교과서 질문
Place the following in the order in which they are found in a host cell: (1) capsid proteins;
(2) infective phage particles; (3) phage nucleic acid.
a. 1, 2, 3
b. 3, 2, 1
c. 2, 1,3
d. 3, 1, 2
e. 1, 3, 2
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18. Viruses, Viroids, & Prions
Bacteriophage: Lytic Phage Infections
Multiple Choice
Which of the following sequences correctly identifies the steps that occur in both the lytic and lysogenic cycles of bacteriophage infection?
A
Attachment, penetration, replication, assembly, release
B
Attachment, penetration, integration, replication, assembly, release
C
Penetration, integration, assembly, release
D
Attachment, integration, replication, assembly, release
검증된 단계별 안내1
Step 1: Understand the two main bacteriophage life cycles: the lytic cycle and the lysogenic cycle. Both begin with the phage attaching to the bacterial cell and injecting its genetic material.
Step 2: Identify the common initial steps in both cycles: Attachment (phage binds to the host cell) and Penetration (phage injects its DNA into the host).
Step 3: Recognize that after penetration, the lytic cycle proceeds with replication of phage DNA, assembly of new phage particles, and release of progeny by lysing the host cell.
Step 4: In contrast, the lysogenic cycle involves integration of the phage DNA into the host genome (forming a prophage) before replication, which is a step unique to lysogeny and not part of the lytic cycle.
Step 5: Therefore, the sequence common to both cycles includes Attachment, Penetration, Replication, Assembly, and Release, since integration is specific to the lysogenic cycle only.
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