For the 10-residue DNA sequence example, there are _______ possible starting sites for a 20-residue-long site.(a) 30(b) 21(c) 81(d) 60This question was addressed to me by my college director while I was bunking the class.Origin of the question is Statistical Methods for Aiding Alignment topic in section Multiple Sequence Alignment of Bioinformatics

For the 10-residue DNA sequence example, there are _______ possible st

1.	For the 10-residue DNA sequence example, there are _______ possible starting sites for a 20-residue-long site.(a) 30(b) 21(c) 81(d) 60This question was addressed to me by my college director while I was bunking the class.Origin of the question is Statistical Methods for Aiding Alignment topic in section Multiple Sequence Alignment of Bioinformatics
Answer» Correct option is (c) 81 Explanation: For the 10-residue DNA SEQUENCE EXAMPLE, there are 100 – 20 +1 possible starting sites for a 20-residue-long site. Where the first one is at POSITION 1 in the sequence ENDING one at 20 and the last beginning at position 81 and ending at 100 (there is not enough sequence for a 20-residue-long site beyond position 81).

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