nuclease - general term for enzymes that catalyze the hydrolysis of nucleic acid by cleaving chains of nucleotides into smaller units. 1  endonuclease - a nuclease that cleaves nucleic acids at interior bonds and so produces fragments of various sizes. exonuclease - a nuclease that releases one nucleotide at a time (serially) beginning at one of a nucleic acid. enzyme - any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions.
1 gram of fat = 9 calories. Each gram of fat contains 9 calories. In general carbs are 4 cal per gram, as is protein and fat is 9 cal per gram. 16 people found this useful.
Calories in food come from carbohydrates, proteins and fats. Carbohydrates contain 4 calories per gram, the same as proteins. Fats contain 9 calories per gram. Although calories from carbohydrates are all the same, their nutritional values aren't. Find the nutritional index on the food packaging. The index lists the number of carbohydrate grams per serving.