In Drosophila, the X chromosome contains genes encoding four transcription factors that activate the critical gene in Drosophila sex determination, the X-linked locus Sex-lethal (Sxl).

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#Id: 5801

#Unit 7. System Physiology – Animal

TRH receptors in the pituitary cell membrane activates the phospholipase second messenger system, leads to TSH release.

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#Id: 7425

#Unit 5. Developmental Biology

Cell Aggregation & Differentiation is common to all Dictyostelids. It consists of an interconnected programme of cell movement and cell differentiation.

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#Id: 5329

#Unit 7. System Physiology – Animal

Rapid Ventricular Filling

Ventricular pressure remains low, because the ventricle is still relaxed and compliant.

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#Id: 4718

#Unit 13. Methods in Biology

Electron delocalisation extends throughout the cyclic tetrapyrrole ring of porphyrins and gives rise to an intense transition at 400 nm called the Soret band.

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#Id: 9005

#Unit 6. System Physiology – Plant

Most of the regulation between nucleus and plastids is anterograde: products of nuclear genes control the transcription and translation of plastid genes..