Description : In which organism did the reverse transcriptase enzyme which performs DNA synthesis from RNA templates first appear?
Last Answer : Need answer
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 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 : 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 : 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 : Reverse transcriptase catalyses (A) Synthesis of RNA (B) Breakdown of RNA (C) Synthesis of DNA (D) Breakdown of DNA
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 : 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 : 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 : 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 : 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 : Which of the following viruses is a retrovirus with reverse transcriptase? a. HPV b. polio c. HIV d. Ebola
Last Answer : c. HIV
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 : 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 : Trickle charger of a storage battery helps to A. Maintain proper electrolyte level B. Increase its reverse capacity C. Prevent sulphation D. Keep it fresh and fully charged
Last Answer : D. Keep it fresh and fully charged
Description : RNA directed DNA polymerase is (A) Replicase (B) Transcriptase (C) Reversetranscriptase (D) Polymerase–III
Description : Manipulation of DNA in genetic engineering became possible due to the discovery of (a) restriction endonuclease (b) DNA ligase (c) transcriptase (d) primase
Last Answer : (a) restriction endonuclease
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 : Select the option which is not correct with respect to enzyme action. (a) Substrate binds with enzyme at its active site. (b) Addition of lot of succinate does not reverse the inhibition ... from that which binds the substrate. (d) Malonate is a competitive inhibitor of succinic dehydrogenase.
Last Answer : (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
Description : The high virus selectivity of acyclovir is due to: A. Its preferential uptake by virus infected cells B. Need of virus specific enzyme for its conversion to the active metabolite C. Its action on ... reverse transcriptase which does not occur in noninfected cells D. Both A' and B' are correct
Last Answer : D. Both ‘A’ and ‘B’ are correct
Description : Clinically, the angiotensin antagonists share the following features of angiotensin converting enzyme inhibitors except: A. Antihypertensive efficacy B. Potential to reverse left ventricular hypertrophy ... of effect on carbohydrate tolerance D. Potential to induce cough in susceptible individuals
Last Answer : D. Potential to induce cough in susceptible individuals
Description : Advantages of angiotensin converting enzyme inhibitors as antihypertensive include the following except: A. They tend to reverse left ventricular hypertrophy B. Their efficacy is not reduced by nonsteroidal ... . They do not worsen blood lipid profile D. They do not impair work performance
Last Answer : B. Their efficacy is not reduced by nonsteroidal antiinflammatory drugs
Description : An enzyme which helps in digestion is?
Last Answer : Protease
Description : Name the nondigestive enzyme which helps in activation of trypsinogen
Last Answer : Name the nondigestive enzyme which helps in activation of trypsinogen
Description : What is an enzyme found in the mouth and small intestine that helps in the breakdown of starch to sugar?
Last Answer : You may be referring to amylase.
Description : The enzyme enterokinase helps in conversion of (a) protein into polypeptides (b) trypsinogen into trypsin (c) caseinogen into casein (d) pepsinogen into pepsin.
Last Answer : (b) trypsinogen into trypsin