Why Do Some Animal Viruses Have an External Envelope, While

question 79

Multiple Choice

Why do some animal viruses have an external envelope, while bacteriophages never do?

• A) Some animal viruses bud out, taking part of the plasma membrane with them, whereas phages always lyse the host bacterial cell when they exit.
• B) When bacteriophages bud out, the plasma membrane is beneath the cell wall and therefore cannot be removed.
• C) When animal cells are lysed, part of the plasma membrane attaches to the virus; in bacterial cells, it is covered by the cell wall.
• D) When phages bud out of the host bacterial cell, they take with them part of the cell wall which forms the capsid, not an envelope.

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