A Involved in cell reproduction
B Site of protein synthesis
C Outer boundary; controls what moves into and out of the cell
D Contains DNA & nucleolus; control center
E
F
Site of photosynthesis
Rigid outer layer; provides structural support in plant cells
G Breaks down glucose and produces energy; powerhouse
H Packages and delivers proteins and lipids; UPS
I DNA strands containing the cells’ instructions; decondensed chromosomes
J Cell digestion using enzymes; garbage disposal
K Production and storage of ribosomes; dark spot in the nucleus
L Storage of water and waste; large in plants
M Transporter of proteins and lipids; highway
N Jelly-like substance; contains the organelles
O Solution containing mostly water; causes a cell to swell
P Movement of water from high concentration to low until equilibrium
Q Solution with equal solute to solution ratio; cell placed in this solution stay the same
R Any living thing as a whole; may be unicellular or multicellular

19. Under a microscope, a series of cells are observed that lack membrane-bound internal organelles.
Which of these is the most likely cell type?
A Plant cell
B Animal cell
C Eukaryotic cell
D Prokaryotic cell
20. Which of these supports the cell theory as it is stated today?
F New cells are produced by division of existing cells.
G All organisms are composed of more than one cell.
H Cells must contain a nucleus.
J Not all cells are alive
21. A student observes that a type of eubacteria contains chlorophyll. Which of these does this type of bacteria have in common with plants?
A It is photosynthetic.
B It contains vascular tissues.
C It contains mitochondria.
D It is heterotrophic.
22. What do viruses need to reproduce?
A Other viruses
B Host organisms
C A nutrient medium
D An enzyme solution
23. Which discovery was essential to the concept that all life forms have cells as basic units?
F Water is the chemical solvent involved in many cell processes.
G New cells are produced from the division of existing cells.
H Some substances in organisms exist outside of cells.
J Cells are dependent on energy and nutrients from external sources.
24. The oxygen content in the atmosphere of the early
Earth is thought to have increased significantly once which of these developed?
A Amino acids
B Archaebacteria
C Photosynthetic bacteria
D Mitochondria
25. The main reason that eating salty foods makes a person thirsty is that additional fluid is needed to —
F increase the salinity of the blood
G dissolve salt crystals in the stomach
H maintain the fluid balance in the cells
J prevent damage to the lining of the throat
26. Which is an important function of the cell structure in this model?
A Controlling passage of materials
B Packaging cell products for export
C Transferring hereditary material to offspring
D Preventing a cell from bursting due to osmosis
27. Which is the name of structure 4?
A Nucleus
B Ribosome
C Vacuole
D Cell wall
28. Many marine invertebrates have body surfaces that are permeable to water but not to salt. Osmosis can change the pressure of their body fluids. Fortunately, the ocean is very stable in its salt content. What would happen if a jellyfish were placed in a very low-salt environment such as an estuary?
A It would gain water from the environment.
B It would gain nutrients from the water in the environment.
C It would lose proteins into the water.
D It would lose salt into the water.