Gap genes encode transcription factors, and differing combinations and concentrations of gap gene proteins regulate the transcription of pair-rule genes, which divide the embryo into periodic units.

TLS Online TPP Program

#Id: 4735

#Unit 5. Developmental Biology

In C. elegans

When sperm fuses with the egg cell membrane, polyspermy is prevented by the rapid synthesis of chitin by the newly fertilized egg.

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#Id: 4771

#Unit 5. Developmental Biology

POP-1 activates the TBX-35 gene.

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#Id: 8965

#Unit 11. Evolution and Behavior

Most protein-encoding genes, the synonymous rate of change is considerably higher than the nonsynonymous rate because synonymous mutations are tolerated by natural selection

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#Id: 8625

#Unit 2. Cellular Organization

Human SCF complexes contain: 

Three core components - Cul1 subunit, RBX1, Skp1 

and a substrate-targeting F-box protein

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#Id: 353

#Unit 1. Molecules and their Interaction Relevant to Biology

Transketolase requires the cofactor thiamine pyrophosphate (TPP)