Final answer:
To determine if a DNA sequence codes for a protein that matches a protein in the database, perform a search using the BLAST tool. Input the DNA sequence and specify the species. The results will show matches and the locations in the genome.
Step-by-step explanation:
To determine if a DNA sequence codes for a protein that matches a protein in the database, you can perform a search using a tool called BLAST (Basic Local Alignment Search Tool).
First, you need to access the Nucleotide Blast option under Basic Blast. Then, input the DNA sequence into the query sequence box and specify the species you want to compare it with, such as 'human'.
Once you click 'BLAST', the tool will compare the inputted sequence against known sequences in the database and show the results, including the locations where the sequence is found in the genome. You can further explore the matches by examining the graphics and sequences surrounding the selected hit.