As cells enter the primitive streak, they undergo an epithelial-to-mesenchymal transformation.

TLS Online TPP Program

#Id: 6499

#Unit 3. Fundamental Processes

RNA polymerase II terminates after a short distance; small oligonucleotides of 4–5 nt are unstable; crystal structures of these RNA/DNA hybrids are unordered. Only longer hybrids have proper base pairing. The short RNA products are degraded rapidly. The suggestion is that this abortive initiation is a form of promoter proofreading.

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#Id: 2202

#Unit 10. Ecological Principles

Ecosystem replacement - replaces the original community with a different one

TLS Online TPP Program

#Id: 8487

#Unit 1. Molecules and their Interaction Relevant to Biology

Co and N atoms of the peptide grouping are both in planar sp2 hybridization and the Co and O atoms are linked by a p bond, leaving the nitrogen with a lone pair of electrons in a 2p orbital.

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#Id: 3723

#Unit 10. Ecological Principles

Species richness - which is a count of the number of species.

TLS Online TPP Program

#Id: 4843

#Unit 13. Methods in Biology

Again, H0, the null hypothesis, consists of the statement that, “There is no bear”, wherein, if a wolf is indeed present, is a type II error on the part of the investigator.