biology

Merivirus

Merivirus 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 Merivirus rather than just read about it. In short: Merivirus is a genus of viruses that is the sole genus in the family Corticoviridae. Meriviruses are bacteriophages; that is, their natural hosts are bacteria.

Key takeaways

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

Reference excerpt

Merivirus is a genus of viruses that is the sole genus in the family Corticoviridae. Meriviruses are bacteriophages; that is, their natural hosts are bacteria. The genus contains two species. From 1981 to 2024, the genus was named Corticovirus, sharing a name with its family. Prophages closely related to bacteriophage PM2 are abundant in the genomes of aquatic bacteria, suggesting that the ecological importance of meriviruses might be underestimated. Bacteriophage PM2 was first described in 1968 after isolation from seawater sampled from the coast of Chile.

Taxonomy The genus contains the following species:

Merivirus Cr39582 Merivirus PM2

Virology The virons consist of a round, icosahedral, non-enveloped capsid of a diameter of 60 nm and an internal lipid membrane located between outer and inner protein shell. The shells are composed of three layers whose surfaces reveals a pattern with distinctive features, including bush-like spikes protruding from the twelve vertices. The icosahedral capsid (T = 21) is 56 nanometers (nm) in diameter and is composed of 1200 P1 (spike) and 60 P2 (capsid) proteins. The pentameric receptor-binding spikes protrude from the 12 fivefold axes. The capsid encloses an internal lipid core containing the structural proteins P3 to P9.

Genome The genome is not segmented, constitutes 13% of the virus's weight and contains a single molecule of circular, supercoiled, double-stranded DNA of 10 kilobases in length. The genome has a g + c content of 43%. It encodes 21 proteins. The genome is organised into three operons. Replication of the genome is via a rolling-circle mechanism, initiated by the virus encoded endonuclease P12.

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by adsorption to the host cell surface followed by fusion of the viral membrane with the outer membrane of the host cell and subsequent genome delivery into the cell interior. DNA-templated transcription is the method of transcription. Bacteria of the genera Pseudoalteromonas, Marinomonas and Vibrio serve as the natural host. Bacteriophage PM2 is a lytic virus and at the end of the infection cycle disrupts the host cell using a unique lysis system consisting of phage-encoded proteins P17 and P18 as well as an unidentified host autolysin. However, identification of PM2-like proviruses in bacterial genomes indicates that other members of this family might be temperate viruses. Transmission routes are passive diffusion.

References

External links ICTV Online(10th) Report: Corticoviridae Viralzone: Corticovirus

Illustrations

Worked examples

Example 1 — a first encounter with Merivirus

Start with the simplest possible case. Write down what Merivirus 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 Merivirus 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 Merivirus 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 Merivirus

In research: Merivirus 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 Merivirus 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: Merivirus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteriophages, Corticoviridae, Virus genera, so understanding it makes those chapters shorter.
In everyday life: Look for Merivirus 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 Merivirus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Merivirus 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 Merivirus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Merivirus in simple terms?

Merivirus is a genus of viruses that is the sole genus in the family Corticoviridae. Meriviruses are bacteriophages; that is, their natural hosts are bacteria.

Why does Merivirus 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 Merivirus?

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 Merivirus.