Yes, protein is countable. It can be measured in grams or other units to determine the amount of protein present in a food or drink.
The noun DNA (or deoxyribonucleic acid) is an uncountable noun, a word for a substance.
"Incarnation" is a singular, common, countable noun.
No, "cell" can be both a countable and uncountable noun. It is countable when referring to individual units like a prison cell or biological cell. It is uncountable when referring to a general concept or substance, such as a battery cell or cell growth.
The protein that can be phosphorylated by protein kinase AA is called protein X.
protein !
countable
countable
The noun 'hill' is a countable noun. The plural form is 'hills'.
cookies are countable unless you have brain problems
countable
Shark is a countable noun.
Duck as an animal is countable, but if you mean the meat it is uncountable.
Prawn - prawns is the plural - is a countable noun
few is countable
countable
Countable
The word hair can be both a countable noun and a non countable noun, depending on how it is used. For example in the sentence "Mary has long blonde hair", it is non countable. In the sentence "Dad is getting a few gray hairs" it is countable.