Question

x-12 def f1(a, b-x): print (a, b) x-15 f1(4) a) Error b) 12 4 c) 4 12 d) 4 15 Part 2: Show how this function is called b. Write a program that reads in a file called DNAseq.txt where each line contains a sequence. Call the above function for each sequence and then write the returned complement sequence to a file called DNAcomp.txt.

Answer 1

1.

r5 p1 xd 12345678

In [37]: runfile( 'C:/Users/ Administrator/Desktop/untitledl.py, wdir-'C:/Users/Administrator/Desktop') 4 12 In [38]:|

Output is: 4 12

As the first argument is passed and which is 4, and the second argument is not passed but it is assigned to x in the function itself, so it takes the value of x and prints it.

Hence we get the following output.

Option C is correct.

2.

PART A:

#function to find the complement of the DNA sequence
def dna_complement(seq):
    output = ''
    
    #loop will go through each alphabet in sequence and convert them accordingly and add to the output string
    for letter in seq:
        letter = letter.upper()

        if letter == 'A':
            output += 'T'
            
        elif letter == 'T':
            output += 'A'
            
        elif letter == 'G':
            output += 'C'
            
        elif letter == 'C':
            output += 'G'
        
        else:
            output += ''
    
    #returning the complemented sequence
    return output

#taking user input for DNA sequence
dna_seq = input('Enter a DNA sequence: ')

#calling the funcion and storing the result 
complement = dna_complement(dna_seq)

#displaying the result
print('\nComplemented sequence is: ',complement)

1#function to find the complement of the DNA sequence 2 def dna_complement(seq) 3 output - 5 6 #loop will go through each alphabet in sequence and convert them accordingly and a for letter in seq: letter letter.upper() if letterA' elif letter 'T' elif letter G' elif letter 9 10 12 13 14 15 16 17 18 19 output +T output +A output +C output +G 21 else: output +'' 23 24 #returning the complemented sequence 25 return output 26 27#taking user input for DNA sequence 28 Hna seq-input('Enter a DNA sequence: ') 29 30#calling the funcion and stor the result 31 complement dna_complement (dna seg 32 33#displaying the result 34 print( InComplemented sequence is: ,complementl)

In [15]: runfile( C:/Users/Administrator/Desktop/untitledl.py', wdir C:/Users/ Administrator/Desktop) Enter a DNA sequence: atata Complemented sequence is: TATAT In [16]: runfile( C:/Users/Administrator/Desktop/untitled1.py, wdir-'C:/Users/ Administrator/Desktop') Enter a DNA sequence: TGCGATA Complemented sequence is: ACGCTAT In [17]:

PART B:

#function to find the complement of the DNA sequence
def dna_complement(seq):
    output = ''
    
    #loop will go through each alphabet in sequence and convert them accordingly and add to the output string
    for letter in seq:
        letter = letter.upper()

        if letter == 'A':
            output += 'T'
            
        elif letter == 'T':
            output += 'A'
            
        elif letter == 'G':
            output += 'C'
            
        elif letter == 'C':
            output += 'G'
        
        else:
            output += ''
    
    #returning the complemented sequence
    return output

#opening the file to read from
f = open("DNAseq.txt", "r")

#opening the file to write in
f_1 = open("DNAcomp.txt", "w")

#reading the lines from the file of DNAseq and the calling the function to find the complement and then writing to the file DNAcomp
for x in f:
    comp_seq = dna_complement(str(x))
    f_1.write(comp_seq)
    f_1.write('\n')

#closing both files
f.close()
f_1.close()

2 def dna_complement(seq) output- 4 5 6 #loop will go through each alphabet in sequence and convert them accordingly and a for letter in seq: letter letter, upper() if letterA' 10 outputT elif letter 'T': output +A 12 13 14 15 16 17 18 19 20 21 elif letter G' output +- elif letter C': output +G else: output +- 23 24 #returning the complemented sequence 25 26 27#opening the file to read from 28 f-open("DNAseq.txt", "r") 29 3Θ#opening the file to write in 31 f1-open ("DNAcomp.txt", "W) 32 33#reading the lines from the file of DNAseq and the calling the function to find the con 34 for x in f: 35 comp seg=dna complement ( ℃, (x)) 36 37 38 39#closing both files 4Θ f.close() 41 . close() return output write(comp_seq) write( In

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Thank You.