Chapter 17 Mastering Bio – Flashcards
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What is the function of reverse transcriptase
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It catalyzes the formation of DNA from an RNA template.
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What is the source of a viral envelope?
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host cell membrane
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Double-stranded viral DNA is incorporated into a host cell as a
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Provirus
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Viral DNA makes mRNA by the process of
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transcription
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What is the genetic material of retroviruses?
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RNA
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What does the Borna virus target ?
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mammals and birds
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Which of the following is NOT a characteristic of living things?
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creating energy
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Homeostasis is a living organism's
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ability to maintain constant internal conditions even when environmental conditions change.
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Which of the following can be found in bacteria, but not viruses?
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a cell membrane
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Viruses are
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not alive because they are not made of cells and require a host cell for reproduction.
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Which of the following statements about viruses is FALSE?
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The widespread use of antibiotics has led to resistant strains of viruses(antibiotics has no affect on viruses)
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Why is combination drug therapy for HIV/AIDS less likely to lead to resistance than single drug therapy?
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The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.
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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?
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a test for the presence of cells that contain DNA.
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