A single activated rhodopsin protein activates 

~13 transducin molecules in the few seconds before the covalent bond between the opsin protein and all-trans-retinal is spontaneously cleaved

TLS Online TPP Program

#Id: 7937

#XL - Q Biochemistry

Once the ER signal sequence emerges from the ribosome, it is bound by a signal recognition particle (SRP)

TLS Online TPP Program

#Id: 8627

#XL - T Zoology

phosphoserine/threonine-binding F-box protein is Skp2, which uses a series of leucine-rich repeats to bind to target proteins only when they are phosphorylated.

TLS Online TPP Program

#Id: 8178

#XL - Q Biochemistry

Peroxisomes major sites of oxygen utilization (carrying out oxidative reactions).

TLS Online TPP Program

#Id: 1967

#XL - T Zoology

TLS Online TPP Program

#Id: 9804

#XL - R Botany

PAS-related domain (PRD) repeats mediate phytochrome dimerization. 

The PRD domain targets the Pfr form of phyB to the nucleus, although it lacks a canonical nuclear localization signal (NLS).