What are true statements about viruses?

All true viruses contain nucleic acid—either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)—and protein. The nucleic acid encodes the genetic information unique for each virus. The infective, extracellular (outside the cell) form of a virus is called the virion.

Which characteristic is true of all viruses?

They are acellular, that is, they contain no cytoplasm or cellular organelles. They carry out no metabolism on their own and must replicate using the host cell’s metabolic machinery. In other words, viruses don’t grow and divide. Instead, new viral components are synthesized and assembled within the infected host cell.

Which of the following is true concerning Lysogenic viral replication cycle?

Which of the following is true concerning a lysogenic viral replication cycle? During lysogeny, the viral genome integrates into the host DNA, becoming a physical part of the chromosome. … This renders the virus unable to reproduce.

Which of the following is a characteristic by which viruses are classified?

Viruses are classified by phenotypic characteristics, such as morphology, nucleic acid type, mode of replication, host organisms, and the type of disease they cause.

Which of the following is not a characteristic of virus?

The Non – Living Characteristics of Viruses are: They are not cells, contain no cytoplasm or cellular organelles. They don’t grow and divide. New viruses are synthesized and assembled within the infected host cell.

Which is true of an acute viral infection?

An acute viral infection is characterized by rapid onset of disease, a relatively brief period of symptoms, and resolution within days. It is usually accompanied by early production of infectious virions and elimination of infection by the host immune system.

What is the status of viruses in classification?

Viruses are classified into four groups based on shape: filamentous, isometric (or icosahedral), enveloped, and head and tail. Many viruses attach to their host cells to facilitate penetration of the cell membrane, allowing their replication inside the cell.

Which of the following do viruses contain?

All viruses contain nucleic acid, either DNA or RNA (but not both), and a protein coat, which encases the nucleic acid. Some viruses are also enclosed by an envelope of fat and protein molecules.

Which of the following is a viral disease?

Viral Infections

Viruses cause familiar infectious diseases such as the common cold, flu and warts. They also cause severe illnesses such as HIV/AIDS, Ebola, and COVID-19. Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves.

Which of the following is a viral disease Mcq?

Viruses can cause a range of deadly diseases. Explore this space for more important MCQs for NEET at BYJU’S.

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Which of the following is a viral disease Class 9?

These are some of the most prevalent viral diseases – Common cold, Measles, Rabies, influenza, Herpes, Severe Acute Respiratory Syndrome, AIDS, Viral Hepatitis, etc. 2.

What is virus infection?

A viral infection is the proliferation of a harmful virus within the body. Symptoms of the viral illness are due to tissue damage and the associated immune response of the host. Types of viral infections. Respiratory viral infections: Respiratory viral infections affect the nose, lungs and airway.

What are examples of viral infection?

A few notable examples that have garnered the attention of the public health community and the population at large include: COVID 19, Ebola, SARS, Influenza, Zika, Yellow fever, Human immunodeficiency virus (HIV / AIDS), Human papillomavirus (HPV), Viral gastroenteritis, Varicella, and Viral hepatitis.

What are virus for Class 8?

A virus is a non-cellular, infectious entity composed of genetic material and protein that can only invade and reproduce within the living cells of bacteria, plants, and animals. A virus, for example, cannot replicate outside of the host cell. This is due to viruses lacking the necessary cellular machinery.

What diseases are caused by viruses for Class 8?

Common ailments like cold, influenza (flu) and most coughs are caused by viruses. Serious diseases like polio and chicken pox are also caused by viruses. Diseases like dysentery and malaria are caused by protozoa(protozoans) whereas typhoid and tuberculosis (TB) are bacterial diseases.

Is influenza A viral disease?

Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs. Influenza is commonly called the flu, but it’s not the same as stomach “flu” viruses that cause diarrhea and vomiting.