The inherent leakiness of the sinus nodal fibers to sodium and calcium ions causes their self-excitation.

TLS Online TPP Program

#Id: 10063

#Unit 4. Cell Communication and Cell Signaling

CAMs fall into one of four major families: 

Cadherins

Immunoglobulin (Ig) superfamily

Integrins

Selectins

TLS Online TPP Program

#Id: 2076

#Unit 8. Inheritance Biology

During human chromosome rearrangements deletion onto the chromosome 5 in the short arm causes Cri-du-chat syndrome.

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#Id: 506

#Unit 2. Cellular Organization

The rate of loss of single-stranded (ss) DNA during renaturation is a second-order rate process

 

TLS Online TPP Program

#Id: 2360

#Unit 5. Developmental Biology

Second possible mechanisms for neoblast specification during regeneration:

Multipotent progenitor cells are positioned throughout the planarian with their lineages specified based on their position. These divide and produce postmitotic blastema cells that differentiate into their specified fates.

 

TLS Online TPP Program

#Id: 8763

#Unit 1. Molecules and their Interaction Relevant to Biology

Thermophilic proteins have increased amounts of Arg, increased occurrence of Ala in helices, and Gly/Ala substitutions (which affect the entropy of the denatured state, and thus its free energy) and increased number of salt bridges.