20. Viroids and prions: a. Compare viroids and prions in terms of structure and host.b. Describe how prions accumulate in nervous tissue and the appearance of the brain that has been infected with prions.

Recall the structure of prions and the diseases they cause.

Describe that Acarines are the potential disease vectors

7) The herpesviruses: a. Have three round of protein translation in its replication cycles, one before genome replication and two after genome replication b. Can have a persistent infection c. None

Briefly describe how herpes simplex viruses (HSVS) establish life-long chronic infections, sometimes recurring after several years of being dormant.

Give the properties of Coronavirus as an immunogen.

Name the disease that viroids can cause.

(a.) How do oncogenic viruses work? Describe known/proposed mechanisms linking viruses to HCC .

1. If a microorganism cannot be cultivated into pure culture, how will its pathogenicity be established in a host? (KOCH'S POSTULATE) a. What are the general factors that must interplay for disease to develop? b. Why are koch's postulate not useful in determining etiology of a viral disease?