Question

Molecular basis of organ differentiation depends on the modulation in transcription by

• A. RNA polymerase
• B. Ribosome
• C. Transcription factor
• D. Anticodon

Answer 1

Answer: (C)

Transcription factor

Molecular basis of organ differentiation depends on the modulation in transcription by transcription factor. A transcription factor is a protein that binds to specific DNA sequences, thereby controlling the rate of transcription of genetic information from DNA to messenger RNA. Transcription factors are essential for the regulation of gene expression and are, as a consequence, found in all living organisms. The number of transcription factors found within an organism increases with genome size, and larger genomes tend to have more transcription factors per gene. Transcription factors bind to either enhancer or promoter regions of DNA adjacent to the genes that they regulate. Depending on the transcription factor, the transcription of the adjacent gene is either up- or down-regulated.