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.

C.Identify the promoter regions in the model molecule.

Explanation:

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.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.