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Chapter 21: Problem 52

Describe how viral replication introduces genetic variation in the viral population.

Short Answer

Expert verified
Replication errors introduce genetic mutations in viral genomes, leading to variations. These variations can result in changes in virulence, drug resistance, and immune evasion, driving viral evolution.

Step by step solution

01

- Understanding Viral Replication

Viruses replicate by invading host cells and utilizing the host's cellular machinery to produce new viral particles. This process often involves copying the viral genome.
02

- Genetic Variability During Replication

During the replication of the viral genome, errors, or mutations, can occur. These mutations can be a result of the viral polymerase lacking proofreading capabilities or the introduction of errors by the host's cellular machinery.
03

- Types of Mutations

The mutations that occur can be point mutations, insertions, deletions, or even segment reassortments in segmented viruses. These genetic alterations result in variability in the viral genome.
04

- Implications of Genetic Variability

The genetic variation created by mutations can lead to changes in viral properties such as increased virulence, resistance to antiviral drugs, or the ability to evade the host immune system.
05

- Evolution of Viral Populations

With each replication cycle, the genetic variability introduced may confer survival advantages to certain viral particles, leading to the evolution of the viral population through natural selection.

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Key Concepts

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

viral genome mutations
Viruses undergo mutations during their replication process. This means that errors or changes occur in their genetic material. These changes can happen for several reasons:
  • Errors by viral polymerase: The enzymes that copy a virus's genetic material sometimes make mistakes since many lack error-checking abilities.
  • Host鈥檚 cellular machinery: The host cell can introduce errors while helping the virus replicate.
Mutations are natural variations that can be small (like a single nucleotide change) or larger (like insertions or deletions). Over time, these random changes contribute to the genetic diversity within viral populations.
viral polymerase
Viral polymerase is crucial for the replication of the viral genome. This enzyme's primary role is to copy the viral RNA or DNA. However, many viral polymerases lack proofreading abilities. This means they cannot correct mistakes made during copying. As a consequence of these frequent errors, viral genomes rapidly gain mutations. The high error rate of viral polymerase results in a pool of diverse viral particles, each slightly different from the others. This diversity is essential for viral evolution and adaptation.
viral evolution
The continual mutation of viruses drives their evolution. Genetic variability allows viruses to adapt to changing environments. For example, mutations might help a virus:
  • Evade the host's immune system, making it harder for the host to fight off the infection.
  • Develop resistance to antiviral drugs, reducing the effectiveness of treatments.
  • Increase virulence, making the virus more capable of causing disease.
This process of adaptation is due to natural selection. Viruses with beneficial mutations are more likely to thrive and replicate, spreading their advantageous traits through the viral population. Thus, the genetic diversity within viruses ensures their continued evolution and survival in the face of host defenses and medical interventions.

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Most popular questions from this chapter

Prions are responsible for variant CJD (Creutzfeldt Jakob Disease). How has this disease been documented to spread from human to human? a. Surgery with instruments previously used in a patient with vCJD that were not adequately sterilized and contaminated pineal growth hormones taken from human pineal glands from infected cadavers. b. Through human consumption of infected meat and contaminated pituitary growth hormones taken from human pituitary glands from infected cadavers. c. Surgery with instruments previously used in a patient with vCJD that were not adequately sterilized and contaminated pituitary growth hormones taken from human pituitary glands from unwell individuals. d. Surgery with instruments previously used in a patient with vCJD that were not adequately sterilized and contaminated pituitary growth hormones taken from human pituitary glands from infected cadavers.

How did the development of a porcelain filter, called the Chamberland-Pasteur filter, help scientists discover viruses? a. After filtering a liquid plant extract, the scientists could see the virions using the light microscope. b. After filtering a liquid plant extract, the disease was still transferred to a healthy plant. c. After filtering a liquid plant extract, the virus cells multiplied. d. After filtering a liquid plant extract, scientists were able to trace historical footprints.

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.

On which industry can viroids have a severe impact? a. dairy b. poultry c. avocado d. livestock

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.
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