Which is composed of amino acids and determines all the structures and functions of organisms?
a: dna
b: ribosome
c: mrna
d: protein

this describes proteins

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.