Cell Transport Test Review AP Biology

What term is used to describe proteins that span the entire cell membrane?

• transmembrane proteins
• transport proteins
• carrier proteins
• all of these are types of proteins that cross the entire membrane

What does the term amphipathic mean?

• a molecule that contains both polar (hydrophilic) and nonpolar (hydrophobic) regions
• a molecule that is entirely polar (hydrophilic)
• a molecule that is entirely nonpolar (hydrophobic)
• a molecule that can completely dissolve in water 

Oxygen and carbon dioxide can cross the cell membrane easily on their own.  Which of the following best explains why this is possible?

• They are polar and are attracted to the nonpolar tails of the phospholipids that make up the cell membrane.
• They are both small and nonpolar(hydrophobic) and are attracted to the nonpolar(hydrophobic) tails that make up most of the cell membrane.
• They are large and nonpolar and move easily by diffusion across the membrane.
• They move through specialized channels that allow polar molecules to easily enter or exit a cell.

What are the structures called that water uses to cross the cell membrane?

• aquaporins
• peripheral proteins
• ion transporters
• water space ships

Why does water need to use transport proteins to enter or exit a cell?

• It is a nonpolar molecule and is repelled by the nonpolar (hydrophobic) phospholipid tails that make up most of the cell membrane.
• It is a polar molecule that is repelled by the nonpolar (hydrophobic) phospholipid tails that make up the majority of the cell membrane.
• It is a polar molecule that is repelled by the polar (hydrophilic) phospholipid heads that make up the majority of the cell membrane.
• Because it is extra special

Why do ions need to use transport proteins to enter or exit a cell?

• They are nonpolar molecules that are repelled by the nonpolar (hydrophobic) phospholipid tails that make up most of the cell membrane.
• They are polar molecules that are repelled by the nonpolar (hydrophobic) phospholipid tails that make up the majority of the cell membrane.
• They are polar molecules that are repelled by the polar (hydrophilic) phospholipid heads that make up the majority of the cell membrane.
• Scientists aren't really sure why they need them.

Which of the following correctly describes the process of osmosis?

• Movement of water from high to low concentrations across a semi-permeable membrane.
• Movement of large, polar molecules from low to high concentration across a semi-permeable membrane.
• Movement of ions through transport proteins across a semi-permeable membrane.
• Movement of any particle from high to low concentration.

Which of the following correctly describes the process of facilitated diffusion?

• Movement of water from high to low concentrations across a semi-permeable membrane.
• Movement of large, polar molecules from low to high concentration across a semi-permeable membrane.
• Movement of ions through transport proteins across a semi-permeable membrane from high to low concentration.
• Movement of any particle from high to low concentration.

Which of the following correctly describes the process of simple diffusion?

• Movement of water from high to low concentrations across a semi-permeable membrane.
• Movement of large, polar molecules from low to high concentration across a semi-permeable membrane.
• Movement of ions through transport proteins across a semi-permeable membrane from high to low concentration.
• Movement of any particle from high to low concentration.

Which of the following is NOT a type of passive transport?

• osmosis
• diffusion
• facilitated diffusion
• exocytosis