Inactivation of the X chromosome in females is governed by the n–1 rule

TLS Online TPP Program

#Id: 9462

#Unit 4. Cell Communication and Cell Signaling

All STAT proteins contain: 

an N-terminal DNA-binding domain

an SH2 domain

a C-terminal domain with a critical tyrosine residue

TLS Online TPP Program

#Id: 7195

#Unit 5. Developmental Biology

Class III MHC genes encode several different proteins, some with immune functions, include the complement components C4, C2, and factor B, TNF-α and Lymphotoxin-α [TNF- α].

TLS Online TPP Program

#Id: 9316

#Unit 4. Cell Communication and Cell Signaling

Light absorption by rhodopsin→activation of a cGMP PDE → hydrolyzes cGMP to 5′-GMP→ cGMP levels  drop →channel close →membrane hyperpolarization→reduction in NT release→transmitted to brain

TLS Online TPP Program

#Id: 3102

#Unit 3. Fundamental Processes

An origin at which replication is initiated. It may also have a terminus at which replication stops.

TLS Online TPP Program

#Id: 7361

#Unit 5. Developmental Biology

On the left side of Hensen’s node, Sonic hedgehog (Shh) activates Cerberus, which stimulates BMPs to induce the expression of Nodal