General microbiology

A. Reverse transcription B. Operon repression
C. Reverse translation D. Operon depression
E. Convariant replication
2. During reproduction of some RNA-containing viruses that cause tumors in animals, genetic information can be transmitted in the opposite direction from the RNA to the DNA via a specific enzyme. The enzyme of reverse transcription is called:
A. Reverse transcriptase B. DNA polymerase
C. Ligase D. Primase E. Topoisomerase
3. The examination of blood serum of a patient with immunodeficiency signs revealed antybodies to gP120 and gP41 proteins. The presence of what infection of this patient does it confirm?
A. НLTV-1-infection B. TORCH-infection
C. ЕСНО-infection D. НВV-infection E. HIV-infection
4. Blood analysis of a patient showed signs of HIVinfection (human immunodeficiency virus). Which cells does HIV-virus primarily affect?
A. Cells that contain receptor T4 (T-helpers)
B. Cells that contain receptor IgM (B-lymphocytes)
C. Specialized nervous cells (neurons)
D. Mast cells E. Proliferating cells
5. A patient consulted an immunologist about diarrhea, weight loss within several months, low-grade fever, enlarged lymph nodes. The doctor suspected HIV infection. What immunocompetent cells must be studied in the first place?
A. Helper T-lymphocytes B. Suppressor T-lymphocytes
C. B-lymphocytes D. Monocytes E. Plasma cells
6. HIV displays the highest tropism towards the following blood cells:
A. T-helpers B. T-suppressors C. T-killers
D. Thrombocytes E. Erythrocytes
7. Examination of a young man in the AIDS centre produced a positive result of immune-enzyme assay with HIV antigens. Patient’s complaints about state of his health were absent. What can the positive result of immune-enzyme assay be evidence of?
A. HIV infection B. Being ill with AIDS
C. Being infected with HBV D. Having had AIDS recently
E. HBV persistence
8. It was revealed that T-lymphocytes were affected by HIV. Virus enzyme - reverse transcriptase (RNA-dependent DNA polymerase) - catalyzes the synthesis of: