Unit 1 - Cell Transport

If a freshwater plant is placed in saltwater, what will happen to the plant?

• Salt will enter the plant's cells
• Water will enter the plant's cells
• Water will enter and exit the cell in equal amounts
• Water will exit the plant's cells

What differentiates facilited diffusion from other forms of passive transport?

•  In facilitated diffusion, a special protein channel helps substances cross the cell membrane
• Facilitated diffusion requires ATP.
• Facilitated diffusion is not a form of passive transport.
• In facilitated diffusion, water flows through protein channels until it reaches the same concentration inside and outside the cell.

How do substances move into the cell through endocytosis?

• Substances cross the cell membrane through protein channels.
• Substances are "engulfed" by a vesicle, which crosses the cell membrane
• Substances are "engulfed" by a cell's plasma membrane to form a channel into the cell.
• Substances are "engulfed" by a cell's plasma membrane and brought into the cell in a vesicle.

Which example(s) of cell transport does not require chemical energy

• Drops of blue food coloring are placed in water and spread throughout the water, turning it blue.
• A potato slice is placed in water and water molecules from inside the potato move into the surrounding water.
• Both Answers
•  Neither answers

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

•  water
• sodium
• potassium
• glucose

 Exocytosis is an example of what type of transport?

• facilitated diffusion
• active transport
•  passive transport
•  osmosis

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

•  pumping
• respiration
•  passive transport
• active transport

Examine the two solutions below.  They are separated by a semipermeable membrane that allows salt to pass but not allow starch to pass.   Which statement is true?

•  Salt will move from A to B by osmosis.
• Salt will move from B to A by diffusion.
• Salt will move from A to B by diffusion.
• Salt will move from B to A by osmosis.

 Proteins and polysaccharides that are too large to move into a cell through diffusion or active transport move in by

• exocytosis
• endocytosis
•  ion channels
• the sodium-poatssium pump

The sodium-potassium pump usually pumps

• only potassium ions and sugar molecules
• potassium ions out of the cell
• sodium ions into the cell
•  potassium ions into the cell