Life Science: Chapter 9

Bacteriophages are viruses that attack and destroy

• other viruses
• plants
• humans
• bacteria

A tiny, nonliving particle that invades and then multiplies inside a living cell is a 

• virus
• bacterium
• protist
• fungus

Most bacteria are surrounded by a rigid protective structure called the 

• cell membrane
• protein coat
• flagellum
• cell wall

Which of the following characteristics describes all protists?

• They are unicellular.
• Their cells have nuclei.
• They can be seen without a microscope.
• They are unable to move on their own.

A lichen is a symbiotic association between 

• protozoans and algae.
• algae and bacteria.
• fungi and plant roots.
• algae and fungi

Viruses act like parasites, which are

• both organisms benefit from living together
• organisms that live in or on a host and cause it harm
• protozoans and algae
• fuzzy-looking molds that have loosely tangled hyphae

When one cell divides to produce two identical cells:

• Contractile Vacuole
• Mutualism
• Binary Fission
• Binary Mutualism

In an Amoeba, a Contractile Vacuole is a structure that:

• Collects the extra water and then expels it from the cell
• Collects Giardia bacterium and expels it from the cell
• live in a host and cause it harm
• provides Mutualism support to both organisms

When a protozoan living inside a termite helps the termite digest wood, the relationship is called Mutualism because

• in binary fission, one cell divides to produce two identical cells.
• both organisms benefit from living together.
• the termite says, "What are those?!"
• protozoans collect excess water and expel it from the cell.

Fuzzy-looking molds have loosely tangled Hyphae, which are the

• organisms that live in or on a host and cause it harm
• Eukaryotes that have cell walls
• genetic material in their cells is not contained in a nucleus
• branching, threadlike tubes that make up the body of the multicellular fungi