Sos is a GEF that catalyzes conversion of inactive GDP bound Ras to the active GTP-bound form.

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#Unit 4. Cell Communication and Cell Signaling

Classes of Antibody Heavy Chains

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#Unit 4. Cell Communication and Cell Signaling

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#Unit 7. System Physiology – Animal

In the thick segment of the ascending loop of Henle  reabsorption mechanism is load-dependent.

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#Unit 6. System Physiology – Plant

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#Unit 2. Cellular Organization

Deletions in two genes, neither of which is lethal by itself, are introduced into the same strain. If the double mutant dies, the strain is called a synthetic lethal. This technique has been used to great effect with yeast, where the isolation of double mutants can be automated. The procedure is called synthetic genetic array analysis (SGA)