関連ワード:  what is a ribosome in a animal cell    what is a nucleus in a animal cell    what is a cytoplasm in a animal cell    what is a mitochondria in a animal cell    what is a nucleolus in a animal cell    what is a endoplasmic reticulum in a animal cell    what is a smooth er in a animal cell    what is a nuclear membrane in a animal cell    what is a lysosomes in a animal cell    what is a rough er in a animal cell