biology

Yaravirus

Yaravirus is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Yaravirus rather than just read about it. In short: Yaravirus is an amoebic virus (a virus that reproduces in amoeba) that is a sole representative of its own class, Mriyaviricetes (from mriya (мрія), a Ukrainian word for "dream" or "inspiration" + -viricetes). It was discovered in the waters of Lake Pampulha in Minas Gerais, Brazil, in 2020.

Key takeaways

Yaravirus belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Yaravirus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Yaravirus from memory before moving on to harder problems.

Reference excerpt

Yaravirus is an amoebic virus (a virus that reproduces in amoeba) that is a sole representative of its own class, Mriyaviricetes (from mriya (мрія), a Ukrainian word for "dream" or "inspiration" + -viricetes). It was discovered in the waters of Lake Pampulha in Minas Gerais, Brazil, in 2020. The virus was found to be significantly smaller than any known amoebic virus, and is notable in that 90% of its genome appears to have no homology to previously sequenced amino acids in other organisms. The organism was named after the Brazilian mythological figure, Iara. One author described the virus as one that "simply makes no sense", and as "an extreme example", noting that "of Yaravirus' 74 genes, 68 are unlike any ever found in any virus". With respect to efforts by scientists to develop a megataxonomy of viruses, Yaravirus was described as "lonely and unclassifiable". Another analysis describes the virus as "either highly reduced and divergent NCLDVs or, more probably, the first non-NCLDV isolated from Acanthamoeba species", also noting "an ATPase most similar to the mimivirus homologue" and a major capsid protein phylogeny that is "not compatible with that of the ATPase phylogeny", suggesting that the virus originated through a horizontal gene transfer.

References

Further reading Brazilian scientists announced the discovery of a new amoebic "Yaravirus" in Lake Pampulha. (bioRxiv)(Science magazine) Boratto, Paulo; Oliveria, Graziele (28 January 2020). "A mysterious 80 nm amoeba virus with a near-complete "ORFan genome" challenges the classification of DNA viruses". Proceedings of the National Academy of Sciences. 117 (28): 16579–16586. doi:10.1073/pnas.2001637117. PMC 7368276. PMID 32601223., PDF here. Pennisi, Elizabeth (7 February 2020). "Scientists discover virus with no recognizable genes". sciencemag.org.

Illustrations

Worked examples

Example 1 — a first encounter with Yaravirus

Start with the simplest possible case. Write down what Yaravirus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Yaravirus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Yaravirus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Yaravirus

In research: Yaravirus appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Yaravirus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Yaravirus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bamfordvirae, Biota of Brazil, Taxa described in 2020, so understanding it makes those chapters shorter.
In everyday life: Look for Yaravirus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Yaravirus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Yaravirus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Yaravirus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Yaravirus in simple terms?

Why does Yaravirus matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Yaravirus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Yaravirus.