Cell Transport

Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell membrane against the concentration gradient. How do these molecules get into the cell?

• passive transport by diffusion

• active transport using ATP 

• passive transport by osmosis

•  osmosis

The cell membrane of the red blood cell will allow water, oxygen, and carbon dioxide to pass through. Because other substances are blocked from entering, this membrane is called

• perforated

• semi-permeable

• non-conducive

• permeable

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

• cell membrane

• cell wall

•  mitochondrion

• nucleus

Which activity can occur without the use of energy?

• contraction of muscle tissue

• protein synthesis in a cell

• active transport of minerals

• movement of water across a membrane

The diffusion of water across a selectively permeable membrane is called 

• active transport

• facilitated diffusion

• osmosis

• phagocytosis

During diffusion molecules tend to move 

•    up the concentration gradient

•  from an area of lower concentration to an area of higher concentration

•  in a direction that doesn’t depend on concentration

•  down the concentration gradient

What are the two types of cell transport?

• Passive and Active

• Active and Facilitated

• Passive and Facilitated

• None of the above

In passive transport, substances move across the cell membrane ________ the concentration gradient

• AGAINST

• ALONG

• WITH

• BETWEEN

Which example describes diffusion?

• Water moving across a semi-permeable membrane

• Baking cookies and smelling them throughout the house

• Ions moving through an ion channel

• All of the above

What macromolecule is embedded into the lipid bilayer and helps to transport molecules?

• Carbohydrate

• Lipid

• Protein

• Nucleic Acid