26 Replication of viral genome Virus Part 2 of 3 Host cell Virus 0.16/0.62 points awarded Replication of viral genome Release of virus from the host cell Scored Assembly of new viruses References Cell surface receptor Assembly of new viruses Cell surface receptor Viral nucleic acid Viral nucleic acid HOS Production of viral proteins Production of val Release of Virus from the host cell < prey=”” 26=”” 27=”” of=”” 32=”” #=”” next=””> Type here to search o Bie L 9 Submited 11.09/20 Total 5.4-15.5 and 16 i Prion Virus Contains RNA only Infects plants Contains RNA only Mad cow disease Infects plants Contains DNA or RNA Mad cow disease Contains DNA or RNA Lacks a coat Disease-causing Disease-causing Involves proteins Lacks a coat 00000000000 < prev=”” 24=”” of=”” 32=”” next=””> search
The Correct Answer and Explanation is :
Correct Answers:
- Replication of viral genome: Viral nucleic acid
- Release of virus from the host cell: Scored
- Assembly of new viruses: Cell surface receptor
- Prion characteristics: Involves proteins, lacks a coat, disease-causing
- Virus characteristics: Contains DNA or RNA, disease-causing
Explanation (300 words):
Viruses are obligate intracellular parasites that rely on host cells for replication. The process of viral replication involves several key steps:
- Attachment and Entry: The virus attaches to a host cell via specific cell surface receptors. This specificity determines which cells a virus can infect.
- Replication of Viral Genome: Once inside, the virus releases its genetic material (DNA or RNA) into the host. DNA viruses typically replicate in the nucleus using the host’s DNA polymerase, while RNA viruses often replicate in the cytoplasm using their RNA-dependent RNA polymerase.
- Production of Viral Proteins: The viral genome is transcribed and translated using the host cell machinery to produce viral proteins, including enzymes, structural proteins, and capsids.
- Assembly of New Viruses: Viral genomes are packaged into newly synthesized capsids to form complete virions.
- Release of Viruses: Newly formed viruses exit the host cell through lysis or budding, which can damage or kill the host cell.
Prions are infectious agents composed solely of misfolded proteins. Unlike viruses, they lack nucleic acids (DNA or RNA) and a protective coat. Prions cause diseases like mad cow disease (Bovine Spongiform Encephalopathy) by inducing normal proteins in the host’s brain to misfold, leading to neurodegeneration.
Viruses, on the other hand, are characterized by their genetic material (either DNA or RNA) and their ability to cause a variety of diseases. They are encapsulated in a protein coat and sometimes a lipid envelope.
Understanding these mechanisms is vital for developing antiviral therapies and studying the impact of infectious agents like prions and viruses on living organisms.