Lesson 555 of 1524
The Immune System and Disease
Their genomes contain either DNA or RNA, and they replicate using the replication proteins of a host cell.
Practice this chapterViruses are acellular entities that can usually only be seen with an electron microscope. Their genomes contain either DNA or RNA, and they replicate using the replication proteins of a host cell.
Viruses consist of a nucleic-acid core surrounded by a protein capsid with or without an outer lipid envelope A viral infection may be productive, resulting in new virions, or nonproductive, meaning the virus remains inside the cell without producing new virions
virion — an individual virus particle outside a host cell. T cell — a lymphocyte that matures in the thymus gland. capsid — the protein coating of the viral core. innate immunity — an immunity that occurs naturally because of genetic factors or physiology, and is not caused by infection or vaccination.
Worked example
What does “virion” mean in The Immune System and Disease?
- 1Use the wording this chapter gives for virion.
- 2The book says: an individual virus particle outside a host cell.
- 3Do not use the meaning of T cell. That term means a lymphocyte that matures in the thymus gland.
Result: an individual virus particle outside a host cell
Why. That is the meaning this chapter gives for virion.
Do not swap virion and T cell. virion means an individual virus particle outside a host cell. T cell means a lymphocyte that matures in the thymus gland.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.