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 denaturing of DNA:
Options: <1> It increases when the temperature decreases. <2> It is accompanied by an increase in the absorption of UV light. <3> DNA with high G / C content does so at a lower temperature than those rich in A / T. <4> It is irreversible. <5> Indicates the hydrolysis of phosphodiester bonds.
2

Question: The simultaneous expression of IgM and IgD is observed for the first time in lymphocytes:
Options: <1> Early Pro-B. <2> B mature. <3> Late Pro-B. <4> Pre-B. <5> B immature
2

Question: In relation to the structure of the genomes, the introns:
Options: <1> They frequently occur in prokaryotic genomes. <2> There may be several in the same gene. <3> They encode rare amino acids in proteins. <4> They are transcribed and translated. <5> They have a high content in G: C pairs.
2