Jacqueline isolated an interesting new protein from the broth of a yeast culture. After purification of the protein, she requested an amino acid analysis and found that the protein contained 0.48 % tryptophan by weight (tryptophan Mr=204).

a. Calculate the minimum molecular weight of the protein (i. e., assuming there is only one tryptophan residue per protein molecule).
b. Size-exclusion chromatography of the protein gave a molecular weight estimate of 53500. How many tryptophan residues are present in a molecule of the new protein?

a)minimum molecular weight of the protein= 42500g

b) new protein contains 262.25 molecules of tryptophan

Explanation:

a) if 0.48 % by weight of tryptophan has the molecular weight=204g

It implies that the molecular weight of the 100% protein will be 100×204/0.48=42500g of protein as the minimum molecular weight of the protein

b) new protein Molecular weight= 53500

1-molecule of tryptophan has Mm = 204,

Hence 53500/204= 262.25 molecules of tryptophan in the new protein

right

explanation:

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.