what are the main purposes of the cells insides?

Answer 1

No offense but there are a lot organelles inside cells with a lot of functions. Too many to list in this forum. Try reading Essentials of Human Anatomy & Physiology by Marieb.

Answer 2

Life

The cell is the fundamental biological component of life for all life forms we know of except for viruses. Cells come in two types:

Prokaryotics: http://en.wikipedia.org/wiki/Cell_%28biology%29#Prokaryotic_cells
Eukaryotics: http://en.wikipedia.org/wiki/Cell_%28biology%29#Eukaryotic_cells

Go to those entries and look at the diagrams at the right and you will see each component of the cell labeled. If you click on the blue hypertext link then it will take you to the article that explains what the part of the cell does.

"Prokaryotes are distinguished from eukaryotes on the basis of nuclear organization, specifically their lack of a nuclear membrane. Prokaryotes also lack most of the intracellular organelles and structures that are characteristic of eukaryotic cells (an important exception is the ribosome, which are present in both prokaryotic and eukaryotic cells). Most functions of organelles, such as mitochondria, chloroplasts, and the Golgi apparatus, are taken over by the prokaryotic plasma membrane. Prokaryotic cells have three architectural regions: appendages called flagella and pili — proteins attached to the cell surface; a cell envelope consisting of a capsule, a cell wall, and a plasma membrane; and a cytoplasmic region that contains the cell genome (DNA) and ribosomes and various sorts of inclusions....

Eukaryotic cells are about 10 times the size of a typical prokaryote and can be as much as 1000 times greater in volume. The major difference between prokaryotes and eukaryotes is that eukaryotic cells contain membrane-bound compartments in which specific metabolic activities take place. Most important among these is the presence of a cell nucleus, a membrane-delineated compartment that houses the eukaryotic cell's DNA. It is this nucleus that gives the eukaryote its name, which means "true nucleus"."

Answer 3

Could you be more specific, what insides?
Organelles, cytoplasm, cytoskeletal elements?

I guess you could say they are to carry out functions needed for cell survival.

Answer 4

C. to grow many identical cells outside the body. In future use your text book.. more reliable.