Question

Which of the following is the correct extended form of BLAST?

• A. Basic Local Alignment Search Tool
• B. Best Local Alignment Search Tool
• C. Basic Local Alignment Similarity Tool
• D. Basic Local Alignment Search Technique

Hint:

Remember: BLAST is a Tool, not a "Technique" or "Searcher."
It is Basic (Simple/Fast) and Local (looks for fragments).
It is the "Google" of the biological sequence world!

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks for the full expansion of the acronym BLAST, which is one of the most widely used bioinformatics algorithms for analyzing biological sequence information.

Step 2: Detailed Explanation:

• Definition: BLAST stands for Basic Local Alignment Search Tool. It was first published in 1990 by Altschul and colleagues at the NCBI (National Center for Biotechnology Information).

• Function: BLAST allows a researcher to compare a "query" sequence (DNA or protein) with a massive database of known sequences to find regions of similarity.

• "Local" Alignment: Unlike "Global" alignment which tries to align sequences from start to finish, BLAST focuses on finding the best matching sub-sequences (local regions). This makes it much faster and better for finding conserved domains in large genomes.

• Significance: It helps identify species, find homologous genes in different organisms, and predict the function of a newly sequenced gene based on its similarity to known genes.

• Variations: Common versions include blastn (DNA vs DNA), blastp (Protein vs Protein), and blastx (translated DNA vs Protein).

Step 3: Final Answer:
The correct full form is Basic Local Alignment Search Tool.