1. In a living organism, what is tissue
A. A group of similar cells that perform a common function
B. A group of cells that regulates the body’s responses to internal and external stimuli
C. The shell or skin of an organism
D. Functional unit, or building block, of all organisms; smallest unit that can carry on the activities of life

2. 2. The ___________ is a membrane-bound organelle that contains an organism’s genetic material and helps control and regulate cellular processes.
A. cell membrane
B. nucleus
C. mitochondrion
D. Ribosome

3. 3. What are the most basic building blocks of all organisms?
A. cells
B. tissue
C. blood
D. organs

4. 4. Once it has passed through the plasma membrane, this simple sugar is broken down to make a form of energy needed by the cell. What is the name of the simple energy?
A. protein
B. fat
C. water
D. glucose

5. 5. What type of organism is a one-celled organism that functions as a single unit?
A. precellular
B. multicellular
C. bicellular
D. unicellular

6. 6. In a living organism, what is an organ
A. a structure composed of a number of tissues that work together to perform a specific task
B. a group of similar cells that perform a common function
C. the shell or skin of an organism
D. functional unit, or building block, of all organisms; smallest unit that can carry on the activities of life

7. 7. A _________ is a rigid layer that surrounds a plant cell, providing structural support.
A. vacuole
B. cell membrane
C. nucleus
D. cell wall

8. 8. In order to grow and survive, cells need information from their DNA and nutrients from their environment. When a cell gets too big, however, what does it tend to do?
A. It divides into more cells.
B. It closes its pores so it cannot take in any more nutrients.
C. It explodes and is consumed by lysosomes.
D. It no longer receives information from the DNA.

9. 9. A _________ is a membrane-bound sac found in cells that contains digestive enzymes which break down complex molecules or structures.
A. chloroplast
B. lysosome
C. mitochondrion
D. vacuole

10. 10. In a cell, what is the function of the cell membrane.
A. It controls the entry and exit of substances.
B. It only maintains the cell shape.
C. It removes waste and stores ingested food.
D. It generates energy for the cell.

11. 11. In an animal cell, what is the function of the vacuole?
A. It stores substances such as food, water, and wastes.
B. It engulfs, pathogens that have invaded the cell.
C. It generates all of the energy for the cell.
D. It is the location where photosynthesis occurs.

12. 12. Which cell organelle is where proteins are made?
A. nucleus
B. vacuole
C. ribosomes
D. mitochondrion

13. 13. Which of the following is a substance that is found between the cell membrane and the nucleus, which primarily consists of water and holds organelles?
A. cell membrane
B. cytoplasm
C. mitochondria
D. chloroplast

14. 14. What do cells use to help transport other nutrients within the cell?
A. the energy made from carbohydrates
B. the fats in the plasma membrane
C. the watery environment of the cytoplasm
D. proteins in the nucleus

15. 15. Some unicellular organisms are similar to _________ because they have the ability to ___________.
A. birds, fly
B. reptiles, lay eggs
C. plants, produce sound
D. animals, move

16. 16. Which of the following organelles is most important in providing energy to a cell?
A. vacuole
B. nucleus
C. mitochondrion
D. cell membrane

17. 17. In which cell organelle does photosynthesis take place?
A. mitochondrion
B. ribosomes
C. chloroplast
D. cell wall

18. 18. Where, in a cell, does respiration occur?
A. mitochondria
B. chloroplasts
C. ribosomes
D. cell membrane

19. 19. Food-producing and energy-producing organelles in plants are
A. chloroplasts and mitochondria.
B. Golgi bodies and chloroplasts.
C. lysosomes and Golgi bodies.
D. mitochondria and lysosomes.

20. 20. What is the function of the cell membrane?
A. Moves materials in and out of the cell.
B. Stores materials such as water.
C. Carries nutrients throughout the cell.
D. Carries waste away from the cell.

21. 1. Suppose there is a town called Cellville
1. Suppose there is a town called Cellville. Which building in Cellville would have a purpose similar to the mitochondria of the cell?
A. the library
B. the water tower
C. the power plant
D. the police station

22. 2. The cell membrane is to the cell as a ___________________ is to a classroom.
A. desk
B. power outlet
C. book
D. door

23. 3. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Which of the following is an example of diffusion?
A. Open a gate to allow horses to pass through.
B. Food coloring spreading through water.
C. Carrying books to class.
D. Walking against the flow of traffic.

24. 4. Which statement best explains osmosis?
A. osmosis is the movement of water
B. osmosis is the diffusion of water
C. osmosis is the diffusion of water through a mixture
D. osmosis is the diffusion of water through a membrane

25. 5. Photosynthesis is the process in which light energy is converted into food. Which of the following is produced by photosynthesis?
A. light
B. heat
C. protein
D. sugar

26. Check your Answers: A B D 6.A 7.D 8.A 9.B 10.A 11.A 12.C 13.B 14.C