第三章测试1.
A virus is a tiny infectious（）
A:particle B:nucleic acid C:living thing D:cell
答案:A
2.
Virus are known to infect
A:fungi B:bacteria C:all organisms D:plants 3.
The envelope of an animal virus is derived from the____of its host cell.
A:receptors B:cell wall C:cell membrane D:glycolyx 4.
Viruses cannot be cultivated in live mammals.
A:错 B:对 5.
The lysis of E. coli by T4 phage requires two specific proteins( ).
A:lysozyme B:holin C:transcriptase D:polymerases
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