RNA viruses require their own supply of certain enzymes because Select one: А. these enzymes penetrate host cell membranes. В. these enzymes cannot be made in host cells. С. host cells lack enzymes that can replicate the viral genome. D. these enzymes translate viral mRNA into proteins. E. host cells rapidly destroy the viruses.
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- The major difference between retrotransposons and retroviruses isa. retrotransposons encode reverse transcriptase.b. retroviruses move from one site in the genome toanother.c. retroviruses encode the env gene, which allows themto move from one cell to another.d. None of the above are correct.When using gene therapy to treat an hereditary disease, the idea is to: A. Introduce the correct gene into the patient's DNA B. Inject the patient with a specific protein to cure the disease. C. Blood transfusions from healthy individuals. D. ntroduce mRNA molecules with the correct genetic information to the patient. E. Introduce a virus to the patient that will specifically destroy mutated cells.There have been recent outbreaks of dog flu in the US. Why doesn't this virus infect humans? A) The virus can replicate in cells of all species but can only egress from dog cells. B) The genetic code of the virus is the same as that in dog cells but is different from other organisms. C) The virus can only attach to dog cells. D) The virus can enter cells of all species but can only replicate in dog cells.
- Using retroviral vectors for gene therapy might increase the patient's risk of developing cancer because they might: a. introduce proteins from the virusb. integrate recombinant DNA into the genome in ways that misregulate the expression of genes at or near the site of integrationc. not express the genes that were introduced into a patient's cellsd. not integrate their recombinant DNA into the patient's genomeWhat's the term to describe a mutant viral protein, apart from any genetic material, that can cause disease?O A. VirusO B. VirionO C. ViroidO D. PrionWhy can’t retrotransposons move from one cell to another like retroviruses?a. Because they do not encode the Env proteinb. Because they are nonautonomous elementsc. Because they require reverse transcriptased. a and b are both true.
- Bacteria are able to successfully transcribe and translate humangenes becausea. both bacteria and humans contain plasmid vectors.b. bacteria can replicate their DNA, but humans cannot.c. human and bacterial ribosomes are vastly different.d. the genetic code is nearly universal.Which statement is true of viral replication? A) virus attaches to a specific receptor site on the host-cell membrane. B) Once inside the cell, the viral capsid is degraded, and the viral nucleic acid is released. C) Virus uses the host cell’s machinery to replicate and new virus particles are released. D) All of the aboveProvide a brief description behind your choice? Virus-mediated transfer of cellular genetic material from one bacterial cell to another by means of virus particles is called: (A) transduction (B) transposition (C) transformation (D) transfection One strand of double-stranded DNA is mutated, changing all cytosines to uracils. After one round of replication of the mutated DNA strand, the melting temperature of the resulting DNA will: (A) be higher (B) be lower (C) remain the same (D) be double The Southern blotting technique is used for: (A) the detection of RNA fragments onmembranes by specific radioactiveantibodies (B) the detection of DNA fragments onmembranes by a radioactive DNAprobe (C) the detection of proteins on membranesusing a radioactive DNA probe (D) the detection of DNA fragments onmembranes by specific radioactiveantibodies Superoxide dismutase is an important enzyme for maintenance of red blood cells and is defective insome neurodegenerative diseases. What…
- Which of the following does NOT inititiate DNA synthesis ? (correct answer e) a. a single-stranded DNA virus. b. a (-) single stranded RNA virus c. a (+) single stranded RNA virus d. a double-stranded DNA virus (Poxviridae) e. Both (-) and (+) single-stranded RNA virusesSome scientists are trying to engineer bacteriophageto treat bacterial infections in humans when theinfections do not respond to chemical antibiotics.a. What possible advantages might phage therapyhave over antibiotic therapy?In his work with pneumonia-causing bacteria andmice, Griffith found that(A) the protein coat from pathogenic cells wasable to transform nonpathogenic cells.(B) heat-killed pathogenic cells causedpneumonia.(C) some substance from pathogenic cells was transferred tononpathogenic cells, making them pathogenic.(D) the polysaccharide coat of bacteria causedpneumonia.