Blog of Andrés Aravena

Homework 1, Bioinformatics 2022

26 September 2022. Deadline: Friday, 30 September, 9:00. by Andrés Aravena, Ph.D.

Last class we showed how to look for specific sequences in NCBI using advanced search. This homework aim is to practice this kind of search. For each of the following questions, please describe the advanced query used to answer it, the database used, and the number of results.

For example, if the question is “all keratin proteins in Homo sapiens” corresponds to the query keratin[Protein Name] AND "homo sapiens"[Organism] in the Protein database, and results in 5 answers. Notice that the answer is different if you instead ask keratin AND "homo sapiens".

We do not want to see the all the results, only the number of results, the database name, and the query.

Please answer by email and fill the answers below each question. No Microsoft Word™ files are allowed. It is fine if you just write your answers in the email, so you do not need to attach any file.

Do not send your answers to the forum. Send them directly to


Deadline: Friday, 30 September, 9:00.

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