IB Biology HL 2.3.3 Lytic Cycle of Lambda Phage

Similarities: [2 max]

a. in both lambda attaches to bacterial/host cell;

b. both insert DNA into the bacterial/host cell

OR

both infect the bacterial/host cell;

c. both use the bacterial/host cell (pathways) to replicate their DNA;

Differences [2 max]

d. in lytic (cycle), the viral DNA is replicated independently/remains separate from the bacterial/host DNA AND in lysogenic (cycle), the viral DNA integrates with the bacterial/host DNA;

e. in lytic viral/virion assembly occurs AND in lysogenic it is delayed/dormant;

f. in lytic, the bacterial/host cell is then destroyed/bursts/lysed AND in lysogenic it is delayed/not destroyed;

Marking guidance:

Do not accept answers referring to RNA, genome or genetic material instead of DNA. Use ECF for continued use of the above terms.

a. Do not accept that both cause cells to burst/die.

b. Do not accept insertion of virus into host cell.

c. Do not accept that the virus reproduces, it needs to be viral DNA replication.

Accept statements saying 'only' as implying that the other cycle is the opposite.

3
max