biology

Bidensovirus

Bidensovirus 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 Bidensovirus rather than just read about it. In short: Bidensovirus is a genus of single stranded DNA viruses that infect invertebrates. The species in this genus was originally classified in the family Parvoviridae (subfamily Densovirinae) but was moved to a new genus because of significant differences in the genomes.

Key takeaways

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

Reference excerpt

Bidensovirus is a genus of single stranded DNA viruses that infect invertebrates. The species in this genus was originally classified in the family Parvoviridae (subfamily Densovirinae) but was moved to a new genus because of significant differences in the genomes.

Taxonomy There is one species in this genus: Bidensovirus bombymori, commonly called Bombyx mori bidensovirus.

Host As the name suggests this virus infects Bombyx mori, the silkworm.

Virology The virions are icosahedral, non enveloped and ~25 nanometers in diameter. They contain two structural proteins.

The genome is bipartite, unique among ssDNA viruses, with two linear segments of ~6 and 6.5 kilobases (kb). These segments and the complementary strands are that are packaged separately giving rise to 4 different types of full particles. Both segments have an ambisense organization, coding for a structural protein in one sense and the non-structural proteins on the complementary strand.

DNA1 (also known as VD1) — the larger segment of 6.5 kb — encodes the capsid protein VP1 (128 kDa — kilodaltons) on one strand and three non-structural proteins — NS1 of 14 kDa, NS2 of 37 kDa and NS3 of 55 kDa — on the complementary strand. DNA2 (also known as VD2) — the smaller segment of 6 kb — encodes the capsid protein VP2 (133 kDa) on one strand and the non-structural protein NS4 (27 kDa) on the complementary strand. The open reading frame 4 (VD1-ORF4) is 3318 nucleotides (bases) in length and encodes a predicted (3318/3 − 1 =) 1105 amino acid protein which has a conserved DNA polymerase motif. It appears to encode at least 2 other proteins including one of ~53 kDa that forms part of the virion.

Evolution Comprehensive analysis of bidnavirus genes has shown that these viruses have evolved from a parvovirus ancestor from which they inherit a jelly-roll capsid protein and a superfamily 3 helicase. It has been further suggested that the key event that led to the separation of the bidnaviruses from parvoviruses was the acquisition of the PolB gene. A likely scenario has been proposed under which the ancestral parvovirus genome was integrated into a large virus-derived DNA transposon of the Polinton/Maverick family (polintoviruses) resulting in the acquisition of the polintovirus PolB gene along with terminal inverted repeats. Bidnavirus genes for a minor structural protein (putative receptor-binding protein) and a potential novel antiviral defense modulator were derived from dsRNA viruses (Reoviridae) and dsDNA viruses (Baculoviridae), respectively.

References

External links Bidensovirus ~ ViralZone page. The top image erraneously shows a monopartite genome, text and genome map are right (March 30, 2021).

Illustrations

Worked examples

Example 1 — a first encounter with Bidensovirus

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

In research: Bidensovirus 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 Bidensovirus 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: Bidensovirus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Single-stranded DNA viruses, Virus genera, so understanding it makes those chapters shorter.
In everyday life: Look for Bidensovirus 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Bidensovirus” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Bidensovirus in 20 minutes

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

Frequently asked questions

What is Bidensovirus in simple terms?

Why does Bidensovirus 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 Bidensovirus?

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 Bidensovirus.