A student attempts to locate start codons in a region of the genome without the use of the computer algorithm. How many start codons are in the DNA sequence below? Remember, phage use three different codons to indicate the potential start sites of genes (ATG, GTG, TTG).

CCGATGCCGTGCCCTGAAGATTGCCCATGCCGTC

To locate the start codons in the given DNA sequence, you need to analyze the sequence and look for the specific codons that indicate potential start sites of genes. The three codons that can serve as start codons are ATG, GTG, and TTG.

Here's how you can approach this manually:

1. Start by reviewing the DNA sequence:

CCGATGCCGTGCCCTGAAGATTGCCCATGCCGTC

2. Break the sequence into groups of three nucleotides (codons):

CCG ATG CCG TGC CCT GAA GAT TGC CCA TGC CGT C

3. Identify and count the instances where the three potential start codons ATG, GTG, and TTG appear.

In the given sequence, we can see one occurrence of the ATG codon at position 4 (CCG ATG CCG TGC CCT GAA GAT TGC CCA TGC CGT C). However, GTG and TTG do not appear in this particular sequence.

Therefore, there is only one start codon (ATG) present in the given DNA sequence.

CCGATGCCGTGCCCTGAAGATTGCCCATGCCGTC check me.