WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 15, Problem 9MC
Summary Introduction
Introduction:
The viruses are non cellular organisms that are characterized by having an inert crystalline structure outside the living cell .They are obligate intracellular
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An experimental drug therapy to treat patients with antibiotic-resistant bacteria involves introduction of a highly specific bacteriophage to the infected patient's bloodstream. Which of the following bacteriophage types would be the LEAST useful for this therapy?
a. a lytic bacteriophage
b. An enveloped virus
c. An RNA virus
d. a lysogenic bacteriophage
A positive-strand RNA virus:
a.must first be converted to a mRNA before viralproteins can be translated
b.is not recognized by host ribosomes.
c.can directly translate viral proteins.
d.will be degraded by host enzymes.
e.needs RNA dependent RNA polymerase to get converted into mRNA
A researcher, studying two different animal viruses (A and B) that infect the same cell type, digests away all the protein and transfers the nucleic acid directly into the host cell. Only virus B causes the infection. This suggests:
a. Virus A is likely to be a naked virus.
b. Virus A is likely to be an enveloped virus.
c. Virus A is likely to be a -ssRNA virus.
d. Virus A is likely to be a +ssRNA virus.
e. Virus A is likely to be a dsDNA virus.
And now explain why.
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WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- If the HIV did not have a reverse transcriptase enzyme, then which of the following would apply? Select one: a. The virus can make use of the reverse transcriptase enzyme from the host cell to convert its RNA into DNA b. Viral particles will be produced without reverse transcriptase enzyme since the original HIV is an RNA virus and needs to assemble RNA ant coat proteins together c. The virus will manufacture its proteins from its RNA using translation and ribosomes from host cell d. Provirus will not be formed and assembly of viral particles will never occur e. The virus will not be able to recognise the host cell and therefore entry into the cell is blockedarrow_forwardWhich of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA? A. Synthesis of double stranded RNA from a DNA template B. Transcription of mRNA from DNA C. Synthesis of DNA from an RNA template D. Synthesis of double stranded RNA from an RNA template E. Synthesis of DNA from a DNA templatearrow_forwardA virus is isolated, and individual virions appear spherical. What type of virus is this? A. Bacteriophage B. Helical C. Icosahedral D. Lysogenicarrow_forward
- Most viruses use their own virally encoded: a. DNA/RNA polymerase b. Endoplastmic reticulum c. Ribosomes d. Mitochondriaarrow_forwardThe drugs used against HIV in AIDS therapy are not effective against the flu because a. HIV is an RNA virus and influenza is a DNA virus. b. HIV is a DNA virus and influenza is an RNA virus. c. the two viruses have different-sized genomes. d. the proteins targeted by HIV drugs are not found in influenza.arrow_forwardWhich of the following does NOT inititiate DNA synthesis? 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 virusesarrow_forward
- Bacteriophages are viruses that infect bacteria. Depending on the bacteriophage, their genome can be made of either single or double stranded DNA or RNA.The composition of genetic material found in a bacteriophage is found to be 25% A, 33% T, 24% G, and 18% C. What can you conclude about the genetic material of this virus? Select one: a. It is single-stranded DNA. b. It is double-stranded DNA. c. It is single-stranded RNA. d. It is double-stranded RNA.arrow_forwardA prion is a disease-causing agent composed ofa. cells.b. nucleic acid with a protein coat.c. protein alone.d. nucleic acid alone.arrow_forwardwhat event occurs in bacteriophage multiplication that does not occur in animal virus replication?A,B,C,D, or E? a. adsorption to the host cells. b. injection of the viral nucleic acid into the host cell. c. host cell synthesis of viral enzymes and capsid proteins. d. assembly of nucleocapsids. e. replication of viral nucleic acid.arrow_forward
- A small nonessential circular DNA molecule in prokaryotes is called a: a. plasmid b. telomere c. bacteriophage d. prophagearrow_forwardViral genomes can bea. DNA or RNA.b. single-stranded or double-stranded.c. linear or circular.d. all of the above.arrow_forwardThere is a big debate if viruses are alive or not. Either way, look at the list below and pick out the accurate statements. A. Can only reproduce/replicate in a living cell. B. They have a protein coat surrounding and protecting the nucleic acid. C. Viruses have either DNA OR RNA - not both D. They sometimes have an envelope.arrow_forward
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