31. Retrovirus oncogenes have no introns because: A. Cellular oncogens are highl

Question

31. Retrovirus oncogenes have no introns because: A. Cellular oncogens are highly conserved B. Viral oncogens are derived from cellular mRNA counterpart C. Viral oncogens can cause transformations D. Cellular oncogens contains introns and exons E. All of the above 32. When a tumor is said to metastasize, that means: A. the cells are proliferating in an uncontrolled manner B. blood vessels have entered the tumor C. cells of the tumor have invaded adjacent tissue D. an oncogene is expressed E. a tumor suppressor gene is being expressed

Explanation / Answer

31.B. Viral oncogene are derived from cellular mRNA counterparts.

Viral oncogenes is beleived to have originated from cellular protoncogenes. RNA copies of the protooncogenes lacking introns were incorporated into retrovirus genome which eventually became retroviral oncogene and these oncogene s multiplied by the subsequent infection and inseertion of these oncogenes into host cells of retroviruses.

32. C. Cells of the tumour have invaded adjacent tissues.

Ability of cancerous cells to enter into blood and lymph circulation and then migrate, colonize and invade normal tissues is called as metastasis.

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