Cell membrane and transport test review

Which process would be molecules moving from a low concentration to a high concentration?

• diffusion

• active transport

• osmosis

• facilitated diffusion

Which statement is true regarding active transport?

• substances can move from areas of low concentration to areas of high concentration

• substances do not require additional energy to move in and out of the cells

• substances can only move into cells, not out of cells

• substances can only move across the cell membrane if they are water soluble

All of the following are types of passive transport except

• osmosis

• endocytosis

• facilitated diffusion

• diffusion

Water would move into a cell placed in a _____ solution

• hypertonic

• hypotonic

• isotonic

• all of the above

Which best describes the role of endocytosis in cell transport?

• Endocytosis moves substances into the cell

• Endocytosis moves substances out of the cell

• Endocytosis moves substances into or out of the cell, against the concentration gradient

• Endocytosis moves substances into or out of the cell, down the concentration gradient

How are phospholipids arranged in water

• It causes a bilayer to form with the tails pointing away from the center of the membrane.

• It causes a bilayer to form with the tails pointing toward the center of the membrane.

• It causes the heads to point towards the interior and the tails to point towards the exterior of the cell

• It causes the heads to point towards the exterior and the tails to point towards the interior of the cell

What process do ion channels use to move ions across the cell membrane?

• osmosis

• facilitated diffusion

• exocytosis

• pinocytosis

Facilitated diffusion allows certain kinds of compounds that are normally blocked by the cell membrane to cross the cell membrane. All of the following are examples of compounds that move by facilitated diffusion except

• glucose

• potassium (K+)

• sodium (Na-)

• oxygen

A drop of blue food coloring is put into a container of water that holds a plant. After a day, where would you expect to see the blue food coloring?

• in the stem only

• in the seeds

• in the stem and leaves

• nowhere in the plant

In general, in what direction does a diffusing substance move?

• down its concentration gradient

• up its concentration gradient

• to the inside of the cell

• it depends on the substance