Astudent is given five samples and told they are lysine (an amino acid), lactose (a disaccharide), insulin (a protein hormone), rna and fat. the samples are in test tubes marked 1-5, but the student doesn’t know which compound is in which tube. the student is instructed to identify the contents of each tube. in her first test, she tries to hydrolyze a portion of the contents of each tube. hydrolysis occurs in all tubes except tube 5. in the next test, she finds that tubes 3, 4, and 5 are positive for nitrogen but only tube 3 gives a positive result for the presence of sulfur. in the next test the student shows that the compound in tube 4 contains a high percentage of phosphate. in the final test the student shows that compound 1 is hydrophobic. base on these data, identify what is in each tube.

The Content in the tubes is:

tube 1: Fat

tube 2: Lactose

tube 3: Insulin

tube 4: RNA

tube 5: Lysine

Explanation:

tube 1: Fat is always not compatible with water it means hydrophobic

tube 2: For rejection of the other tubes the last molecule to assigned a tube is lactose due to we do not have a specific test information for tube 2

tube 3: The insulin has a two disulfide bonds and is the only molecule with sulphur atoms.

tube 4: The nitrogen based compounds that belongs to the RNA are binded with phosphate groups all around its chain, so the presence of phosphate indicates that is RNA.

tube 5: Because was the only one who does not hydrolyse it is an aminoacid.  

finally it says that in the tubes 3, 4 and 5 has nitrogen, the only 3 compound with nitrogen are Lysine, insulin and RNA.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: