biology

Semaphorin 3E

Semaphorin 3E 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 Semaphorin 3E rather than just read about it. In short: Semaphorin 3E is a protein that in humans is encoded by the SEMA3E gene. Function Semaphorin are a large family of conserved secreted and membrane associated proteins which possess a semaphorin (Sema) domain and a PSI domain (found in plexins, semaphorins and integrins) in the N-terminal extracellular portion.

Key takeaways

Semaphorin 3E belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Semaphorin 3E to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Semaphorin 3E from memory before moving on to harder problems.

Reference excerpt

Semaphorin 3E is a protein that in humans is encoded by the SEMA3E gene.

Function Semaphorin are a large family of conserved secreted and membrane associated proteins which possess a semaphorin (Sema) domain and a PSI domain (found in plexins, semaphorins and integrins) in the N-terminal extracellular portion. Based on sequence and structural similarities, semaphorins are put into eight classes: invertebrates contain classes 1 and 2, viruses have class V, and vertebrates contain classes 3-7. Semaphorins serve as axon guidance ligands via multimeric receptor complexes, some (if not all) containing plexin proteins. This gene encodes a class 3 semaphorin. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, May 2010].

References

Illustrations

Worked examples

Example 1 — a first encounter with Semaphorin 3E

Start with the simplest possible case. Write down what Semaphorin 3E 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 Semaphorin 3E 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 Semaphorin 3E 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 Semaphorin 3E

In research: Semaphorin 3E 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 Semaphorin 3E 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: Semaphorin 3E is common in secondary-school and first-year university syllabi. It links to neighbouring topics Human chromosome 7 gene stubs, Human genes, so understanding it makes those chapters shorter.
In everyday life: Look for Semaphorin 3E 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 Semaphorin 3E in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Semaphorin 3E 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 Semaphorin 3E out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Semaphorin 3E in simple terms?

Semaphorin 3E is a protein that in humans is encoded by the SEMA3E gene. Function Semaphorin are a large family of conserved secreted and membrane associated proteins which possess a semaphorin (Sema) domain and a PSI domain (found in plexins, semaphorins and integrins) in the N-terminal extracellu…

Why does Semaphorin 3E 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 Semaphorin 3E?

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 Semaphorin 3E.