Protein phosphorylation is a reversible post-translational modification of proteins. In eukaryotes, protein phosphorylation functions in cell signaling, gene expression, and differentiation. It is also involved in DNA replication during the cell cycle, and the mechanisms that cope with stress-induced replication blocks.
Cake Doughnut. A single glazed chocolate cake doughnut that is around 3 3/4 inches in diameter can have close to 250 calories. Depending on the recipe, some varieties -- like chocolate-frosted chocolate cake doughnuts -- can have as many as 370 calories.
A Boston cream doughnut contains approximately 400 calories and 16 grams of fat. Over half of the fat in the Boston creme doughnut is from saturated fat. Apple fritters are among the unhealthiest doughnuts. Just because a doughnut has fruit it it doesn't mean it is a good choice.