What usually happens to the host’s dna during the lytic cycle? a. it is destroyed.
b. it is integrated with the viral dna.
c. it becomes a provirus.
d. it is spliced with viral dna.

The right answer is A.It is destroyed.

In the lytic cycle, after penetration of the bacteriophage into a bacterial cell (the host cell), the virion (the whole bacteriophage) ceases to exist, only persists the genome in the bacterium. There is no more virus particle (about 12 min). Many events take place then: the synthesis of bacterial DNA is stopped by the phage, a phage DNAse will degrade (or destroy) the bacterial genome (phage DNAse for 2 to 3 min after penetration, resulting from early genes).

There is also production of mRNA and production of proteins constituting the nucleocapsid and, at the same time, the DNA multiplies. This DNA is formed in the form of "concatemers" (= rolling circle) that is to say several DNA sequences stuck together. Here accumulation of the different phage components: phage DNA, nucleocapsid => find the eclipse pahse.

The correct answer is -

A.It is destroyed.

Explanation:

The lytic cycle is considered as one of the two reproductive cycles that virus use for its reproduction (the other cycle is the lysogenic cycle).

This cycle results in the destruction of the host cell.

Bacteriophages (virus that infects bacteria)  use this cycle and referred as virulent phages.

There are basically five steps in this cycle -

Attachment of virus with the host cell membrane, penetration of the genome, which is followed by biosynthesis using host machinery, assembly of virus particles, and finally release, causing host cell destruction.

Thus, option A is the right answer.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg