本题目来源于试卷: Unity and Diversity A.5 Viruses，类别为 IB生物学
[单选题]
Some bacteriophages infect host bacteria usincvuf d* ad8+yra9u0 m-g the lytic cycle or the ly,dav1 2om b,-hxlbo (bsogenic cycle., dbbo vb,l1-o mh2a(x Which process is characteristic of the lysogenic cycle but not the lytic cycle?
A. Phage DNA is injected into the host cell.
B. The phage inserts DNA into host DNA, forming a prophage.
C. Host bacterium is killed by cell lysis.
D. Phage proteins bind to receptors on the host bacterium cell.
参考答案: B
本题详细解析:
Choice B is correct because phage DNA is i6 c7nnqvvlb, 42 qkaj,nserted into the host cell DNA in the lysogenic cycle, but not the lytic cycle. During the lysogenic cycle and lytic cycle, phage proteins bind to specific receptors on the surface of the host bacterium (Choice D). Phage DNA is then insea b,7q,64 vjn2kqnclvrted into the host bacterium (Choice A) in both the lysogenic cycle and lytic cycle. Host bacterial cells are killed by lysis in the lytic cycle (Choice C).
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