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
Last Answer : Answer : D
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 : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oncogenes
Last Answer : Answer : C
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 : 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
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 is capable of synthesising (A) RNA → DNA (B) DNA → RNA (C) RNA → RNA (D) DNA → DNA
Last Answer : Answer : A
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 : Proto-oncogenes are: B A. DNA sequences in cells that are oncogenes themselves B. Cellular copies of genes that were first found in oncogenic retroviruses C. DNA viral sequences that are known to infect human cells D. Bacterial DNA counterparts
Last Answer : Cellular copies of genes that were first found in oncogenic retroviruses
Description : In which organism did the reverse transcriptase enzyme which performs DNA synthesis from RNA templates first appear?
Last Answer : Need answer
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 : 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 : Reverse transcriptase activity is present in the eukaryotic: (A) DNA polymerase α (B) DNA polymerase γ (C) Telomerase (D) DNA polymerase II
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 : RNA directed DNA polymerase is (A) Replicase (B) Transcriptase (C) Reversetranscriptase (D) Polymerase–III
Description : Proto-oncogens are present in (A) Oncoviruses (B) Cancer cells (C) Healthy human cells (D) Prokaryotes
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 statements about viruses is correct? (a) Viruses possess their own metabolic system. (b) All viruses contain both RNA and DNA. (c) Viruses are obligate parasites. (d) Nucleic acid of viruses is known as capsid.
Last Answer : (c) Viruses are obligate parasites.
Description : Template-directed DNA synthesis occurs in all the following except (A) The replication fork (B) Polymerase chain reaction (C) Growth of RNA tumor viruses (D) Expression of oneogenes
Description : Viral genomes consist of a. DNA only. b. RNA only. c. DNA or RNA. d. DNA and RNA
Last Answer : c. DNA or RNA.
Description : The correct statement concerning RNA and DNA polymerases is (A) RNA polymerase use nucleoside diphosphates (B) RNA polymerase require primers and add bases at 5' end of the growing polynucleotide ... and DNA polymerases can add nucleotides only at the 3' end of the growing polynucleotide chain
Description : 1. Bacteria protect themselves from viruses by fragmenting viral DNA with a. Ligase b. Endonuclease c. Exonuclease d. Gyrase
Last Answer : Ans: Endonuclease.
Description : Ames assay is a rapid method for detection of (A) Oncoviruses (B) Retroviuses (C) Chemical carcinogens (D) Typhoid
Description : Most viruses that infect plant possess (a) single-stranded DNA (b) single-stranded RNA (c) double-stranded DNA and RNA (d) double - stranded RNA only
Last Answer : Ans:(b)
Description : Viruses are no more “alive” than isolated chromosomes because (a) they require both RNA and DNA (b) they both need food molecules (c) they both require oxygen for respiration (d) both require the environment of a cell to replicate.
Last Answer : (d) both require the environment of a cell to replicate.
Description : Viruses have (a) DNA enclosed in a protein coat (b) prokaryotic nucleus (c) single chromosome (d) both DNA and RNA.
Last Answer : (a) DNA enclosed in a protein coat
Description : Technical virology questions about ERVs and RNA vs. DNA viral rates of mutation?
Last Answer : You’re going to make me dig out my old biochemistry texts for this one. Don’t have time now but I’ll do it when I get home from work.
Description : The antiviral action of amantadine is exerted through: A. Interaction with the viral M2 protein B. Interaction with a virus directed thymidine kinase C. Inhibition of a viral protease enzyme D. Inhibition of viral RNA mediated DNA synthesi
Last Answer : A. Interaction with the viral M2 protein
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 : 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 : 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 : Some viruses have RNA but no DNA. This would indicate that – (1) these viruses cannot replicate (2) these viruses have no heritable information (3) RNA transmits the hereditary information in these viruses (4) their nucleic acids can be crystallised
Last Answer : (2) these viruses have no heritable information Explanation: DNA is an informational molecule encoding the genetic instructions Along with RNA and proteins, it is one of the three major macromolecules that are ... guanine, adenine, thymine, and cytosine) recorded using the letters G, A, T, and C.
Description : Which of the following is true? (1) DNA is the genetic material in most of the organism (2) RNA is the genetic material in most viruses and bacteria (3) DNA is the genetic material in all the viruses (4) RNA is the genetic material in all the viruses
Last Answer : (1) DNA is the genetic material in most of the organism Explanation: Deoxyribonucleic acid (DNA) molecules are informational molecules encoding the genetic instructions used in the development and functioning of all ... letters. G, A, T, and C. DNA is well-suited for biological information storage.
Description : The chemical component that is invariably found in all viruses is (1) proteins (2) lipids (3) DNA (4) RNA
Last Answer : (1) proteins Explanation: All viruses contain the following two components: a nucleic acid genome and a protein capsid that covers the genome. Together this is called the nucleocapsid. The proteinous ... , many animal viruses contain a lipid envelope. The entire intact virus is called the virion.
Description : Virions are (a) DNA viruses (b) RNA viruses (c) Naked DNA viruses (d) Naked RNA viruses
Last Answer : (d) Naked RNA viruses
Description : Which is wrong about nucleic acids? (a) DNA is single stranded in some viruses. (b) RNA is double stranded occasionally. (c) Length of one helix is 45 Å in B-DNA. (d) One turn of Z-DNA has 12 bases
Last Answer : (c) Length of one helix is 45 Å in B-DNA
Description : .Viruses possess (a) ribosomes to synthesize protein (b) organelle for its vital mechanism (c) either DNA or RNA (d) none of these.
Last Answer : (c) either DNA or RNA
Description : .Viroids differ from viruses in having (a) DNA molecules without protein coat (b) RNA molecules with protein coat (c) RNA molecules without protein coat (d) DNA molecules with protein coat
Last Answer : (c) RNA molecules without protein coat
Description : 9 In some viruses DNA is synthesized by using RNA as a template. Such a DNA is called............ a. r-DNA b. C-DNA c. B- DNA d. A- DNA
Last Answer : Ans. b C-DNA
Description : Viroids differ from viruses in having; (1) DNA molecules without protein coat (2) RNA molecules with protein coat (3) RNA molecules without protein coat (4) DNA molecules with protein coat
Last Answer : (3) RNA molecules without protein coat
Description : The chemical component that is invariably found in all viruses is : (1) proteins (2) lipids (3) DNA (4) RNA
Last Answer : proteins
Description : Some viruses have RNA but no DNA. This would indicate that– (1) these viruses cannot replicate (2) these viruses have no heritable information (3) RNA transmits the hereditary information in these viruses (4) their nucleic acids can be crystallised
Last Answer : these viruses have no heritable information