GENERAL HISTOLOGY

Detailed explanation-1: -Ribosomes are found in prokaryotic and eukaryotic cells; in mitochondria, chloroplasts and bacteria. Those found in prokaryotes are generally smaller than those in eukaryotes.

Detailed explanation-2: -All living cells contain ribosomes, tiny organelles composed of approximately 60 percent ribosomal RNA (rRNA) and 40 percent protein. However, though they are generally described as organelles, it is important to note that ribosomes are not bound by a membrane and are much smaller than other organelles.

Detailed explanation-3: -Prokaryotic cells only have a small range of organelles, generally only a plasma membrane and ribosomes.

Detailed explanation-4: -A mammalian cell may harbor as many as 10 million ribosomes, and it can devote up to 60% of its energy to constructing them from RNA and 80 different types of proteins.