Answer: The part of the cell that makes food depends on the type of cell. If it is a plant cell, the chloroplasts make the food using the process of photosynthesis. If it is an animal cell, they can not make their own food so they take food that the animal has eaten and the energy for the cell is produced in a structure in the cell called the mitochondria.
Answer: axons conducts electrical impulses away from the neuronal cell body. dendrites are branched neuronal projections that conduct the electrical stimulation received from other neurons to the cell body from which they branch.
Answer: The barrier between the external environment and the inside of the cell is the cellular membrane, or just cell membrane. A cell wall is also present in plant cells, but substances can still enter through the cell wall. Harmful substances are stopped only when reaching the cell membrane. Some unicellular bacteria (or viruses) form an external layer outside the cell membrane, known as an envelope.