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'.
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Question: Question: It is characteristic of the alpha helix: 
 Options:  <1> Present 3.6 amino acid residues per turn. <2> Be levorotatory <3> Be stabilized by intrachain disulfide bridges. <4> Present ionic bonds between amino and ketone groups loaded with peptide bonds. <5> Have the side chains of the amino acids inwards.

Answer: 1


Question: Question: The following metals can be determined by complexometric or chelometric titration: 
 Options:  <1> All without exception. <2> All except transition metals. <3> All except lithium, sodium and potassium. <4> All except alkaline earth metals. <5> All except gold and silver.

Answer: 3


Question: Question: In comparison with polyclonal antibodies, a monoclonal antibody: 
 Options:  <1> It has low cost. <2> It has heterogeneous specificity. <3> It is of variable specificity. <4> Recognizes a single epitope. <5> It is of variable affinity.

Answer:
4