1. You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. (a) A carbohydrate solution gave a negative Benedict's, Barfoed's, Bial's, and a positive Seliwanoff's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed positive Benedict's, Barfoed's, and Seliwanoff's tests and a negative Bial's test. What carbohydrate was in the original solution? (b) A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? (c) Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?
Nucleotides
It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleic Acids
Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
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