Learn Turkish: Sorumluluk almak istemiyor musun? - Do you not want to take responsibility?

It comes from the root sor- (to ask or hold accountable). Adding a suffix gives us sorumlu (responsible), and finally the abstract noun suffix -luk makes it sorumluluk (responsibility).

Why is it istemiyor instead of istemeyor?

This happens because of a rule called vowel narrowing. When the present continuous suffix -yor is added to a word ending in -e or -a, that wide vowel narrows. Here, the negative suffix -me narrows to -mi.

Why doesn't almak take any personal suffixes here?

When you say you "want to do" an action in Turkish, the action verb takes the standard infinitive form (-mak or -mek) and sits right before the conjugated form of istemek (to want).

How does the negative question structure work in istemiyor musun?

First, the negative suffix -me (narrowed to -mi) and the continuous tense -yor are attached to the verb stem to make istemiyor (does not want). Then, the question particle mu and the "you" ending -sun form a separate word, musun, to turn it into a question.