1. Which cell types will most likely use flagella in the search for food? A. skin cells B. red blood cells C. white blood cells D. free-living protists

2. Which kind of cell has the greatest number of mitochondria? A. brain cell B. lung cell C. muscle cell D. skin cell

3. Which type of cell communication is exhibited when a person with diabetes has a raised blood sugar level and injects insulin? A. extracellular-matrix-cell contact B. secreted short-range signals C. long-range signals D. electrical signals

4. Each mitochondria has an inner membrane called cristae. How are these cristae beneficial to the mitochondria? A. The cristae provide the mitochondria more surface area for DNA replication. B. The cristae provide the mitochondria more membranes for photosynthesis to occur. C. The cristae provide the mitochondria more surface area with which to make energy. D. The cristae provide the mitochondria more surface area to allow for more cellular transport.

5. If a person is in danger, a nerve cell receives stimuli from the eyes and sends a message to the person to move. How does the nervous system tell the muscles to move? A. Integration of synapses occurs. B. Repolarization occurs in the nerve cell. C. Sodium and potassium react in muscle cells. D. Motor neurons send impulses to muscle cells.

6. Which organelle controls the actions of other organelles? A. nucleus B. Cytoplasm C. Mitochondria D. plasma membrane

7. What is the function of the plasma membrane in plant and animal cells? A. to act as an exoskeleton for the cells B. to provide a food source for the cells as they divide C. to allow gases to leave the cells and allow other gases to enter the cells D. to define the boundary of the cells and regulate chemical passage between the cells

8. Which structure differentiates a plant cell from a human cheek cell? A. nucleus B. cell wall C. Mitochondria D. cell membrane

9. What aspect of a cell has the greatest impact on its function? A. shape B. Nutrition C. organelles present D. ability to reproduce

10. Cells communicate with each other within body systems and between body systems. Which two systems control the internal functions of the body? A. respiratory and nervous systems B. circulatory and reproductive systems C. nervous and circulatory systems D. endocrine and nervous systems