The multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.

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#Id: 1073

#Unit 5. Developmental Biology

Class A and B activities are required for the formation of petals.

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#Id: 1074

#Unit 5. Developmental Biology

Class B and C activities form stamens.

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#Id: 1075

#Unit 5. Developmental Biology

Class C activity alone specifies carpels.

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#Id: 1076

#Unit 5. Developmental Biology

Many of the genes that determine floral organ identity are MADS box genes, including AG, PI, and AP3 genes of Arabidopsis

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#Id: 1077

#Unit 5. Developmental Biology

The MADS box gene form tetramers that bind to CC(A/T)6GG sequences, called CArG-box, in the regulatory regions of their target genes.

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#Id: 1078

#Unit 5. Developmental Biology

According to the Quartet Model, floral organ identity is regulated by tetrameric complexes of the ABCE proteins.