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Characteristics of Life Quiz Answer Key 1. True or False: Maintaining a stable internal temperature is an example of homeostasis. true 2. True or False: All organisms have DNA in their cells. true 3. List three characteristics of life. Answers may vary. Characteristics include: 1. Need energy to carry out life processes. 2. Are composed of one or more cells. 3. Respond to their environment. 4. Grow and reproduce. 5. Maintain a stable internal environment. 4. Give an example of a single-celled organism. bacteria, plankton, or a Paramecium 5. What is the nucleus? Give a description of its role. The nucleus can be described as the "information center" of the cell, containing the instructions (DNA) for making all the proteins in a cell, as well as how much of each protein to make. 6. Which of the following are examples of maintaining homeostasis? a) A person sweats to retain heat. b) A bird fluffs its feathers to cool down. c) A lizard stretches out on a sunny rock to increase its internal temperature. d) All are examples of methods to maintain homeostasis. 7. Asexual reproduction a) combining genetic information from two parents. b) results in identical copies of the parent. c) occurs in all species. d) does not occur in single-celled bacteria. 8. Which statement is not true concerning cells? a) Every cell must get energy from food, be able to grow and divide, and respond to its environment. b) All cells have a nucleus. c) Cells are the smallest structural and functional unit of living organisms. d) All of the above statements are true concerning cells. 9. Energy comes from food. How do plants obtain energy? a) All plants must eat in order to obtain energy. b) Plants use energy from the sun to make their food. They then get energy from that food. c) Plants obtain their energy from other organisms. d) Plants obtain energy from materials such as rotting logs. 10. Which statement is true concerning all organisms? a) All organisms respond to their environment. b) All organisms are made of many cells. c) All organisms obtain energy fro other organisms. d) All of the above are true.