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Chapter 21: Problem 10

Which of the following statements about the viral replication cycle is accurate? a. The viral replication cycle does not affect the structure of the host cell. b. The viral replication cycle cannot affect genetic material of the host cell. c. The viral replication cycle has seven basic steps. d. The viral replication cycle can change cell functions or even destroy the host cell.

Short Answer

Expert verified
Statement D is accurate.

Step by step solution

01

- Understanding the Question

Read the question carefully to understand which statement about the viral replication cycle needs to be identified as accurate. Analyze each provided statement (a, b, c, d) for correctness.
02

- Analyze Statement A

Evaluate if the viral replication cycle affects the structure of the host cell. Research shows that many viruses can cause structural changes in the host cell, such as cytopathic effects.
03

- Analyze Statement B

Consider whether the viral replication cycle can affect the genetic material of the host cell. Viruses often integrate their genetic material into the host's genome, thus affecting it.
04

- Analyze Statement C

Examine if the viral replication cycle consists of seven basic steps. The typically known steps include attachment, penetration, uncoating, replication, assembly, and release. This makes it 6 steps, not 7.
05

- Analyze Statement D

Determine whether the viral replication cycle can change cell functions or destroy the host cell. Viral replication can indeed alter cell functions and even lead to host cell destruction.
06

- Conclusion

Based on the analysis, determine which statement is accurate. Statements A, B, and C are incorrect, while Statement D accurately describes the impact of the viral replication cycle.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Host Cell Structure
The host cell structure is crucial for understanding how viruses hijack cells to replicate. A host cell has various components, such as the cell membrane, cytoplasm, and nucleus. Viruses must navigate these structures during their replication cycle. Many viruses cause structural changes to the host cell, known as cytopathic effects. These changes can include the formation of inclusion bodies, cell lysis, or the fusion of infected cells into multi-nucleated giant cells. Understanding these changes helps in studying viral pathogenesis and developing treatments.
Genetic Material Integration
Certain viruses integrate their genetic material into the host cell's genome. This is a critical aspect of their replication cycle. Retroviruses, like HIV, reverse transcribe their RNA into DNA, which integrates into the host genome using the enzyme integrase. This integration allows the viral genome to be replicated along with the host鈥檚 DNA, leading to continuous production of new viruses. This process can disrupt normal gene function and contribute to diseases, such as cancer, by activating oncogenes or inactivating tumor suppressor genes.
Viral Replication Steps
The viral replication cycle consists of several key steps that a virus must complete to create new virions. The most commonly acknowledged steps are:
- **Attachment**: The virus binds to specific receptors on the host cell surface.
- **Penetration**: The viral particle or its genetic material enters the host cell.
- **Uncoating**: The viral capsid is removed, releasing the genetic material.
- **Replication**: The viral genome is replicated using the host's machinery.
- **Assembly**: New viral particles are assembled from the replicated genetic material and proteins.
- **Release**: New virions are released from the host cell, often killing it in the process. Understanding these steps is essential for developing antiviral therapies that can interrupt the cycle at various stages.
Cell Function Alteration
Viruses can significantly alter the functions of an infected host cell. These alterations often include:
- **Metabolic Changes**: Redirecting cellular pathways to favor viral replication.
- **Immune Evasion**: Suppressing the host immune response to avoid detection.
- **Apoptosis Inhibition**: Preventing cell death to prolong the replication phase.
- **Cytopathic Effects**: Structural changes that can result in cell death. The culmination of these impacts can destroy the host cell, contributing to the symptoms and severity of viral infections. Developing treatments that mitigate these changes is key to managing viral diseases.

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Most popular questions from this chapter

Compare the lytic and lysogenic cycles and explain which cycle has the potential to produce the most virions. a. The lytic cycle can theoretically produce more virions as the viral genome is incorporated into the host cell鈥檚 genome replicating along with the host cell. b. The lysogenic cycle can theoretically produce more virions as the reproductive cycle of viruses undergoing lysogeny is much faster than the reproductive cycle of viruses following lytic cycle. c. The lysogenic cycle can theoretically produce more virions as the viral genome is incorporated into the host cell鈥檚 genome replicating along with the host cell. d. The lytic cycle can theoretically produce more virions as the prophage following lysogenic cycle ultimately gets excised from the host cell鈥檚 genome and enter the lytic cycle

Which step in the replication cycle of viruses do you think is most critical for the virus to infect cells? Explain why. a. The attachment step is the most critical, as infection cannot begin if virus does not attach to the host cell. b. The replication step is the most critical as this step directs protein synthesis. c. The assembly step is the most critical because new virions are assembled to infect cells. d. The entry step is the most critical as nucleic acid of virus needs to enter the host cell naked, leaving the capsid outside.

For many viruses to penetrate the cell membrane and complete their replication inside the cell, the virus must attach to their host cells. Describe how a virus attaches to a host cell. a. A virus uses its cellular structure to attach to a host cell. b. A virus uses a plasma membrane to connect to a host cell. c. A virus uses matrix proteins to attach to a host cell. d. Viruses use viral receptors to attach to a host cell.

Why does the HIV virus use reverse transcriptase in the replication process? a. The HIV virus uses reverse transcriptase to replicate cells and build proteins. b. The HIV virus uses reverse transcriptase to erase mutated virions. c. The HIV virus uses reverse transcriptase because it is a retrovirus. d. The HIV virus uses reverse transcriptase because it has a DNA genome

What characteristics do viroids and viruses have in common? a. They both replicate within a host cell and contain nucleic acids. b. They both replicate within a host cell and do not contain nucleic acids. c. They both replicate within a host cell and contain proteins. d. They both replicate within a host cell and contain only RNA.
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