biology

Phycomyces blakesleeanus

Phycomyces blakesleeanus 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 Phycomyces blakesleeanus rather than just read about it. In short: Phycomyces blakesleeanus is a filamentous fungus in the Order Mucorales of the phylum Zygomycota or subphylum Mucoromycotina. The spore-bearing sporangiophores of Phycomyces are very sensitive to different environmental signals including light, gravity, wind, chemicals, and adjacent objects.

Key takeaways

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

Reference excerpt

Phycomyces blakesleeanus is a filamentous fungus in the Order Mucorales of the phylum Zygomycota or subphylum Mucoromycotina. The spore-bearing sporangiophores of Phycomyces are very sensitive to different environmental signals including light, gravity, wind, chemicals, and adjacent objects. They exhibit phototropic growth: most Phycomyces research has focused on sporangiophore photobiology, such as phototropism and photomecism ('light growth response'). Metabolic, developmental, and photoresponse mutants have been isolated, some of which have been genetically mapped. At least ten different genes (named madA through to madJ) are required for phototropism. The madA gene encodes a protein related to the White Collar-1 class of photoreceptors that are present in other fungi, while madB encodes a protein related to the White Collar-2 protein that physically bind to White collar 1 to participate in the responses to light. Phycomyces also exhibits an avoidance response, in which the growing sporangiophore avoids solid objects in its path, bending away from them without touching them, and then continuing to grow upward again. This response is believed to result from an unidentified "avoidance gas" that is emitted by the growing zone of the sporangiophore. This gas would concentrate in the airspace between the Phycomyces and the object. This higher concentration would be detected by the side of the sporangiophore's growing zone, which would grow faster, causing the sporangiophore to bend away. Phycomyces blakesleeanus became the primary organism of research of the Nobel laureate Max Delbrück starting in the 1950s when Delbrück decided to switch from research on bacteriophage and bacteria to P. blakesleeanus. A genetic linkage map was developed for P. blakesleeanus. This genetic map was constructed from 121 progeny of a cross between two wild type isolates and involved 134 markers. The markers were mostly PCR-based restriction fragment length polymorphisms. Zygospores are the sexual structures of P. blakesleeanus in which the diploid zygote is formed and meiosis is presumed to take place. The data from this cross provided supporting evidence for meiosis during zygospore development.

References

External links Phycomyces at Zygomycetes.org Phycomyces blakesleeanus genome sequencing project (for strain NRRL1555) Bergman, K; Burke, P V; Cerdá-Olmedo, E; David, C N; Delbrück, M; Foster, K W; Goodell, E W; Heisenberg, M; Meissner, G; Zalokar, M; Dennison, D S; Shropshire, W (March 1969). "Phycomyces". Bacteriological Reviews. 33 (1): 99–157. doi:10.1128/br.33.1.99-157.1969. PMC 378314. PMID 4889151. Phycomyces strains at the FGSC

Illustrations

Worked examples

Example 1 — a first encounter with Phycomyces blakesleeanus

Start with the simplest possible case. Write down what Phycomyces blakesleeanus 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 Phycomyces blakesleeanus 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 Phycomyces blakesleeanus 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 Phycomyces blakesleeanus

In research: Phycomyces blakesleeanus 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 Phycomyces blakesleeanus 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: Phycomyces blakesleeanus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fungi described in 1925, Fungus species, Zygomycota, so understanding it makes those chapters shorter.
In everyday life: Look for Phycomyces blakesleeanus 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 Phycomyces blakesleeanus in 20 minutes

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

Frequently asked questions

What is Phycomyces blakesleeanus in simple terms?

Why does Phycomyces blakesleeanus 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 Phycomyces blakesleeanus?

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 Phycomyces blakesleeanus.