핵

핵(nucleus)

세포의 핵을 의미하며, 세균과 남조류를 제외한 대부분의 세포에 존재한다.
핵 주위는 핵막으로 둘러싸여 있으며, 핵막은 핵공(구멍)을 가지는 2중막 구조로 되어있다.
핵의 모양은 구형과 타원형이 보통이며 물리적 조건에 따라서 다른 형태를 가지기도 한다.
핵 속에는 Nucleotide가 존재하며 DNA로 부터 세포질 속으로 mRNA를 내보내어 단백질을 합성할수 있도록 해준다. 
http://biocc.ngic.re.kr/Biopedia/Biowiki/images/c/cd/%ED%95%B5.jpg

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