Acell needs nutrients for its survival. complex nutrient molecules, such as sugars and proteins, are taken into the cell and broken down into simple, usable molecules by cellular enzymes. these simple molecules provide the required energy to the cell for its survival. which organelles are most responsible for taking in and breaking down the nutrients for the cell? a. nucleus and chloroplast b. cell membrane and lysosome c. mitochondria and cell membrane d. lysosome and nucleus