1. Use the nucleotide sequence to select correct responses. There are three correct responses. 5' AUC CCC CUG AUG GGU GAU AUA AAA UAG AGA GGU 3' This is a RNA sequence. There are 11 codons and 23 nucleotides. Taking start and stop codons into consideration, this sequence would code for 5 amino acids. The stop codon in this sequence is UAA. The first three codons in the complementary sequence of the strand given are 5 ' ACC UCU CUA ......3' If a deletion mutation occurred in the second codon during the synthesis of this sequence the new sequence would still code for the same number of amino acids. A. This is a RNA sequence. There are 11 codons and 23 B. nucleotides. Taking start and stop codons into consideration, this C. sequence would code for 5 amino acids. The stop codon in this D. sequence is UAA. The first three codons in the complementary sequence of E. the strand given are 5 ' ACC UCU CUA ......3' If a deletion mutation occurred in the second codon during the synthesis of this sequence the F. new sequence would still code for the same number of amino acids..

1. (1) [6 points] Which one of the two terms, flavor or buck, is more informative about review #4 in the
review corpus? Justify your answer by calculating their TF-IDF scores.
Note: The TF-IDF scores should be calculated after word-stemming and removing stopwords and
non-words. Assume that stopwords = c(is, and, the, of) and word-stemming replaces nouns in
their plural form with their singular form. Please specify your own list of non-words.
(2) [2 points] In this analysis, should we pre-process the review data by removing numbers from
the text? Why or why not? Please explain.