11. According to the fluid mosaic model of cell membranes,

A. the most common type of molecules in the membrane are proteins
B. basic membrane structure results from how the proteins interact with water
C. the membrane is a highly mobile mixture of phospholipids and proteins
D. the unique properties of cell types are determined by their phospholipids

12. The simplest way to differentiate a prokaryotic cell from a eukaryotic one is to

A. look for a plasma membrane
B. see if a nucleus is present
C. check for the presence of DNA
D. determine if the cell is an entire organism or not

13. Which of the following is the best criterion for deciding whether a cell is prokaryotic or eukaryotic?

A. The cell came from a single-celled or multicelled organism
B. The cell has a nucleus or not
C. The cell has cytosol or not
D. DNA is present in the cell or not

14. Lysosomes are specialized vesicles in __________ that contain digestive enzymes for the breakdown of food. A related originally known as a vacuole, which is found in __________, also contains enzymes but in addition, may act as a storage organelle for nutrients or water.

A. animals; plants and fungi
B. plants; animals and fungi
C. plants and fungi; animals
D. animals and plants; fungi

15. The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts

A. increase the surface area where key chemical processes can occur
B. help the cell against physical damage
C. make it possible to package large amounts of DNA within the cell
D. assist with cell movement