Description : Which of the following are oncogenic viruses? a. polio b. HIV c. HPV d. rabies
Last Answer : c. HPV
Description : A long thread-Like RNA virus is typical of the viruses. a. hepatitis C b. Ebola c. polio d. West Nile
Last Answer : b. Ebola
Description : Retroviruses are so-named because their reverse transcriptase _____. a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA. b. reverses the normal ... the action of drugs on viruses and allows them to continue multiplying in living cells.
Last Answer : a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA.
Description : Which of the following is correct regarding AIDS causative agent HIV? (a) HIV is enveloped virus containing one molecule of single-stranded RNA and one molecule of reverse transcriptase. (b) HIV ... ) HIV is unenveloped retrovirus. (d) HIV does not escape but attacks the acquired immune response
Last Answer : (d) HIV does not escape but attacks the acquired immune response.
Description : Which of the following viruses has a vaccine to prevent it? a. HPV b. HIV c. fifths disease d. herpes simplex I
Last Answer : a. HPV
Description : The only correct statement about oncoviruses is (A) All the oncoviruses are RNA viruses (B) Reverse transcriptase is present in all oncoviruses (C) Viral oncogenes are identical to human protooncogens (D) Both DNA and RNA viruses can be oncoviruses
Last Answer : Answer : D
Description : All of the following statements about RNA-dependent DNA polymerase are true except: (A) It synthesizes DNA using RNA as a template (B) It is also known as reverse transcriptase (C) It synthesizes DNA in 5’→3’ direction (D) It is present in all the viruses
Description : Which investigator developed a polio vaccine containing inactivated viruses? a. Enders b. Sabin c. Jenner d. Salk
Last Answer : b. Sabin
Description : These viruses multiply first in the tonsils and then the lymphoid tissues of the gastrointestinal tract. a. Rabies virus b. Rotavirus c. Polio virus d. Hepatitis A virus
Last Answer : c. Polio virus
Description : Which of the following shows coiled RNA strand and capsomeres? (a) Polio virus (b) Tobacco mosaic virus (c) Measles virus (d) Retrovirus
Last Answer : (b) Tobacco mosaic virus
Description : A DNA probe and PCR are being used to identify _____. a. HIV infection b. HPV in PAP smears c. coli in water quality tests d. A-C are correct
Last Answer : d. A-C are correct
Description : Which of the following is a reservoir of a disease? a. Dog - Toxoplasmosis b. Monkey - Ebola c. Bat - Rabies d. Goat - Leishmania
Last Answer : c. Bat - Rabies
Description : _________ fever was the first human disease associated with a virus. Walter Reed identified _________ as the carrier. a. Lassa, rats b. Dengue, mosquitoes c. Ebola, bats d. Yellow, mosquitoes
Last Answer : d. Yellow, mosquitoes
Description : Symptoms of headache, fever, and muscle pain Lasting 3 to 5 days, followed by a 2 to 24 hour abating of symptoms is characteristic of a. Yellow fever. b. Hepatitis C. c. Dengue fever. d. Ebola hemorrhagic fever.
Last Answer : a. Yellow fever.
Description : One of the first enzymes synthesized by many bacteriophage is __________ , an RNA dependent RNA polymerase A.RNA transcriptase B.RNA polymerase C.RNA ligase D.RNA replicase
Last Answer : D.RNA replicase
Description : Which of the following statements reflect what is known about the Ebola and Marburg viruses? a) The diagnosis should be considered in a patient who has a febrile, hemorrhagic illness after ... fever, rash, and encephalitis which progress rapidly to profound hemorrhage, organ destruction, and shock.
Last Answer : a) The diagnosis should be considered in a patient who has a febrile, hemorrhagic illness after traveling to Asia or Africa. The diagnosis should be considered in a patient who has a febrile, ... Asia or Africa, or who has handled animals or animal carcasses from those parts of the world.
Description : In which organism did the reverse transcriptase enzyme which performs DNA synthesis from RNA templates first appear?
Last Answer : Need answer
Description : Another name for reverse transcriptase is (A) DNA dependent DNA polymerase (B) DNA dependent RNA polymerase (C) RNA dependent DNA polymerase (D) RNA dependent RNA polymerase
Last Answer : Answer : C
Description : DNA directed RNA polymerase is (A) Replicase (B) Transcriptase (C) Reverse transcriptase (D) Polymerase III
Last Answer : Answer : B
Description : Reverse transcriptase catalyses (A) Synthesis of RNA (B) Breakdown of RNA (C) Synthesis of DNA (D) Breakdown of DNA
Description : Reverse transcriptase activity is present in the eukaryotic: (A) DNA polymerase α (B) DNA polymerase γ (C) Telomerase (D) DNA polymerase II
Description : Reverse transcriptase is capable of synthesising (A) RNA → DNA (B) DNA → RNA (C) RNA → RNA (D) DNA → DNA
Last Answer : Answer : A
Description : What are retroviruses? How do they reproduce and what is the role of the enzyme reverse transcriptase?
Last Answer : Retroviruses are viruses whose genetic material is RNA. HIV and the virus of SARS (severe acute respiratory syndrome) are examples of retrovirus. These viruses inoculate their RNA into the host cell ... virus and it is also inoculated into the host cell. Virus Review - Image Diversity: retrovirus
Description : HIV often changes its shape due to the presence of an enzyme called (1) Reverse Transcriptase (2) Enterokinase (3) Nucleotidase (4) Nucleoditase
Last Answer : (1) Reverse Transcriptase Explanation: Use of the reverse transcriptase enzyme is a unique characteristic of retroviruses such as HIV. After the virus releases its genetic material into a host cell, ... viral RNA into a complementary piece of DNA. This process is known as 'reverse transcription'.
Description : The enzyme reverse transcriptase helps in the
Last Answer : synthesis of DNA in the host cell.
Description : RNA interference involves (a) synthesis of cDNA and RNA using reverse transcriptase (b) silencing of specific mRNA due to complementary RNA (c) interference of RNA in synthesis of DNA (d) synthesis of mRNA from DNA
Last Answer : (b) silencing of specific mRNA due to complementary RNA
Description : At which stage of HIV infection does one usually show symptoms of AIDS? (a) Within 15 days of sexual contact with an infected person (b) When the infected retro virus enters host cells (c) ... large number of helper T - lymphocytes (d) When the viral DNA is produced by reverse transcriptase
Last Answer : (c) When HIV damages large number of helper T - lymphocytes
Description : The following are true about DNA synthesis: a. it requires DNA polymerase b. reverse transcriptase enzymes are involved c. moves in a 5'---> 3' direction d. the rate of error in DNA synthesis is 1 in 105 base pairs
Last Answer : it requires DNA polymerase
Description : Which one of the following makes use of RNA template to synthesise DNA? (a) DNA polymerase (b) RNA polymerase (c) Reverse transcriptase (d) DNA dependant RNA polymerase
Last Answer : c) Reverse transcriptase
Description : The initial regimen for antiretroviral therapy of previously untreated HIV patient consist of: A. Two nucleoside reverse transcriptase inhibitors (NRTIs) + one protease inhibitor (PI) B. Two NRTIs + one non-NRTI C. Three NRTIs D. Any of the above
Last Answer : D. Any of the above
Description : ndicate the anti-HIV regimen that is generally reserved for advanced cases of AIDS or for repeated treatment failures: A. Two nucleoside reverse transcriptase inhibitors (NRTIs) + one protease inhibitor (PI) B. Three NRTIs C. Two NRTIs + one non-NRTI D. One NRTI + one non-NRTI + one PI
Last Answer : D. One NRTI + one non-NRTI + one PI
Description : According to current guidelines, previously untreated symptomatic HIV patients should be treated with: A. Zidovudine alone B. Zidovudine + zalcitabine C. Zidovudine + indinavir D. Any two nucleoside reverse transcriptase inhibitors + one protease inhibito
Last Answer : D. Any two nucleoside reverse transcriptase inhibitors + one protease inhibitor
Description : Select the drug which directly inhibits HIV-reverse transcriptase without the need for intracellular activation by phosphorylation: A. Nelfinavir B. Nevirapine C. Stavudine D. Didanosine
Last Answer : B. Nevirapine
Description : The virus directed reverse transcriptase enzyme is inhibited by: A. Amantadine B. Zidovudine C. Vidarabine D. Acyclovir
Last Answer : B. Zidovudine
Last Answer : Reverse Transcriptase
Description : In 1842, Edwin Chadwick's report raised the possibility that sewage spreads disease along with a ______ outbreak which began the ________ movement. a. typhoid, aseptic b. cholera, sanitation c. polio, immunization d. none of the above are correct
Last Answer : b. cholera, sanitation
Description : Which of the following is a conjugate vaccine with tetanus or diphtheria toxoid? a. Salk polio b. Sabin polio c. influenza d. Hib
Last Answer : d. Hib
Description : Where in the body does polio attack? a. the gray matter of the spinal cord b. the white matter of the spinal cord c. the gray matter of the brain d. the white matter of the brain
Last Answer : a. the gray matter of the spinal cord
Description : The ______ can cause serious birth defects including mental impairment. a. Mononucleosis b. Cytomegalovirus c. Polio d. Hepatitis C
Last Answer : a. Mononucleosis
Description : Which one of the following is not a viral disease of the nervous system? a. West Nile fever b. Hantavirus c. Polio d. Rabies
Last Answer : c. Polio
Description : An example of a large complex virus is _____. a. polio b. smallpox c. cold sores d. SARS
Last Answer : b. smallpox
Description : DTaP is a toxoid vaccine that prevents ______. a. Diptheria b. Pneumonia c. Polio d. Diarrhea
Last Answer : a. Diptheria
Description : Which of the following viral infections is associated with the development of hydrophobia? A.Rabies B.Influenza C.Polio D.Hepatitis
Last Answer : A.Rabies
Description : Which one of the following is NOT considered an emerging infectious disease? a. Polio b. Hantavirus pulmonary disease c. Lyme disease d. AIDS
Last Answer : c. Lyme disease
Description : What is the advantage of the attenuated viruses in a vaccine?
Last Answer : Attenuated viruses can be taken orally because they will survive passage into the gastrointestinal tract and will be absorbed into the blood stream. The method of administration is therefore easier than by ... this reason they may be advantageous when an epidemic is taking place or is anticipated.
Description : Which one of the following pairs is incorrectly matched as to antibiotic and use? a. Penicillin-gram-positive bacteria b. Nystatin-fungi c. Tetracycline-viruses d. Griseofulvin-fungi
Last Answer : c. Tetracycline-viruses
Description : In the soil, antibiotics are produced by some a. Fungal species and viruses. b. Bacterial species and viruses. c. Viruses and helminthic species. d. Fungal and bacterial species.
Last Answer : d. Fungal and bacterial species.
Description : Why should you get a new influenza vaccine every year? a. it wears off fast b. the viruses change rapidly c. you need a booster to keep the immune level up d. none of the above are correct
Last Answer : b. the viruses change rapidly
Description : An attenuated vaccine is one that a. Can provide life-long immunity. b. Contains live microbes or viruses. c. Is closest to the natural pathogens. d. All the above (a-c) are correct.
Last Answer : d. All the above (a-c) are correct.
Description : Arboviruses are _____ viruses. a. arthropod-borne b. arthritis causing c. tree-borne d. A-C are correct
Last Answer : a. arthropod-borne