Homework Answers
Option last is the correct answer.
Prions do not have nucleic acid (niether DNA nor RNA) rather prions are misfolded proteins (polymer of amino acids) which have ability to transmit their misfolded shape into normal variant of that protein. Prions may cause various neurodegenerative disorders in human beings and in other animals.
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which of these infectious agents do not have nucleic acid? virolds bacteria viruses prions
NUMEWORK 1. Compare and Contrast Viruses, Viroids, and Prions to Bacterial cells: Bacteria Viruses Virolds Prions...
NUMEWORK 1. Compare and Contrast Viruses, Viroids, and Prions to Bacterial cells: Bacteria Viruses Virolds Prions Width Length Nucleic Acid (type/s) Protein (present/absent) Cellular (yes/no) Cell membrane (present/absent) Functional ribosome (present/absent) Growth (yes/no) Self-replicating (yes/no) Responsiveness (present/absent) Metabolism (present/absent) 2. Compare and Contrast Bacteriophage and Animal Virus Replication: Bacteriophage Animal Virus Attachment Penetration Uncoating (if yes, how?) Site of synthesis Site of assembly Mechanism of release
Prions are infectious nucleic acids. living, acellular entities. misfolded proteins which can cause normal versions to...
Prions are infectious nucleic acids. living, acellular entities. misfolded proteins which can cause normal versions to also misfold None of the above All of the above
difinitions of each word Chapter Thirteen Viruses, Viroids and Prions General Characteristics of Viruses: Obligate intracellular...
difinitions of each word
Chapter Thirteen Viruses, Viroids and Prions General Characteristics of Viruses: Obligate intracellular parasites: Host range: Bacteriophages (phages): Phage therapy: Viral size: Viral structure (Virion): Nucleic acid: Capsid: Capsomeres: Envelope: Spikes: Enveloped viruses: Nonenveloped viruses: Morphology: Helical viruses: Polyhedral viruses: Complex viruses: Taxonomy of viruses:
Viruses- Bacteriology -Describe the characteristics of viruses. -Explain receptors for bacterial viruses (bacteriophage). -How do bacteria...
Viruses- Bacteriology -Describe the characteristics of viruses. -Explain receptors for bacterial viruses (bacteriophage). -How do bacteria prevent the invasion of foreign nucleic acids? -What is reverse transcriptase and which viruses use it? -What type of nucleic acids is in many important human disease-causing viruses? -List the possible consequences of viral infection of an animal cell? -Differentiate between animal and bacterial viruses. -Describe both lytic and lysogenic cycles. -Explain the potential advantages of lysogeny versus lysis for a temperate virus
Nucleic acid molecules have been isolated from seven types of viruses. The base composition of these...
Nucleic acid molecules have been isolated from seven types of viruses. The base composition of these molecules is shown in the table below but the data are incomplete regarding the composition of the nucleic acid, which is given in terms of the percentage of total base composition Virus Type Base 1 2 3 4 5 6 7 T 12 - 20 18 26 23 T 12 18 0 26 0 18 C 38 - 30 26 - 24 28 G...
QUESTION 73 The name of the scientist who first described viruses as infectious agents is: O...
QUESTION 73 The name of the scientist who first described viruses as infectious agents is: O A. Marc van Regenmortel B. Martinus Beijerinck OC. Leonard McCoy D. Antoni van Leeuwenhoek OE. Louis Pasteur QUESTION 74 Eukaryotic ribosomes cannot translate polycistronic mRNAS, SARS-coronavirus utilizes which of the following strategies to solve the polycistronic mRNA problem": O A alternative splicing B. discontinuous transcription creating a nested set of mRNAS OC alternative splicing OD.protease cleavage of a polyprotein E segmented genome
1. What viruses can cause meningitis or emcephalitis in humans? 2.Besides nucleic acid amplification, what other...
1. What viruses can cause meningitis or emcephalitis in humans? 2.Besides nucleic acid amplification, what other methods can be used to detect viruses that cause central nervous system infections, and how long do these test results take?
19. During virus growth, it is possible to obtain nucleic acid-free capsids. Under the electron microscope,...
19. During virus growth, it is possible to obtain nucleic acid-free capsids. Under the electron microscope, these capsids look similar to complete virions. Would you expect such empty virions to be infectious? Why or why not? 20. Many DNA viruses encode proteins that stimulate the host to enter the S phase of the cell cycle. Why is this important for DNA virus replication? and are DNA are viruses only depend on active in sphase 21. (a) What viruses encode for...
How do viruses acquire an envelope? Viruses manufacture cell membranes because it is encoded in their...
How do viruses acquire an envelope? Viruses manufacture cell membranes because it is encoded in their nucleic acid. Animal viruses don't make membranous envelopes; these are only produced in phage viruses. Only DNA viruses make envelopes because they have a gene for phospholipid production. When virus are released from host cell, they take the host cell membrane along with synthesized viral glycoproteins.
QUESTION 13 Genetic change in bacteria can be brought about by Transduction. Mutation. Transformation. Conjugation. All...
QUESTION 13 Genetic change in bacteria can be brought about by Transduction. Mutation. Transformation. Conjugation. All of the above. ooo QUESTION 14 All of the following pertain to glycolysis except occurs without oxygen. ends with formation of pyruvic acid. occurs during fermentation. degrades glucose to CO2 and H20. involves reduction of NAD. QUESTION 15 Which of the following statements about viruses is false? Viruses contain a protein coat. Viruses have genes. Viruses contain DNA or RNA but never both. Viruses...
NUMEWORK 1. Compare and Contrast Viruses, Viroids, and Prions to Bacterial cells: Bacteria Viruses Virolds Prions Width Length Nucleic Acid (type/s) Protein (present/absent) Cellular (yes/no) Cell membrane (present/absent) Functional ribosome (present/absent) Growth (yes/no) Self-replicating (yes/no) Responsiveness (present/absent) Metabolism (present/absent) 2. Compare and Contrast Bacteriophage and Animal Virus Replication: Bacteriophage Animal Virus Attachment Penetration Uncoating (if yes, how?) Site of synthesis Site of assembly Mechanism of release
difinitions of each word
Chapter Thirteen Viruses, Viroids and Prions General Characteristics of Viruses: Obligate intracellular parasites: Host range: Bacteriophages (phages): Phage therapy: Viral size: Viral structure (Virion): Nucleic acid: Capsid: Capsomeres: Envelope: Spikes: Enveloped viruses: Nonenveloped viruses: Morphology: Helical viruses: Polyhedral viruses: Complex viruses: Taxonomy of viruses:
Nucleic acid molecules have been isolated from seven types of viruses. The base composition of these molecules is shown in the table below but the data are incomplete regarding the composition of the nucleic acid, which is given in terms of the percentage of total base composition Virus Type Base 1 2 3 4 5 6 7 T 12 - 20 18 26 23 T 12 18 0 26 0 18 C 38 - 30 26 - 24 28 G...
QUESTION 73 The name of the scientist who first described viruses as infectious agents is: O A. Marc van Regenmortel B. Martinus Beijerinck OC. Leonard McCoy D. Antoni van Leeuwenhoek OE. Louis Pasteur QUESTION 74 Eukaryotic ribosomes cannot translate polycistronic mRNAS, SARS-coronavirus utilizes which of the following strategies to solve the polycistronic mRNA problem": O A alternative splicing B. discontinuous transcription creating a nested set of mRNAS OC alternative splicing OD.protease cleavage of a polyprotein E segmented genome
19. During virus growth, it is possible to obtain nucleic acid-free capsids. Under the electron microscope, these capsids look similar to complete virions. Would you expect such empty virions to be infectious? Why or why not? 20. Many DNA viruses encode proteins that stimulate the host to enter the S phase of the cell cycle. Why is this important for DNA virus replication? and are DNA are viruses only depend on active in sphase 21. (a) What viruses encode for...
How do viruses acquire an envelope? Viruses manufacture cell membranes because it is encoded in their nucleic acid. Animal viruses don't make membranous envelopes; these are only produced in phage viruses. Only DNA viruses make envelopes because they have a gene for phospholipid production. When virus are released from host cell, they take the host cell membrane along with synthesized viral glycoproteins.
QUESTION 13 Genetic change in bacteria can be brought about by Transduction. Mutation. Transformation. Conjugation. All of the above. ooo QUESTION 14 All of the following pertain to glycolysis except occurs without oxygen. ends with formation of pyruvic acid. occurs during fermentation. degrades glucose to CO2 and H20. involves reduction of NAD. QUESTION 15 Which of the following statements about viruses is false? Viruses contain a protein coat. Viruses have genes. Viruses contain DNA or RNA but never both. Viruses...
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