Chapter 6 Characteristics of Viruses and Bacteria

One difference between bacteria and viruses is-

• bacteria respond to stimuli; viruses do not

• bacteria are living organisms; viruses are not.

• bacteria require a host cell to reproduce; viruses do not.

• viruses are composed of cells; bacteria are not

Bacteria are called ____________________ because their genetic material is not contained in nuclei.

• carbohydrates

• proteins

• eukaryotes

• prokaryotes

Viruses are considered nonliving because they-

• cannot multiply

• use energy to grow

• are smaller than bacteria

• do not show all of the characteristics of life

An antibiotic is a drug that selectively kills ______________.

• viruses

• bacteria

• fungi

• all of the above

Which statement is true about viruses?

• Viruses can eat and metabolize food.

• Viruses can reproduce only using a host cell.

• Viruses can reproduce on their own at any time.

• Viruses contain DNA, so they are alive.

Why are viruses like parasites?

• They make their own food

• They use their own energy to develop

• They multiply

• They harm the cells they enter

What type of organism can be found in extreme environments such as hot springs?

• viruses
• archaea 
• eukaryotes
• None of these

Bacteria reproduce by a process called

• sexual reproduction
• conjugation
• binary fission
• meiosis

One way in which bacteria are beneficial:

• they make food
• they cause disease
• they cause food poisoning
• they create sugar

Another way in which bacteria are beneficial:

• they are decomposers
• they are the powerhouse of cells
• they contain special DNA
• they are used to make Diet Coke