Plant Biology and Photosynthesis Flashcards questions correct answers verified 100% Q5 Name two organelles that are present in all plant cells, but not in all animal cells. A chloroplasts and vacuoles Chloroplasts aid in photosynthesis and are actually never present in animal cells. Vacuoles are large structures used for the storage of waste, nutrients, or water. Some animal cells do have vacuoles, but they are much smaller than the vacuoles found in plant cells. 6 Q What structure, which human cells lack, surrounds the outer face of the plasma membrane in plant cells? A cell wallPlants have cell walls made of cellulose (a carbohydrate), fungi have cell walls composed of chitin, and bacteria have cell walls that consist of peptidoglycan. Humans do not have cell walls; our cells are surrounded by the plasma membrane alone. 7 Q In the net reaction of photosynthesis, which molecules are reactants and which molecules are products? A Reactants: Carbon dioxide Water Products: Glucose Oxygen The purpose of photosynthesis is to make glucose (a carbohydrate food source) to fuel the plants cells. Technically, light is also a reactant, but light is not a molecule. 8 Q What is the net reaction of photosynthesis? A6 CO2