Question

perform the following using Ruby language

A DNA strand is represented by a string of the characters A, C, G, and T, each of which represents a nucleotide. Each nucleotide has its complement as indicated by this Ruby hash:

NUCLEOTIDE_COMPLEMENT = {
     'A' => 'T', 'T' => 'A', 'C' => 'G', 'G' => 'C'

}

The reverse-complement of a DNA string is a new string in which each nucleotide is replaced by its complement and the string is reversed. Reverse-complements are important in bioinformatics since a strand of DNA can be read in forward direction or, equivalently, its complementary strand can be read in its forward direction, which is reverse of the original string’s direction. Add the reverse_complement method to your DNA class. In response to reverse_complement, it returns a new DNA instance representing its reverse-complement. Note also that a == b if and only if DNA instances a and b represent the same DNA strand.

Output:

puts dna1 = DNA.new('ATTGCC')
#ATTGCC

puts dna2 = dna1.reverse_complement
#GGCAAT

puts dna2
#GGCAAT

puts dna1

#ATTGCC

puts dna2.reverse_complement
#ATTGCC

puts dna1.reverse_complement.reverse_complement == dna1

#true

Answer 1

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CODE:

#!/usr/bin/ruby
class DNA_strand
    def initialize(seq)
        @sequence = seq
    end
        
    def reverse_complement
        rC = ''
        @sequence.split('').each do |i|
            if i == 'A' 
                rC += 'T'
            else if i == 'C' 
                rC += 'G'
            else if i == 'G' 
                rC += 'C'
            else
                rC += 'A'            
            end
        end
        return rC
    end
end    

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