In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Q: Question: A conjugated protein is: 
 Options:  <0> A protein that contains chemical components different from the permanently associated amino acids. <1> A protein that contains amino acids with side chains with conjugated bonds. <2> A protein that contains chemical components that make it insoluble. <3> A protein incorrectly folded. <4> A denatured and inactivated protein.

A: chemistry
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Q: Question: A microelectrode is characterized by: 
 Options:  <0> Give answers in steady state. <1> Always need an inert electrolyte. <2> Always need a potentiostatic system. <3> Do not need a reference electrode. <4> Always need agitation.

A: chemistry
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Q: Question: On the link between the nitrogenous base and the ribose of the nucleotides: 
 Options:  <0> The anomeric carbon of ribose is in alpha configuration. <1> It is an N-glycosidic bond. <2> It involves the C5' of the ribose. <3> It involves phosphate groups. <4> It is of a different nature for each nitrogenous base.

A:
biology
****