The apical ectodermal ridge is a thickening of the ectoderm at the apex of the developing limb bud.

TLS Online TPP Program

#Id: 10479

#Unit 4. Cell Communication and Cell Signaling

Loss-of-function mutations in PTC1 permit cell

proliferation in the absence of an Hh signal

TLS Online TPP Program

#Id: 2980

#Unit 3. Fundamental Processes

It does not exist as an independent unit (e.g., analogous to the ribosome), but assembles de novo at the origin for each replication cycle.

TLS Online TPP Program

#Id: 8496

#Unit 1. Molecules and their Interaction Relevant to Biology

When Phi is fixed at -80º. Clashes occur at all Psi angles except:

+10 to -55º (alpha helix)

+90 to 180 (beta strand

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#Id: 2590

#Unit 13. Methods in Biology

Touchdown PCR, has been devised to increase the specificity of PCR without lowering the efficiency.

 

TLS Online TPP Program

#Id: 2103

#Unit 8. Inheritance Biology

Cri-du-chat syndrome- Deletion on 5, short arm