Q. Sensitivity refers to the ability to find as many correct hits as possible.

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Q. The specificity refers to the ability to include incorrect hits.

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Q. In heuristic methods, speed doesn’t vary with the size of database.

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Q. An increase in sensitivity is associated with _______ in selectivity.

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Q. Which of the following is incorrect?

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Q. Currently, there are two major heuristic algorithms for performing database searches: BLAST and FASTA.

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Q. Which of the following is incorrect the ‘word’ method?

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Q. The BLAST program was developed in _______

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Q. In sequence alignment by BLAST, each word from query sequence is typically _______ residues for protein sequences and _______ residues for DNA sequences.

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Q. In sequence alignment by BLAST, the second step is to search a sequence database for the occurrence of these words.

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Q. The final step involves pairwise alignment by extending from the words in both directions while counting the alignment score using the same substitution matrix.

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Q. A recent improvement in the implementation of BLAST is the ability to provide gapped alignment.

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Q. Which of the following is not a variant of BLAST?

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Q. BLASTX uses protein sequences as queries to search against a protein sequence database.

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Q. TBLASTX queries protein sequences to anucleotide sequence database with the sequences translated in all six reading frames.

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Q. Which of the following is not correct about BLAST?

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Q. If one is looking for protein homologs encoded in newly sequenced genomes, one may use TBLASTN, which translates nucleotide database sequences in all six open reading frames.

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Q. Which of the following is not correct about FASTA?

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Q. The first step in FASTA alignment id to arrange the sequences in matrices’ rows and columns in order to be analyzed.

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Q. The positional difference for each word between the two sequences is obtained by ________ the position of the ______ sequence from that of the _______ sequence and is expressed as the offset.

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