Describe the function of each organelle.
cytoplasm
chloroplasts
cell wall
centrioles

Cytoplasm: Is a semi- fluid substance. It is present between the cell membrane and the nucleus. Water is the main component of the cytoplasm. Cytoplasm dissolve in it the molecules released by organelles present in it. It acts as a reservoir for dissolution of molecules not required instantly by the cell to conduct any metabolic activity except lipids. It can dissolve proteins, glucose etc.  Pathways like glycolysis takes place in cytoplasm.

Chloroplasts: It is a cell organelle found in plants. The function of chloroplast is to carry out photosynthesis in plants. It uses pigment which traps the sunlight. It converts the sunlight energy into chemical energy in the form of ATP and NADPH.

Cell wall: It is the semi- permeable layer outside the plant, fungi, algae and bacteria. It's main function is to provide structural support to the cell. It facilitates the import and outport of molecules in and of the cell necessary for cell function.

Centrioles: They are the cell organelles which are visible during the cell division.The centrioles are the sites where the spindle fibers originate. These spindle fibers gets attach with the each membrane of the chromosome pair and facilitate their separation during cell division.  

Cell organelles are defined as the minute structures that perform specific functions inside the cell. The chloroplasts, cytoplasm, cell wall, and centrioles are cell organelles performing various functions inside the cell.

Cell organelles are the specialized structures that perform a certain function for the survival of the cell. The functions of some of the cell organelles are:

Therefore, chloroplasts, cell walls, centrioles, and cytoplasm are the cell organelles that perform various functions, such as protection, integrity, transportation, and photosynthesis.

To know more about cell organelles, refer to the following link:

link

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

that is wrong, its not thymus.