In peptidoglycan the amino acids occur in an alternating pattern of D and L forms

TLS Online TPP Program

#Id: 9036

#Unit 4. Cell Communication and Cell Signaling

The affinity of a signal molecule’s binding to its receptor is quantified by the dissociation constant for binding (Kd).

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#Id: 9770

#Unit 6. System Physiology – Plant

Extracellular basic hydroxyproline rich glycoproteins

(HRGPs) via the tyrosine in the repeated motif PPPPY that reacts with H2O2.

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#Id: 3730

#Unit 10. Ecological Principles

The Shannon index
Direct related with Diversity and increases with addition of species and even distribution of species.

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#Id: 2150

#Unit 9. Diversity of Life Forms

It is not surprising that size, shape, coloration, and many other traits undergo convergent evolution in diverse lineages

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#Id: 7077

#Unit 3. Fundamental Processes

ThrRS has the opposite problem: It must synthesize Thr–tRNAThr but not Val–tRNAThr. Specificity is conferred by the aminoacylation site, which contains a Zn2+ ion that is coordinated by the side chain OH group of threonine. Valine cannot coordinate the Zn2+ in this way and hence does not undergo adenylylation by ThrRS.  A separate editing site deals with misacylated Ser–tRNAThr. TyrRS distinguishes between tyrosine and phenylalanine through hydrogen missing from the repertoire are GlnRS and asparaginyl-tRNA synthetase (AsnRS). To synthesize Gln-tRNAGln and Asn-tRNAAsn, these organisms possess distinct glutamyl-tRNA synthetase (GluRS) and aspartyl-tRNA synthetase (AspRS) enzymes that are nondiscriminating (ND). GluRSND synthesizes both Glu-tRNAGlu as well as misacylated Glu-tRNAGln; AspRSND synthesizes both Asp-tRNAAsp and misacylated Asp-tRNAAsn.