Question

BLAST stands for:

• A. Basic Local Alignment Search Tool
• B. Basic Local Alignment Sequence Tool
• C. Bioinformatics Local Alignment Search Tool
• D. Biomolecular Local Alignment Search Tool

Hint:

BLAST is always remembered as Basic Local Alignment Search Tool. The word “Local” is important because BLAST searches for local regions of similarity between sequences.

Answer 1

The Correct Option is A

Concept:
BLAST is one of the most commonly used tools in bioinformatics. It is used to compare a biological sequence such as a DNA sequence, RNA sequence, or protein sequence with sequences already stored in biological databases.

Step 1: Understand the full form of BLAST.
BLAST stands for: \[ \text{Basic Local Alignment Search Tool} \] Here, \[ \text{B} = \text{Basic} \] \[ \text{L} = \text{Local} \] \[ \text{A} = \text{Alignment} \] \[ \text{S} = \text{Search} \] \[ \text{T} = \text{Tool} \]

Step 2: Understand the meaning of local alignment.
Local alignment means comparing only the most similar regions between two biological sequences. It does not require the entire sequence to match from beginning to end.

Step 3: Purpose of BLAST.
BLAST helps in identifying similarity between a query sequence and known sequences present in databases such as NCBI. It is useful for finding homologous genes, identifying unknown sequences, and studying evolutionary relationships.

Step 4: Check the options.
Option (A) says Basic Local Alignment Search Tool, which is the correct full form of BLAST. \[ \therefore \text{Correct Answer is (A)} \]