Presentation of nonpeptide (lipid and lipid-linked) antigens derived from pathogens involves the nonclassical class I–like CD1 molecule.

TLS Online TPP Program

#Id: 2303

#Unit 3. Fundamental Processes

Mechanism: How Polymerase Find Promoter Sequences

TLS Online TPP Program

#Id: 8588

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 2371

#Unit 5. Developmental Biology

In regenerating planaria, β-catenin is activated in the posterior-facing blastema, which generates a tail.

TLS Online TPP Program

#Id: 3592

#Unit 3. Fundamental Processes

A codon is a triplet of nucleotides that codes for a specific amino acid.

TLS Online TPP Program

#Id: 9563

#Unit 11. Evolution and Behavior

Theory of recapitulation - Ernst Haeckel

He proposed that the embryonic development of an individual organism (its ontogeny) followed the same path as the evolutionary history of its species (its phylogeny).