细胞核(nucleus)是真核细胞内最大、最重要的细胞结构,是细胞遗传与代谢的调控中心,是真核细胞区别于原核细胞最显著的标志之一(极少数真核细胞无细胞核,如哺乳动物的成熟的红细胞,高等植物成熟的筛管细胞等)。(初中老教材、高中教材或一些国外教材认为细胞核不是细胞器,大学细胞生物学则认为是细胞器,这里以大学教材为准),它主要由核膜(nuclear membrane)、染色质(chromatin)、核仁(nucleolus)、核基质(nuclear matrix) 等组成。
细胞核已经从卵细胞中移除。
哺乳动物中的红细胞成熟时是无核的,这意味着它们缺乏细胞核。
Erythrocytes in mammals are anucleate when mature, meaning that they lack a cell nucleus.
它很容易提取,因为它是在细胞核之外、叫做线粒体的结构里被发现的少量基因之一。
It is easily extracted, because it is one of a handful of genes found outside the cell nucleus, in structures called mitochondria.
One of the most obvious things about a red blood cell is it doesn't have nucleus, it has no nucleus.
红细胞最为明显的不同就是,它是无核的,它没有细胞核
Many steroid hormones act because they bind to cellulars - to receptors that are deep within the cell, often inside the nucleus.
许多类固醇激素能够起效是因为,其与存在于细胞内部的受体相结合,这类受体通常在细胞核内
If we think of the size of a typical atom, we would say that would be about 10 to the negative 10 meters. So, we can see the diameter of a nucleus is absolutely smaller really concentrating that mass into a very small space.
一个普通细胞的大小,抱歉,我和细胞核搞混了0,如果我们考虑,一个普通原子的大小,这大概是10的负十次方米,所以原子核的直径确实非常小,真的是把质量。
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