7.7 Viruses Flashcards

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1
Q

are viruses alive?

A

not considered alive bc inability to replicate on their own, but can replicate themselves so classified same way as living things

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2
Q

virus

A

one or more nucleic acid molecules surrounded by protein coat (capsid)
- some viruses also surrounded by envelope created when virus leaves host cell and part of cell membrane wraps around virus

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3
Q

if viral genome composed of ss RNA?

A
  • genome replicated codes for reverse transcriptase
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4
Q

reverse transcriptase

A

uses RNA as template strand to synthesize complementary DNA

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5
Q

retrovirus

A

virus that uses reverse transcriptase for replication

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6
Q

functions of reverse transcriptase

A
  • copies viral RNA to make complementary molecule of ss RNA using cell’s supply of materials
  • directs synthesis of second DNA strand complecmentary to first and integrase incorporates reverse transcribed ds DNA into host cell genome
    transcription of viral DNA = viral RNA that serces as genome for new virus and can be translated to make viral proteins
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7
Q

virus as vector

A

ability of virus to enter cell and use cell’s replication enzymes gives method for inserting new genetic material into existed cells (insulin in safflower seeds)

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