AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is a promoter?
A
A eukaryotic gene containing sequences of nucleotides.
B
A region of DNA which have specific base sequences that signal enzymes to bind to that region.
C
A region of DNA with that produces enzymes.
Explanation: 

Detailed explanation-1: -In genetics, a promoter is a sequence of DNA to which proteins bind to initiate transcription of a single RNA transcript from the DNA downstream of the promoter. The RNA transcript may encode a protein (mRNA), or can have a function in and of itself, such as tRNA or rRNA.

Detailed explanation-2: -A promoter, as related to genomics, is a region of DNA upstream of a gene where relevant proteins (such as RNA polymerase and transcription factors) bind to initiate transcription of that gene. The resulting transcription produces an RNA molecule (such as mRNA).

Detailed explanation-3: -RNA polymerase binds to a sequence of DNA called the promoter, found near the beginning of a gene.

Detailed explanation-4: -Transcription factors are proteins that bind to enhancer or promoter regions and interact to activate or repress the transcription of a particular gene. Most transcription factors can bind to specific DNA sequences.

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