By virtue of their reproductive cycle, all viruses must possess a mechanism for all of the below except exiting the cell. gaining entry into the host cell. using host cell enzymes to translate viral proteins. incorporating their genetic material into the host genome.

All viruses possess a mechanism except exiting the cell

Explanation:

There are two main types of reproductive cycle in viruses, the lytic cycle and the lysogenic cycle.

In the lytic cycle, the bacteriophage attaches itself to the host cell through its tail fibers and gain contact with the host cell wall. The tip of the tail make a hole in the bacterial cell wall by means of enzyme lysozyme. Through this hole or point of entry, the viral genome enters the host cell and transcribe some mRNAs to form enzymes over the host ribosomes and degrades the host DNA and mRNAs. It takes over of the entire cellular machinery. Different components combine to form new phages particles or viruses The eclipse period is the period between entry of viral nucleoid into the host cell and the bursting of host cell to release new viruses.

Contrastingly, in lysogenic cycle, the phage DNA does not take over the control of cellular machinery of the host instead produces a repressor and undergoes reduction to temperate or non violent state.

The correct answer is -  carbohydrate.

Explanation:

Cellulose is a structural component of the plants and the most found material of the earth. Cellulose is a straight link chain of the polysaccharides made up of the glucose molecules joined together by the β 1, 4 glycosidic bonds.

The glycosidic bond gives these carbohydrates a rigid and flat structure that makes cell walls of the plant rigid and act as structural components. These stack one upon another as they are flat and form hydrogen bond that provides extra rigidity to these components.

Thus, the correct answer is option - carbohydrate.