biology

Mrakia frigida

Mrakia frigida 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 Mrakia frigida rather than just read about it. In short: Mrakia frigida is a species of fungus in the order Cystofilobasidiales. The species occurs in both a yeast and hyphal state, the latter producing teliospores from which basidia emerge.

Key takeaways

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

Reference excerpt

Mrakia frigida is a species of fungus in the order Cystofilobasidiales. The species occurs in both a yeast and hyphal state, the latter producing teliospores from which basidia emerge. It was originally isolated in its yeast state from Antarctic snow.

Growth temperature Mrakia frigida has been classified as an obligate psychrophile since it grows well at subzero temperatures and is unable to grow at temperatures above 18–20 °C (64–68 °F). Mrakia frigida grows at −2–20 °C (28–68 °F). Rapid growth of Mrakia frigida occurs at 17 °C (63 °F), and slight increase in temperature results in growth decrease. Its maximum growth temperature is 19–20 °C (66–68 °F) when glucose is used as carbon source and 17–18 °C (63–64 °F) when ethanol is used. The growth rate of Mrakia frigida on glucose as substrate for a given temperature is higher than that on ethanol. The cell yield of Mrakia frigida is maximum at subzero temperatures.

Membrane lipid composition There is a positive correlation between the growth temperature and the degree of fatty-acid unsaturation of the cell lipids of Mrakia frigida. The variation in the degree of fatty acid unsaturation of the yeast indicates its ability to alter the cellular component is fundamental to adaptation to environmental changes. The extent to such ability determines the growth temperature limits of Mrakia frigida. The lower limit is the point at which its membrane lipids solidify and the upper limit is the point at which its membrane lipids melt.

Cytochrome concentration Mrakia frigida shows absorption bands at room temperature characteristic of cytochromes aa3, b and c. The concentration to the cytochromes in Mrakia frigida is negatively related to its membrane-lipid unsaturation rate. At the maximum growth temperatures when the degree of lipid unsaturation of the cell membrane is high, the final cell yield is less than at lower temperatures when membrane-lipid unsaturation rate is low. This indicates glucose repression of cytochrome synthesis occurs at high degree of lipid unsaturation. However, a high concentration of cytochrome c is observed at the maximum growth temperatures of Mrakia frigida. This phenomenon may be an attempt by the cells to compensate for the decrease in cytochrome a+a3 by involving alternative pathways of electron transport.

Functions of cellular membranes The positive correlation relationship between the growth temperature of Mrakia frigida and the membrane-lipid unsaturation rate, and the negative relationship between the membrane-lipid unsaturation rate and cytochrome concentration in cells indicate the membrane structure and composition are significant to temperature adaptation in Mrakia frigida. Manipulation of the fatty-acid unsaturation index allows Mrakia frigida to alter its membrane fluidity, and function with changing temperatures.

References

Worked examples

Example 1 — a first encounter with Mrakia frigida

Start with the simplest possible case. Write down what Mrakia frigida 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 Mrakia frigida 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 Mrakia frigida 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 Mrakia frigida

In research: Mrakia frigida 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 Mrakia frigida 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: Mrakia frigida is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fungi described in 1969, Fungi of Antarctica, Fungus species, so understanding it makes those chapters shorter.
In everyday life: Look for Mrakia frigida 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 Mrakia frigida in 20 minutes

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

Frequently asked questions

What is Mrakia frigida in simple terms?

Mrakia frigida is a species of fungus in the order Cystofilobasidiales. The species occurs in both a yeast and hyphal state, the latter producing teliospores from which basidia emerge.

Why does Mrakia frigida 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 Mrakia frigida?

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 Mrakia frigida.