In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

[EX Q]: Question: In general, allosteric enzymes:
Options: <1> They link the effectors in the active center. <2> They form covalent bonds with their negative effectors. <3> They originate hyperbolic curves of speed before the concentration of substrate. <4> They change their conformation when they link effectors. <5> They are irreversibly modified when they are inhibited.
[EX A]: 4

[EX Q]: Question: What group of amino acids, when they are part of the proteins, can be phosphorylated?
Options: <1> Val, Ser, Thr. <2> Phe, Ala, Gly. <3> Val, Glu, Asp. <4> Tyr, Ser, Thr. <5> Lys, Ser, Ile.
[EX A]: 4

[EX Q]: Question: It is a genus of strict anaerobic bacteria that produce endospores and that contain pathogenic species:
Options: <1> Bacteroides. <2> Bacillus. <3> Clostridium <4> Corynebacterium <5> Mycobacterium
[EX A]:
3