Answer:
The correct answer is D viruses that enter a lysogenic cycle do not immediately kill a host cell.
Explanation:
Lysogenic cycle is carried out by lambda phage which integrate its DNA with the genome of bacteria resulting in the formation of prophage.
The phage DNA replicate along with bacterial DNA and exist in this form for a period of time until the phage DNA recognizes any type of mutation such as exposure to ultraviolet ray which helps the lambda phage to enter the lytic cycle.
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Answer:
Penicillin binds and inhibits bacterial enzyme DD-transpeptidase.
Explanation:
Penicillin is made up of 4 rings of β-lactam and acts by binding to DD-transpeptidase of bacteria. The DD-transpeptidase facilitates the cross-linking of the peptidoglycan cell wall of bacteria. This leads to malformation of the protective cell wall of the bacteria and causes it to lyze and die.