"a unique characteristic of mitochondria is that they are inherited from the female parent only. select the correct explanation for this phenomenon from the choices below"

answer; the male's sperm cells have mitochondria, but because the sperm contributes dna but no cytoplasm, no mitochondria are passed to the egg at ferilization;

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.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.