1. write a function called 'back_trans' that takes an rna sequence as an argument and returns the original dna sequence. for example, if the rna sequence is: uaguacua then the backwards transcribed dna sequence should be: tagtacta write a program to prompt the user to enter an rna sequence and validate the sequence using the function you wrote in lab 5 and display the original dna sequence. 2. write a function called 'gc_percent' that takes a dna sequence as an argument and returns the percentage of the sequence that are 'g' or 'c' nucleotides. for example, if the dna sequence is: tagtacta then the function will return 0.25. for this problem, your program must read the dna sequence from a file called "fasta. txt". the contents of the file are: > monkey 3. create a list called sequences that is initialized to the following: ['tagtacta', 'catgat', 'gattaca', 'acta', 'gag'] for each item in the list use a function to transcribe it to rna.