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BIOS 242 EXAM 2 REVIEW 2024/2025 WITH ACCURATE ANSWERS FOR GUARANTEED PASS
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BIOS 242 EXAM 2 REVIEW 2024/2025 WITH ACCURATE ANSWERS FOR GUARANTEED PASS
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BIOS 242 EXAM 2 REVIEW 2024/2025 WITH ACCURATE ANSWERS FOR GUARANTEED PASSWhich of the following describes a viral capsid?
The protein sheath that surrounds the nucleic acid core
The viral envelope is composed of which of the following (choose all that apply)?
Protein
Lipids
Glycoproteins
Viruses are nonliving particles with a genome made of DNA or ___________, surrounded by a shell
(capsid) made of ________
RNA; protein
Viruses can infect all types of organisms that have been investigated for their presence, but each type of
virus has a relatively narrow _________ ___________.
Host range
Genetic material is exchanged among two virions, undergoes recombination, and is packaged in capsids
synthesized by the parents.
Host cells' transcription and translation systems are used to replicate the genome and create capsid
proteins.
A _______is the protein sheath that surrounds the nucleic acid core of a virus.
Capsid
Which of the following is not found in the viral envelope?
,Nucleic acids
Virions lack the enzymes necessary for the synthesis of _______, as well as most of the enzymes
necessary for the replication of _______ acids.
Proteins; nucleic
Which of the following statements most accurately describes the host specificity of viruses?
Viruses infect all types of organisms, but individual viruses are very limited in the species and cell types
they can infect.
Viruses are unable to reproduce without which of the following?
A host cell
A virus' _______ ______ refers to the suitable cells they can infect.
Host range
Which of the following are the two types of structure typical of most viral capsids?
Icosahedral or helical
Which of the following describes a viral capsid?
The protein sheath that surrounds the nucleic acid core
,Tobacco mosaic viruses (TMV) have what type of capsid?
Helical capsid
Viruses are unable to reproduce outside a host cell for which of the following reasons?
They lack ribosomes and the enzymes necessary for protein synthesis and nucleic acid replication.
A helical capsid has a shape that resembles which of the following?
Rod or thread
Most viruses have a capsid that is ______ or _______ in terms of its basic structure and symmetry
Helical; Icosahedral
A virus that has a structure resembling a soccer ball, with 20 equilateral triangular facets is which of the
following?
Icosahedral virus
Which of the following is a virus that has a helical capsid?
Tobacco mosaic virus
Icosahedral capsid structure?
Bacteriophage T4
Poliovirus
Influenza virus
, The basic capsid shape of most animal viruses is a (n)
Icosahedral
Which of the following statements best describes viral genomes?
They may be circular or linear, single-stranded or double-stranded, and composed of DNA or RNA.
A viral capsid with an overall _______ structure has a rod like or threadlike appearance
Helical
Which of the following viruses uses the cellular machinery of a bacterium for its own replication?
Bacteriophage
During which of the following reproductive cycles does a bacteriophage integrate its own DNA into the
host cell's genome?
Lysogenic cycle
Which of the following may take place during bacteriophage reproduction after the phage genome is
injected into the host cell?
- The viral DNA is integrated into the genome of the host cell, allowing it to replicate when the host cell
divides.
- Lysogenic phage becomes lytic when cell stress causes depression of the prophage.
- New virus particles are synthesized by the cell and then released by lysis or budding.
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