Aspirin is an acid with a pKa of 3.5; its structureincludes a carboxyl group. To be absorbed into the bloodstream,it must pass through the membrane lining the stomach and thesmall intestine. Electrically neutral molecules can pass through amembrane more easily than can charged molecules. Would youexpect more aspirin to be absorbed in the stomach, where the pHof gastric juice is about 1, or in the small intestine, where the pH isabout 6? Explain your answer.
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.
Aspirin is an acid with a pKa of 3.5; its structure
includes a carboxyl group. To be absorbed into the bloodstream,
it must pass through the membrane lining the stomach and the
small intestine. Electrically neutral molecules can pass through a
membrane more easily than can charged molecules. Would you
expect more aspirin to be absorbed in the stomach, where the pH
of gastric juice is about 1, or in the small intestine, where the pH is
about 6? Explain your answer.
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