Cells Review

Carrier molecules that facilitate transport across plasma membranes are made of _______.

• starches

• sugars

• proteins

• none of the above

_______ is the passage of a substance through a cell membrane from an area of higher concentration to lower concentration that does not require help from other molecules.

________ diffusion is the passage of a substance through a cell membrane from an area of higher to lower concentration that requires help from proteins.

• simple

• facilitated

• active

Moving substances into and out of the cell is an active part of maintaining equilibrium, or _____________, with continuous adjustments to keep the cell within normal limits.

Which statement is true concerning active transport?

• During active transport, molecules move from an area of high concentration to an area of low concentration

• Active transport is called "active" because it involves an active channel protein

• During active transport, molecules move from an area of low concentration to an area of high concentration

• All of the above

Which type(s) of transport require energy?

SELECT ALL THAT APPLY

• exocytosis

• osmosis

• endocytosis

• facilitated diffusion

Which of the following cell structures is responsible for protein synthesis?

• ribosome

• plasma membrane

• DNA

• lipid bilayer

Which of the following is outlined in the cell theory?

SELECT ALL THAT APPLY

• All organisms are made up of one or more cells

• All the life functions of an organism occur within cells

• All cells come from preexisting cells

• All cells have the same shape and function

Which of the following is a feature of the plasma membrane?

SELECT ALL THAT APPLY

• semi-permeable

• embedded proteins

• carbohydrates that act as markers/signals

• lipid bilayer

Which of the following are common to all cells?

SELECT ALL THAT APPLY

• cell membrane

• cytoplasm

• ribosomes

• DNA