There are three pathways for the synthesis of JAs, including the octadecane pathway starting from α-linolenic acid (18:3) and the hexadecane pathway starting from hexadecatrienoic acid (16:3). 

All three pathways require three reaction sites: the chloroplast, peroxisome, and cytoplasm. 

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#Id: 10311

#Unit 4. Cell Communication and Cell Signaling

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#Id: 7694

#Unit 1. Molecules and their Interaction Relevant to Biology

                                                        aa motif / Coiled-coils

3.6 a.a / turn in helix 

abcdefg 'a' &'d’ are hydrophobic residues 'e' and 'g' are found to be charged amino 

7.2 a.a / 2 turns acids 

 —7 amino acids per 2 turns in the helix 

For every turn there could be one hydrophobic residue coming same side of the helix 

Ex: GCN4

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#Id: 2132

#Unit 8. Inheritance Biology

If a single crossover takes place in the inverted region an unusual structure results

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#Id: 8086

#Unit 1. Molecules and their Interaction Relevant to Biology

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#Id: 1857

#Unit 3. Fundamental Processes

Constitutive active housekeeping genes and developmentally regulated genes have TATA-less promoters.