BACKGROUND CASE DATA;Upper-layer skin cells and the cells in the front surface of the eyes get a significant amount of oxygen directly from the air rather than from the blood. Human bodies have a huge demand for oxygen. As a result, the oxygen that is able to passively diffuse into the body directly from the air is not nearly enough to run the whole body. Fortunately, we have lungs that can actively pull in oxygen and transfer it to the blood, allowing the body to transport oxygen to the cells by using the blood like a fleet of delivery trucks.Mostof our cells rely on the blood delivery service. However, the cells in the outer layers or our skin and eyes are in direct contact with the atmosphere and can efficiently get their oxygen right from the air. Let's look at the eyes first.

For the eyes, it is especially important that there be no blood in the front parts. The parts at the front of the eye need to be transparent in order to let light shine into the eye, thus enabling vision. However, blood is an opaque red color. If blood flowed directly to the front parts of the eye, we would be blinded. As shown in the diagram at the right, the human eye consists of a round, tough white shell called the sclera which envelops a clear gel-like fluid called the vitreous humor. Light travels through the front parts of the eye, through the vitreous humor, and then strikes an array of light-detecting cells on the back of the eye which is called the retina. The front parts of the eye have the job of letting the light inside and focusing the light into images.

QUESTIONS

1.why is there a minimalinfection of the infecting dose when virus is small?

2.explain the concept of the null infection and relate to the tumorigenic

3.why isn't Size of the virusnot the criteria for the classification of virus-host interactions?highlight the basic criteria then

4. Which is not the part of Koch's postulate?

5.what inhibitive property of the Rec A protein leads to the accumulation of the cI protein.

6. Temperate phage can adopt only the lytic or replication cycle;critique/justify

7. The site of latency for CMV is?explain thoroughly

8.show and explain the relationship between the primary acute infectionandHSV-1 in the stomatitis disorder

9.what is the impact of the delay of theinfection of EBV

10.explain the phenomenon of LATs