24 - Cell Transport Bonus Review

Active transport and facilitated diffusion are similar in that

• transport proteins are utilized

• use of ATP

• molecules move against (up) the concentration gradient

• all of the above

Huge molecules like proteins that can’t enter the cell through either the phospholipids or transport proteins move into the cell by

• exocytosis

• the sodium-potassium pump

• endocytosis

• facilitated diffusion

Which statement describes how the calcium ion, Ca2+, enters a cell.

• Carbohydrate groups on the membrane allow the ions to pass

• The fatty acid tails of the phospholipids allow ions to cross

• Protein channels in the plasma membrane allow ions to cross

• Phosphate groups of the phospholipid bilayer allow ions to cross

What is a major difference between active and passive transport?

• Active transport moves ions, while passive transport does not

• Active transport requires energy, while passive transport does not

• Active transport involves a concentration gradient, while passive transport does not

• Active transport uses membrane proteins and passive transport does not

A concentration gradient is created during ______ transport.

• active

• passive

During _____ transport, no ATP is used, molecules move with the gradient until a gradient does not exist (equilibrium)

• active

• passive

The phospholipid bilayer of the plasma membrane is LEAST permeable to (a)   ?

• Starch molecules, due to their size
• Oxygen molecules due to their size
• Cholesterol molecules due to polarity
• Carbon dioxide molecules due to their size

What is one way that facilitated diffusion differs from simple diffusion?

• Facilitated diffusion requires energy input

• Facilitated diffusion requires membrane proteins

• Facilitated diffusion requires a concentration gradient

• Facilitated diffusion requires small, nonpolar molecules

When particles move out of a cell through an ion channel, the cell

• gains energy

• loses energy

• first gains then loses energy

• does not use energy

Sodium ions move through a protein channel until there is a higher concentration in extracellular fluid than the cytoplasm. This is a type of ____ transport

• passive

• active