Chapter 17 Mastering Bio

Identify all correct statements about how viroids differ from viruses.

Identify all correct statements about how viroids differ from viruses.

The H1N1 2009 outbreak is considered to have been which of the following?

Pandemic

What is the genetic material of retroviruses?

RNA

Suppose you were in charge of sending an unmanned space probe to a new planet in search of life. The probe would be able to collect and test samples and make observations, but the planet is too far away for the probe to be able to bring samples back to Earth. The probe is small and would only be able to run a few tests, so you want to pick a test for evidence of life that is broad enough to incorporate all forms of life as we know it. Which one of the following tests would be the best to use in this situation?

a test for the presence of cells that contain DNA.

Which of the following is NOT a characteristic of living things?

creating energy

What is the source of a viral envelope?

host cell membrane

What does the Borna virus target ?

mammals and birds

What is the function of reverse transcriptase

It catalyzes the formation of DNA from an RNA template.

Double-stranded viral DNA is incorporated into a host cell as a

Provirus

Why is combination drug therapy for HIV/AIDS less likely to lead to resistance than single drug therapy?

The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.

Which of the following statements about viruses is FALSE?

The widespread use of antibiotics has led to resistant strains of viruses(antibiotics has no affect on viruses)

Which of the following can be found in bacteria, but not viruses?

a cell membrane

Homeostasis is a living organism's

ability to maintain constant internal conditions even when environmental conditions change.

Viruses are

not alive because they are not made of cells and require a host cell for reproduction.

The genetic material of HIV consists of

single stranded RNA

A plant that has been raised in a sterile environment shows symptoms of a viral infection. How would you explain this?

symptoms from vertical transmission.

Viral DNA makes mRNA by the process of

transcription