Question

Question 57 (1 point) In order to result in a productive infection of susceptible cells, RNA tumor viruses must Question 57 options: A) Must transcribe their single-stranded genomic RNA to a double-stranded DNA that will exist as a plasmid in the cell cytoplasm. B) Integrate their RNA in the host chromosome C) Must transcribe their double-stranded genomic RNA to a double-stranded DNA that integrates in the cell chromosome. l D) Must allow their RNA to exit as a double-stranded RNA plasmi in the cytoplasm of the infected cell E) Must transcribe their single-stranded genomic RNA to a double-stranded DNA that integrates in the cell chromosome.

Question 58 (1 point) Artificial introduction of any foreign nucleic acid into a cell is known as: Question 58 options: A) Induction B) Transduction C) Zygotization D) Transfection E) Conjugation

Question 59 (1 point) The onc gene found in certain leukemia viruses is analogous to the gag gene found in the Rous sarcome virus. Question 59 options: True False

Question 60 (1 point) Microorganisms such as bacteria are measured in _________, whereas viruses are measured in __________ . Question 60 options: A) micrometers; millimeters B) inches; millimeters C) millimeters; inches D) millimeters ; micrometers E) micrometers ; nanometers

Answer 1

57. RNA tumor viruses are single stranded RNA viruses. They first make double stranded DNA by reverse transcription. After which they intergrate in to the host genome.

Option E is the right one.

58.

Transduction is viral introduction of DNA in to bacteria, transformation is the bacteria taking up DNA from surroundings.

Transfection is the artificial introduction of DNA in to the cells.

Option D is right.

59. onc gene of leukemia virus and gag gene of rous sarcoma virus are not analogous as they perfomr different functions.

False statement.

60. Bacteria are bigger than viruses. They are nearly 100 times bigger than viruses. So they are measured in microns and viruses in nanometers.

Option E is the right one.