Which of the following organelles found in living cells is not bound by a membrane or membranes?

Prokaryotic cells lack a nucleus and membranous organelles.

Explanation:

Prokaryotic cells have the following features: 1. The genetic material (DNA) is localized to a region called the nucleoid which has no surrounding membrane.

the answer is ribosomes

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.