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: 2232

#Section 3: Genetics, Cellular and Molecular Biology

De novo genes -New Genes in organisms ranging from yeast to humans that did indeed originate from noncoding DNA,

TLS Online TPP Program

#Id: 7832

#Section 2: General Biology

TLS Online TPP Program

#Id: 10322

#Section 2: General Biology

Sometimes the tumor cells up-regulate the expression of anti-apoptotic proteins like BCL-2.

TLS Online TPP Program

#Id: 8189

#Section 3: Genetics, Cellular and Molecular Biology

C-terminal peroxisomal signal sequences Ser–Lys–Leu (PTS1)

N-terminal peroxisomal signal sequences slightly longer and partially hydrophobic (PTS2)

TLS Online TPP Program

#Id: 7734

#Section 2: General Biology

The number of electrons in a neutral atom is equal to the number of protons.