Exercise 2.3.1

Note: This exercise won’t work yet due - install BioPython!

Retrieve a FASTA file named data/sample.fa using BioPython and answer the following questions:

• How many sequences are in the file?
• What are the IDs and the lengths of the longest and the shortest sequences?
• Select sequences longer than 500bp. What is the average length of these sequences?
• Calculate and print the percentage of GC in each of the sequences.
• Write the newly created sequences into a FASTA file named long_sequences.fa.