Answer
A. Organelles
Explanation
Organelles are specialized structures within the cell that are enclosed by a membrane and carry out distinct functions. These functions are vital to the survival of the cell and the overall health of the organism.
Ribosomes are one type of organelle responsible for protein synthesis within the cell. They read the genetic code stored in the DNA of the cell's nucleus and use it to build proteins. The nucleus itself is another important organelle that stores and replicates the genetic material of the cell.
Lysosomes are another type of organelle that function to break down and recycle worn-out organelles and other cellular debris. They contain digestive enzymes that break down these materials so that their components can be reused by the cell.
The number and concentration of organelles within a cell can vary depending on the specific function and location of the cell. For example, muscle cells require a lot of energy to contract and relax, so they have a high concentration of mitochondria, which produce energy in the form of ATP. Similarly, cells that produce and secrete hormones have a large number of Golgi apparatus, which help package and transport proteins for secretion.
