Cell Transport Quiz

Which model did scientist develop to describe the cell membrane?

• phospholipid model
• dynamic model
• fluid mosaic model
• transport model

Amino acids, sugars, and ions move across the cell membrane. Their movement from a region of high concentration to a region of low concentration is accomplished by special proteins in the membrane. Which of the following terms applies to this type of cell transport?

• osmosis
• simple diffusion
• active transport
• facilitated diffusion

What is a phospholipid composed of?

• a polar head and a nonpolar tail
• a nonpolar head and a polar tail
• a polar head and tail
• a nonpolar head and tail

Which phrase best describes the property of selective permeability?

• some molecules pass
• all ions pass
• large molecules pass
• all molecules pass

Water moves out of a cell when the solution surrounding the cell is

• hypertonic
• hypotonic
• isotonic
• concentrated

What is the term for the diffusion of WATER across a semipermeable membrane?

• osmosis
• equilibrium
• transport
• isotonic

In pure water, a red blood cell from an animal will swell and burst, but a leaf cell from a plant will not. Which rigid structure in the leaf cell is responsible for this difference?

• cell wall
• nucleus
• cell membrane
• mitochondrion

An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes

• water to move into the cell
• water to move out of the cell
• solute to move into the cell
• solutes to move out of the cell

Which phrase best describes passive transport?

• requires transport proteins
• requires no energy from the cell
• requires an isotonic solution
• requires facilitation by enzymes

Chamber A contains 40% helium and Chamber B contains 20% helium. Chambers are connected by a tube the molecules are free to cross. Which of the following will occur?

• helium will remain concentrated in chamber A
• some helium will move from chamber B to chamber A
• some helium will move from chamber A to chamber B
• all of the helium will move into chamber B