Substrate-targeting subunits of the APC/C recognize specific sequence motifs on the proteins that the APC/C ubiquitinates. One motif, the destruction box or D-box, has the consensus sequence

RXXLX[D/E]ΦΦΦXN[N/S]

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#Id: 9047

#Unit 4. Cell Communication and Cell Signaling

Monomeric G proteins are evolutionarily ancient, as evidenced by their widespread functions examples include: 

eIF2

EF1α and EF2

Ran

Sar

Rab

Rho, Rac, and Cdc42

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#Id: 527

#Unit 2. Cellular Organization

Genes that share a common ancestry have similar organizations with conservation of the positions (of at least some) of the introns.

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#Id: 4988

#Unit 6. System Physiology – Plant

As shading increases, the R:FR ratio decreases.

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#Id: 6800

#Unit 3. Fundamental Processes

the RNA guide strand recruits RISC to a target RNA. It has been argued that the length of 22 nucleotides is just long enough to specify a single target sequence uniquely in the large genomes of complex eukaryotes using RNA–RNA base pairing.

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#Id: 4789

#Unit 5. Developmental Biology

In embryos whose mothers have mutant glp-1, ABp is transformed into an ABa cell