β-Carotene is the precursor of vitamin A1.
Oxidation at C-15 converts retinol to the aldehyde, retinal, and further oxidation produces retinoic acid, a hormone that regulates gene expression. 

TLS Online TPP Program

#Id: 8042

#Section 2: General Biology

A system to unambiguously describe the configurations of molecules with more than one asymmetric center was devised in 1956 by Robert Cahn, Christopher Ingold, and Vladimir Prelog. In the Cahn–Ingold– Prelog or RS system

TLS Online TPP Program

#Id: 8395

#Section 3: Genetics, Cellular and Molecular Biology

Sarcomere

Within each skeletal muscle cell are many myofibrils consisting of a repeating array of a specialized structure

TLS Online TPP Program

#Id: 7934

#Section 3: Genetics, Cellular and Molecular Biology

The two key components in protein targeting in ER:

Signal recognition particle (SRP)

SRP receptor

TLS Online TPP Program

#Id: 9295

#Section 2: General Biology

The nitrate reductase dimer- Three binding domains

TLS Online TPP Program

#Id: 9148

#Section 3: Genetics, Cellular and Molecular Biology

Nonrandom Mating Affects the Genotypic Frequencies of a Population.