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: The lithium dialkyl-heptarate reacts with alkyl halides to produce, by formation of carbon-carbon bonds between the alkyl group of the halide and the alkyl group of the dialkyl acetate: 
 Options:  <0> Alcanes. <1> Alquenos <2> Alquinos. <3> Aromatics <4> Piranos.
chemistry

Question: Which of the following situations would noticeably decrease the transcription of a gene? 
 Options:  <0> The presence of a repressor and an inducing molecule. <1> The binding of RNA polymerase to DNA. <2> The presence of a repressor and a correpressor molecule. <3> The presence of an activator and its signal molecule. <4> The presence of a mutated repressor that could not bind to DNA.
pharmacology

Question: It is UV visible molecular absorption spectroscopy is called isosbestic point a: 
 Options:  <0> The region of the spectrum where two species have the same radiation emission capacity. <1> The pH at which two absorbing species have the same molecular absorption coefficient. <2> The temperature at which two absorbing species in equilibrium stop emitting radiation. <3> The wavelength at which two absorbing species in equilibrium has the same refractive index. <4> The wavelength at which the molecular absorption coefficients of two absorbent species in equilibrium, interconvertible to each other, are equivalent.

chemistry