Question
a.
The last column contains the sequences themselves
b.
It is quite tough making an index of the information in each of these fields so that a search query can locate all the occurrences through the index
c.
If one imagines a large table with each sequence entry occupying one row, then each column will include one of the above types of information for each sequence, and each column is called a FIELD
d.
The DNA, protein, and reference databases have all been cross-referenced so that moving between them is readily accomplished
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