| A | B |
|---|
| Why are viruses like parasites? | They harm the cells they enter. |
| The only characteristic that viruses share with living organisms is | their ability to multiply. |
| What directly provides energy for a virus? | its host |
| A virus’s proteins are important because they | help the virus attach to its host. |
| A hidden virus | becomes part of the host cell’s genetic material. |
| The best treatment for most viral infections is | bed rest. |
| How does a vaccine work? | It activates the body’s natural defenses. |
| Which of the following stimulates a person’s body to produce chemicals that destroy viruses or bacteria? | vaccine |
| The process of breaking down food to release its energy is called | respiration. |
| Heterotrophic bacteria obtain food by | consuming autotrophs and other heterotrophs. |
| Endospores form during | harsh environmental conditions. |
| What process results in genetically different bacteria? | conjugation |
| Binary fission is the bacterial process of | asexual reproduction. |
| What important role do bacteria called decomposers play? | They return basic chemicals to the environment. |
| Which of the following is NOT a role of bacteria that live in human bodies? | fixing nitrogen |
| Like animals, animal-like protists are | heterotrophs. |
| Which structures allow sarcodines such as amoebas to move? | pseudopods |
| What characteristic do all algae share? | They are autotrophs. |
| Which of the following is an example of symbiotic mutualism? | a zooflagellate digesting food in a termite’s intestine |
| What animal-like characteristic do euglenoids have? | They can sometimes be heterotrophs. |
