請問蛋白質protein名詞 可數嗎?

Yes, it may be countable when used to address different types of proteins.

Abstract noun is name of a quality or state in goodness, virtue eg:-protein.
The protein is body-building substance essential to good health, in such foods as milk, eggs, meat, protein etc; hence uncountable.

｛protein｝一般是不可數的, 當寫成proteins 是指體系裡的不同的蛋白質。