NURSING ANM AND GNM

NURSING EXAM QUESTIONS

PATHOLOGY AND GENETICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which virus injects their DNA into the host and destroys (lyse) the host cell immediately?
A
Lytic
B
Lysogenic
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -Bacteriophages have a lytic or lysogenic cycle. The lytic cycle leads to the death of the host, whereas the lysogenic cycle leads to integration of phage into the host genome. Bacteriophages inject DNA into the host cell, whereas animal viruses enter by endocytosis or membrane fusion.

Detailed explanation-2: -In the lytic cycle, the virus attaches to the host cell and injects its DNA. Using the host’s cellular metabolism, the viral DNA begins to replicate and form proteins. Then fully formed viruses assemble. These viruses break, or lyse, the cell and spread to other cells to continue the cycle.

Detailed explanation-3: -Viruses that target bacteria are known as bacteriophages. A bacteriophage has both lytic and lysogenic cycles. In the lytic cycle, the phage replicates and lyses the host cell.

Detailed explanation-4: -In the lytic cycle, a phage acts like a typical virus: it hijacks its host cell and uses the cell’s resources to make lots of new phages, causing the cell to lyse (burst) and die in the process.

There is 1 question to complete.