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.

Question: In the processing and presentation of peptides of extracellular origin intervene (n): 
 Options:  <0> The TAP proteins. <1> The tapasina. <2> The HLA-DM molecule. <3> The proteosome. <4> The HLA-B molecules.
biology

Question: Transpeptidation is the step in the biosynthesis of peptidoglycan in which: 
 Options:  <0> The union of N-acetylmuramic acid with N-acetyl glucosamine occurs inside the bacterial cell. <1> The exit of the precursors from the cytoplasm to the outside takes place. <2> The binding of the precursor to the peptidoglycan occurs outside, by glycosidic bonds. <3> The binding, by means of interpeptide bridges, between peptidoglycan chains. <4> The autolisinas act forming pores in its structure.
pharmacology

Question: Which of the following metabolites is a gluconeogenic substrate: 
 Options:  <0> Ethanol. <1> Oleic acid. <2> Acetyl-CoA. <3> NADPH + H +. <4> Glycerol.

pharmacology

