The overall effect is a significant net dipole for the a helix that gives a partial positive charge at the amino end and a partial negative charge at the carboxy end of the a helix. 

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#Id: 1020

#Unit 5. Developmental Biology

Specification of the ectoderm is accomplished during gastrulation, by regulating the levels of BMP.

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#Id: 2601

#Unit 13. Methods in Biology

A modification of overlap extension PCR may also be used to construct directed mutations; this is termed megaprimer PCR .

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#Id: 2793

#Unit 13. Methods in Biology

The length of column containing one theoretical plate is referred to as the plate height, H, which has units of length normally in micrometers.

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#Id: 6944

#Unit 8. Inheritance Biology

Heterozygous for inversions also exhibit reduced recombination among genes located in the inverted region.

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#Id: 349

#Unit 1. Molecules and their Interaction Relevant to Biology

The oxaloacetate is converted to PEP by phosphoenolpyruvate carboxykinase. This Mg2+ dependent reaction requires GTP as the phosphoryl group donor.