A. A transcription unit in DNA is defined primarily by three regions : promoter, structural gene and terminator.
B. The promoter is said to be located towards the 5'-end of the structural gene.
C. The promoter is a DNA sequence that provides binding site for RNA polymerase.
D. The promoter defines the template and coding strands.
E. The terminator is located towards the 3'-end of the coding strand and it defines the end of the process of transcription.
Choose the correct answer from the options given below :
Transcription Unit Components Identified
A transcription unit is the fundamental segment of DNA that directs the synthesis of a functional RNA molecule. It consists of three essential regions.
Evaluating Transcription Unit Statements
- Statement A: Correct. A transcription unit is defined by the promoter (initiation site), the structural gene (coding sequence), and the terminator (termination site).
- Statement B: Correct. The promoter sequence is located upstream of the structural gene, conventionally towards the 5'-end of the DNA template strand that is being transcribed.
- Statement C: Correct. The promoter region serves as the specific binding site for the enzyme RNA polymerase, which is crucial for initiating transcription.
- Statement D: Correct. By defining the start site and direction of transcription, the promoter determines which of the two DNA strands will function as the template strand and which as the coding strand.
- Statement E: Correct. The terminator sequence is located downstream of the structural gene, towards the 3'-end relative to the coding strand, and it signals the termination point for transcription.
Finalizing Correct Statements
All the statements (A, B, C, D, and E) provide accurate descriptions of the components and functions related to a transcription unit in DNA.
Therefore, the correct choice must include all these valid statements.
Similar Questions
- Arrange the following steps of DNA fingerprinting in a correct sequence.
A. Isolation of DNA and its digestion by restriction endonucleases.
B. Hybridisation using a labelled VNTR probe.
C. Transferring of separated DNA fragments to synthetic membranes.
D. Detection of hybridised DNA fragments by autoradiography.
E. Separation of DNA fragments by electrophoresis.
Choose the correct answer from the options given below : - In the lac operon, the z gene codes for :
- Which of the following statements are correct with reference to packaging of DNA helix ?
A. Histones are organized to form a unit of eight molecules called histone octamer.
B. Histones are negatively charged basic proteins.
C. Histones are rich in the basic amino acid residues - lysine and arginine.
D. The positively charged DNA is wrapped around the histone octamer to form nucleosome.
E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins.
Choose the correct answer from the options given below : - The correct statement with regard to the secondary structure of DNA/RNA is :
- Which of the following statements about lac-operon is correct ?
- Which of the following enzymes synthesizes precursor mRNA ?
Important Questions from Molecular Biology
- Arrange the following steps of DNA fingerprinting in a correct sequence.
A. Isolation of DNA and its digestion by restriction endonucleases.
B. Hybridisation using a labelled VNTR probe.
C. Transferring of separated DNA fragments to synthetic membranes.
D. Detection of hybridised DNA fragments by autoradiography.
E. Separation of DNA fragments by electrophoresis.
Choose the correct answer from the options given below : - In the lac operon, the z gene codes for :
- Which of the following statements are correct with reference to packaging of DNA helix ?
A. Histones are organized to form a unit of eight molecules called histone octamer.
B. Histones are negatively charged basic proteins.
C. Histones are rich in the basic amino acid residues - lysine and arginine.
D. The positively charged DNA is wrapped around the histone octamer to form nucleosome.
E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins.
Choose the correct answer from the options given below : - The correct statement with regard to the secondary structure of DNA/RNA is :
- Which of the following statements about lac-operon is correct ?
