Amyloplasts that function as gravity sensors are called statoliths, and the specialized gravity-sensing cells in which they occur are called statocytes

TLS Online TPP Program

#Id: 7371

#Unit 5. Developmental Biology

The transcription factors encoded by the pair-rule genes activate the segment polarity genes, whose mRNA and protein products divide the embryo into 14-segment-wide units, establishing the periodicity of the embryo. 

TLS Online TPP Program

#Id: 3977

#Unit 2. Cellular Organization

The degree of supercoiling of bacterial DNA is maintained by regulation of the net activity of topoisomerases, I and II.

TLS Online TPP Program

#Id: 8310

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 9566

#Unit 11. Evolution and Behavior

Hamilton’s rule:  It states that an allele that causes an altruistic behavior will spread if the following condition is met (rb>C)

TLS Online TPP Program

#Id: 9334

#Unit 4. Cell Communication and Cell Signaling

An evolutionarily conserved family of signaling molecules, TGF-β superfamily includes: 

TGF-β family, Nodal and activin families, BMPs, Vg1 family, GDNF, AMH