Quiz_Viruses 1. The fact that best supports the concept that viruses are living is that viruses: duplicate themselves are made-up of common chemicals penetrate cell membrane cause disease Explanation:The ability of viruses to replicate themselves is a key characteristic that supports the notion that they are living entities. They can reproduce, but only within the living cells of a host organism. 2. AIDS (= Acquired Immune Deficiency Syndrome) is caused by: fungal spores bacterium pollen grains virus HLTV III or LAV or ARV Explanation:AIDS is caused by the Human Immunodeficiency Virus (HIV), which was initially referred to as HTLV-III, LAV, or ARV. HIV attacks the immune system, leading to a progressive failure of immune function. 3. Infective part of virus was discovered by: d’Herelle Hershey and Chase Ivanowski Stanley Explanation:Hershey and Chase conducted experiments using bacteriophages to demonstrate that DNA is the genetic material responsible for infecting bacteria. Their work provided crucial evidence that DNA carries genetic information. 4. Infective portion of a virus is nucleic acid, this was discovered by: Hershey and Chase d’Herelle Ivanowski Stanley Explanation:Hershey and Chase’s experiments with bacteriophages demonstrated that the nucleic acid (DNA) is the infective part of the virus. Their work confirmed that DNA carries genetic information. 5. The site where the protein coat of virus is synthesized is: mitochondria of the host plasma membrane of the host ribosome of the host RNA of the virus Explanation:The protein coat (capsid) of a virus is synthesized by the host cell’s ribosomes. The viral RNA or DNA directs the host’s ribosomes to produce viral proteins, which then assemble into the capsid. 6. Yellow vein Mosaic of Bhindi Virus (Hibiscus Virus-I) is transmitted through: butterflies white flies fungal mycelium moth Explanation:The Yellow Vein Mosaic Virus of Bhindi (Okra) is transmitted by whiteflies. These insects act as vectors, spreading the virus from infected to healthy plants. 7. A substance (a low molecular weight protein) produced by host cells in response to viral infection, that protects other cells against further viral infection is: antibody phytotoxin hormone interferon Explanation:Interferons are proteins produced by host cells in response to viral infections. They help protect other cells from infection by interfering with viral replication and activating immune responses. 8. In which of the following, RNA is the genetic material? Influenza virus TMV All of the above Poliomyelitis virus Explanation:TMV, Influenza virus, and Poliomyelitis virus all have RNA as their genetic material. These RNA viruses rely on RNA-dependent mechanisms for replication within host cells. 9. Prions are pathogens that are thought to consist solely of: DNA RNA _ _ 174 proteins Explanation:Prions are infectious agents composed solely of proteins. They cause neurodegenerative diseases by inducing abnormal folding of normal cellular proteins, particularly in the brain. 10. Number of capsomeres forming capsid of TMV is: 2100 2000 2130 2105 Explanation:The capsid of the Tobacco Mosaic Virus (TMV) is composed of 2130 capsomeres. These protein subunits form a helical structure that encases the viral RNA. Loading …
