biology

Thermotoga

Thermotoga 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 Thermotoga rather than just read about it. In short: Thermotoga is a genus of the phylum Thermotogota. Members of Thermotoga are hyperthermophilic bacteria whose cell is wrapped in a unique sheath-like outer membrane, called a "toga".

Key takeaways

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

Reference excerpt

Thermotoga is a genus of the phylum Thermotogota. Members of Thermotoga are hyperthermophilic bacteria whose cell is wrapped in a unique sheath-like outer membrane, called a "toga". The members of the phylum stain Gram-negative as they possess a thin peptidoglycan in between two lipid bilayers, albeit both peculiar. The peptidoglycan is unusual as the crosslink is not only meso-diaminopimelate as occurs in Pseudomonadota, but D-lysine. The species are anaerobes with varying degrees of oxygen tolerance. They are capable of reducing elemental sulphur (S0) to hydrogen sulphide. Whether thermophily is an innovation of the lineage or an ancestral trait is unclear and cannot be determined. The genome of Thermotoga maritima was sequenced in 1999, revealing several genes of archaeal origin, possibly allowing its thermophilic adaptation. The CG (cytosine-guanine) content of T. maritima is 46.2%; most thermophiles in fact have high CG content; this has led to the speculation that CG content may be a non-essential consequence to thermophily and not the driver towards thermophily.

Name The paper and the chapter in Bergey's manual were authored by several authors including the microbiologists Karl Stetter and Carl Woese. The Neo-Latin feminine name "thermotoga" means "the hot outer garment", being a combination of the Greek noun θέρμη (therme, heat) or more correctly the adjective θερμός, ή, όν (thermos, e, on, hot) and the Latin feminine noun toga (the Roman outer garment).

Members and relatives The precise relation of the Thermotogota to other phyla is debated (v. bacterial phyla): several studies have found it to be deep-branching (in Bergey's manual it appeared in fact in "Volume I: The Archaea and the deeply branching and phototrophic Bacteria"), while other have found Firmicutes to be deep-branching with Thermotogota clustering away from the base. The type species of the genus is T. maritima, first described in 1986. At the time, it was the first species of the phylum to be described. The genus Thermotoga now contains three official species. Recently eight species were transferred out of the genus and most of them ended up within the genus Pseudothermotoga by Bhandari & Gupta 2014. T. subterranea strain SL1 was found in a 70 °C deep continental oil reservoir in the East Paris Basin, France.

Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI)

Footnotes

See also List of bacterial orders List of bacteria genera

References

Illustrations

Worked examples

Example 1 — a first encounter with Thermotoga

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

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

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

Frequently asked questions

What is Thermotoga in simple terms?

Thermotoga is a genus of the phylum Thermotogota. Members of Thermotoga are hyperthermophilic bacteria whose cell is wrapped in a unique sheath-like outer membrane, called a "toga".

Why does Thermotoga 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 Thermotoga?

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 Thermotoga.