Examine the gene network regulatory motifs in the figure. (To recap, (green) lin

Question

Examine the gene network regulatory motifs in the figure. (To recap, (green) lines that end in an arrowhead denote a positive regulator, while (red) lines that end in a crossbar denote a negative regulator). Which network motifs represent negative feedback loops ?

1 A,B and C.

2 D only.

3 B, C and D.

4 A only.

5 None of the regulatory motifs represents a negative feedback loop.

(A) ACTIVATING INPUT (B) ACTIVATING ACTIVATING INPUT INPUT GENE GENE Y GENE GENE GENE ZI GENE Z GENE GENE (D) ACTIVATING INPUT GENEX GENE GEN

Explanation / Answer

Option 2 is correct.

Negative feedback- The diminuation or counteraction of an effect by its own influence on the process giving rise to it, as when a high level of a particular gene or hormone may inhibit further secretion of that or where the result of a certain action may inhibit further performance of that function.

In A, increase level of gene y inhibit the function of gene x, thats why further reaction is not takes plance.

Same reactions are take place in B and C.

But in D, gene x - gene y - gene -z are formed.

And high level gene z has negative effect on the function of gene x.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.