Virus 101

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Which of the following best describes viruses?

Infectious agents composed of nucleic acid surrounded by a protein coat (correct)

Non-infectious agents composed of protein and lipids

Living organisms that can infect cells

Microscopic organisms composed of nucleic acid and protein

What is the primary component of viruses?

Protein

Nucleic acid (correct)

Lipids

Carbohydrates

Are viruses considered living organisms?

No, because they are composed of proteins

Yes, because they contain genetic material

Yes, because they can infect cells

No, because they are non-living agents (correct)

What are the possible configurations of viral nucleic acid?

Both ssDNA and dsDNA (B) Signup and view all the answers

Which of the following is NOT a possible shape for viral nucleic acid?

Triangular (B) Signup and view all the answers

Which type of nucleic acid can be found in viruses?

Both DNA and RNA (A) Signup and view all the answers

What is the possible configuration of viral nucleic acid?

All of the above (D) Signup and view all the answers

Do viruses have a single type of nucleic acid?

No, they can have both DNA and RNA (B) Signup and view all the answers

Which of the following is NOT a possible shape for viral capsids?

Spherical (A) Signup and view all the answers

What are the three forms of viral capsids?

Helical, polyhedral, complex (B) Signup and view all the answers

Which form of viral capsid is a combination of the helical and polyhedral forms?

Complex (C) Signup and view all the answers

Which of the following best describes host range?

The ability of a virus to infect multiple organisms (A) Signup and view all the answers

What determines the host range of a virus?

The capsid structure of the virus (C) Signup and view all the answers

Which of the following best describes tissue specificity?

The ability of a virus to infect a specific type of tissue in a host organism (B) Signup and view all the answers

Which of the following is NOT a possible host range for Rabies?

Insects (B) Signup and view all the answers

Which of the following is a common characteristic of HIV and Rabies?

They both have a narrow host range (C) Signup and view all the answers

Which type of RNA immediately supplies codes for protein synthesis?

+ssRNA (B) Signup and view all the answers

Which type of RNA serves as a template to make +ssRNA?

-ssRNA (B) Signup and view all the answers

What is the main difference between +ssRNA and -ssRNA?

+ssRNA immediately supplies codes for protein synthesis, while -ssRNA serves as a template to make +ssRNA. (D) Signup and view all the answers

Which of the following best describes a bacteriophage?

A type of virus that infects and replicates within a bacterial cell (A) Signup and view all the answers

What is the primary target of a bacteriophage?

Bacterial cells (D) Signup and view all the answers

What is the main difference between a bacteriophage and a regular virus?

Bacteriophages only infect bacteria, while regular viruses infect animals and plants (C) Signup and view all the answers

Which step of bacteriophage replication involves the release of viral DNA through the tail core?

Penetration (C) Signup and view all the answers

What happens during the Biosynthesis step of bacteriophage replication?

Multiple copies of the phage DNA are synthesized (D) Signup and view all the answers

What happens during the Lysis/Release step of bacteriophage replication?

The mature phage particles burst out from the cell (A) Signup and view all the answers

Which type of phage undergoes the lytic cycle, leading to the death of the cell through cell lysis?

Virulent phages (C) Signup and view all the answers

Which type of phage can become part of a host chromosome and are replicated with the cell genome until they are induced to make newly assembled viruses?

Temperate phages (D) Signup and view all the answers

Which phage example is an illustration of the lytic cycle?

T-even phage (D) Signup and view all the answers

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Questions and Answers

Which of the following best describes viruses?

What is the primary component of viruses?

Are viruses considered living organisms?

What are the possible configurations of viral nucleic acid?

Which of the following is NOT a possible shape for viral nucleic acid?

Which type of nucleic acid can be found in viruses?

What is the possible configuration of viral nucleic acid?

Do viruses have a single type of nucleic acid?

Which of the following is NOT a possible shape for viral capsids?

What are the three forms of viral capsids?

Which form of viral capsid is a combination of the helical and polyhedral forms?

Which of the following best describes host range?

What determines the host range of a virus?

Which of the following best describes tissue specificity?

Which of the following is NOT a possible host range for Rabies?

Which of the following is a common characteristic of HIV and Rabies?

Which type of RNA immediately supplies codes for protein synthesis?

Which type of RNA serves as a template to make +ssRNA?

What is the main difference between +ssRNA and -ssRNA?

Which of the following best describes a bacteriophage?

What is the primary target of a bacteriophage?

What is the main difference between a bacteriophage and a regular virus?

Which step of bacteriophage replication involves the release of viral DNA through the tail core?

What happens during the Biosynthesis step of bacteriophage replication?

What happens during the Lysis/Release step of bacteriophage replication?

Which type of phage undergoes the lytic cycle, leading to the death of the cell through cell lysis?

Which type of phage can become part of a host chromosome and are replicated with the cell genome until they are induced to make newly assembled viruses?

Which phage example is an illustration of the lytic cycle?

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