What type of noun cannot be perceived by the senses?

Abstract noun

The type of noun that cannot be perceived by the senses is abstract noun.

Abstract nouns are nouns that cannot be perceived with the five senses. Abstract noun describes things that cannot be touched, seen, heard, tasted, or smell. Abstract noun include feelings, ideas, concepts, aspect, and qualities. Common examples of abstract noun include anger, bravery, calm, peace, love, trust, and progress.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."