finish this code to produce a reversed complementary DNA sequence: dna = ATGCATGATTACA' complement = for i in range(len(ana)): if dna[i] == 'A': complement elif dna[1] == 'T': complement + T' how to count the number of nucleotides in this for loop, so I can compute an estimate of the DNA melting temperature (replace all ??? with the correct code): segs = ['ATTTAACAG', 'CGACAGAT', 'AACGAT'] for seg in seqs: nA = ??? nI = ??? nC = ??? nG = ??? tm = 2 * (nA + print(seq. tm) nI) + 4 * (nC + ng) How do I construct a for loop to iterate over all codons so I can properly perform translation? (Assume that "codon_table" has already been defined as a dictionary. Replace all ??? with the correct code.) dna 'ATGGAACCATGA' protein = for i in ???: codon = ??? protein = protein + codon_table[codon]