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'.

Question: The thromboxanes:
Options: <1> They induce platelet aggregation. <2> They inhibit platelet aggregation. <3> They act as bronchodilators in the respiratory system. <4> They are produced in the membranes of all cells. <5> They are derived from saturated fatty acids.
1

Question: A key reaction in the regulation of gene expression is acetylation / desatethylation in the histones of some of its residues:
Options: <1> Serina <2> Threonine <3> Lysine <4> Tryptophan <5> To the girl.
3

Question: Affinity chromatography is characterized because:
Options: <1> It is a modality of gas chromatography. <2> It is similar to paper chromatography. <3> It is a separation process based on the very selective or specific interactions that exist between biological macromolecules. <4> It is a technique of separating compounds according to their molecular weight. <5> It is a variant of chromatography that employ relatively non-polar stationary phases and more polar solvents, in contrast to normal phase chromatography.
3