffusion