Cell Transport Review

Proteins built into the cell membrane which assist with the movement of materials are called:

• receptor proteins

• transport proteins

• marker proteins

• channel proteins

Proteins built into the cell membrane which require energy to bind and to allow signal molecules in and out of the cell.

• receptor proteins

• transport proteins

• marker proteins

• channel proteins

Diffusion is the movement of a substance

• through a lipid bilayer

• only in water

• from an area of low concentration to an area of high concentration

• from an area of high concentration to an area of low concentration

The diffusion of water through a permeable membrane is called

• facilitated diffusion

• active transport

• osmosis

• endocytosis

Which of the following is NOT characteristic of active transport?

• It moves substances against a concentration gradient

• It requires energy from the cell

• It involves facilitated diffusion

• It relies on carrier proteins that often function as the sodium potassium pump

Which type of membrane protein transmits information into the cell by responding to signal molecules?

• carrier proteins

• transport proteins.

• receptor proteins

• marker proteins

Molecules that are too large to be moved through the cell membrane can be transported OUT OF the cell by

• osmosis

• exocytosis

• endocytosis

• diffusion

A solution where the concentration of a sugar solution is lower outside the cell than inside the cell, is a ______________ solution.

• hypotonic

• hypertonic

• isotonic

• exotonic

How is the plasma membrane of a cell organized?

• one layer of phospholipids, through which proteins freely move

• one layer of phospholipids, which are laid out end-to-end, with a hydrophobic tail touching a hydrophilic head

• two layers of phospholipids, each of which has its hydrophilic side turned inward

• two layers of phospholipids, with their polar hydrophilic heads facing away from each other

Which movement of substances through a cell membrane against a concentration gradient requires energy?

• osmosis

• diffusion

• active transport

• facilitated diffusion