George is studying a computer model of a DNA molecule, in which the letters A, C, G, and T are listed in a very long sequence. The model includes a total of 2000 genes that are scattered along the full length of the molecule. The genes make up only a small fraction of the molecule.

George wants to identify the locations of the genes. Which would be the MOST USEFUL first step to follow?

A. Divide the model molecule into 2000 segments of equal size.
B. Identify all of the start codons in the model molecule.
C. Identify the promoter regions in the model molecule.
D. Divide the model molecule into three-letter pieces.

Promoters are the sequences present close to the upstream of start site. Promoter is the sequence that serves as binding site for RNA polymerase to start the process of transcription. Since promoter sequences are consensus sequences and all genes have promoters associated with them; identification of promoter sequences can give location of the gene on the otherwise large DNA molecule.

mahima6824soni mahima6824soni · Answer 2 · 2022-02-09T09:33:11+01:00

To identify the location of the genes, the most useful step is to identify the promoter regions in the model molecule.

The correct option is (C).

What are genes?

Genes are small bead-like structures present in the chromosomes. Genes are the key to the heredity of an organism. It reflects all the traits present in the body.

Promoter regions are present in upstream of the DNA strand, generally in the 5' area of the DNA.

This region is the initiation point when the RNA polymerase begins to transcribe the genes.

Thus, to identify the gene location, the useful step is an option (C) to identify the promoter regions in the model molecule.

Learn more about genes, here:

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