Ch 5 quizizz

As a result of diffusion, the concentration of many types of substances

• always remains greater inside a membrane.

• eventually becomes balanced on both sides of a membrane.

• always remains greater on the outside of a membrane.

• becomes imbalanced on both sides of a membrane.

Diffusion takes place

• only through a lipid bilayer membrane.

• from an area of low concentration to an area of high concentration.

• only in liquids.

• from an area of high concentration to an area of low concentration.

The dispersal of ink in a beaker of water is an example of

• diffusion

• osmosis

• active transport

• endocytosis

Sugar molecules can enter cells through the process of

• exocytosis

• facilitated diffusion

• osmosis

• ion pumps

Channels utilizing facilitated diffusion

• work in two directions

• require an electrical signal to function.

• Both a and b

• None of the above

Which of the following is not characteristic of facilitated diffusion?

• It requires a carrier protein

• It moves substances against a concentration gradient.

• It requires no energy input.

• It involves a change in the shape of its carrier.

Which of the following is true of ions and their transport across cell membranes?

• The “gates” for ion channels are always open.

• Ions are very small and thus can cross cell membranes readily.

• Electrical or chemical signals may control the movement of ions across cell membranes.

• Because they are charged particles, the movement of ions across cell membranes requires energy input.

Which of the following does not expend energy?

• diffusion

• chemiosmosis

• active transport

• a sodium-potassium pump

Which of the following enters a cell by active transport?

• glucose

• water

• sodium ion

• potassium ion

The process by which water passes into or out of a cell is called

• solubility.

• osmosis.

• selective transport.

• endocytosis.