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ribosomes are necessary for protein synthesis
protein
Ribosome.
Ribosomes
Ribosomes are composed mainly of protein and RNA.
It provides us with protein. Our bodies break it down into simpler components called amino acids and then uses them to build its own proteins, which are used for... well, darn near everything. Muscle tissue, connective tissue, enzymes, antibodies, you name it, they're all composed of protein.
Ribosomes are composed of protein and RNA.
Fingernails and hair (and claws, hooves and horns on animals) is composed of a protein called "Keratin".
thick filaments
ribosomes are necessary for protein synthesis
protein
simple protein and non protein substance.
Ribosome.
Actually, DNA is not a protein. It's composed of nucleic acids, another group of organic molecules. It can be associated with proteins (like histones) to be coiled up, but it's actual composition is not of proteins. It provides the template for every protein made in the cell.
The thick filament is composed of the myosin molecule. The thin filament is composed of the actin molecule. Flexing the head of myosin provides the powerstroke.