But maybe you can explain archaea, and eukaryotes, Alice.

也许你应该解释一下古生菌和真核生物。

They are the closest relatives to eukaryotes, according to recent DNA analyses.

根据最近的DNA分析，它是与真核生物最接近的亲属。

Prokaryotes didn't gradually morph into eukaryotes through a bunch of gradual evolutionary steps.

原核生物不是通过一系列渐进的进化步骤逐渐变成真核生物的。

Such modern intermediates might have been the end product for primeval eukaryotes.

这些现代中间体可能是原始真核生物的终产品。

Roughly one billion years later, prokaryotes evolved into more complicated eukaryotes.

约 10 亿后，原核生物进化成更复杂的真核生物。

We have isolated around 30 or 40 strains already of unicellular eukaryotes.

Malavin：我已经分约 30 或 40 株单细胞真核生物。

Another  billion years passed before eukaryotes developed into multicellular organisms, which eventually  exploded into diverse kingdoms of complex life.

又过了 10 亿，真核生物才发展成为多细胞生物，最终发展成复杂生命的不同王国。

For that reason, palaeontologists have used the compounds as a biomarker for the presence of eukaryotes in ancient rocks.

因此，古生物学家使用这些化合物作为古岩石中真核生物存在的生物标志物。

He said that while fungi are one of the more diverse groups of eukaryotes today, their ancient fossil record is " very scarce" .

他说，虽然真菌是当今最多样化的真核生物群体之一，但关于它的古老化石记录" 非常稀少" 。

The molecules are 1.6 billion years old and hint that eukaryotes were abundant and widespread much longer ago than earlier biochemical evidence had suggested.

这些分子有16亿的历史，暗示着早在之前的生物化学证据所显示的时间之前，真核生物就已经广泛存在和繁殖了。

This absence has led to speculation that before 800 million years ago, eukaryotes were not abundant enough to leave a detectable sterol trace.

这种缺乏导致了一种猜测，即在8亿前之前，真核生物并不足以留下可检测到的类固醇痕迹。

This year, microbiologists took a major step toward understanding the origin of eukaryotes, the group that includes plants, animals, and other organisms with cell nuclei.

今，微生物学家在理解真核生物的起源方面迈了一步，真核生物是包括植物、动物和其他有细胞核的生物的群体。

Most modern eukaryotes rely on fat-like compounds called sterols, such as cholesterol, to build cell membranes and carry out other cellular functions.

多数现代真核生物依靠类似脂肪的固醇类化合物（如胆固醇）来构建细胞膜并执行其他细胞功能。

And that included humans as well as plants and many other complicated eukaryotes.

这包括类以及植物和许多其他复杂的真核生物。

Eukaryote is the scientific term for organisms with a much larger and more complex type of cell– and this group includes all animals, plants, and fungi.

真核生物是指具有更更复杂细胞的生物体，真核生物包括所有的动物、植物和真菌。

One possibility is that eukaryotes that make more-modern sterols gained a selective advantage between one billion and 800 million years ago, eventually displacing their protosterol-making counterparts.

可能的一种可能性是，在10亿到8亿前，制造现代固醇的真核生物获得了选择性优势，最终取代了它制造原始固醇的同类。

In eukaryotes, if the introduced genes are derived from another organism, the resulting transgenic plants or animals can be propagated by normal breeding.

转基因羊已经被生产了来，可以通过它的奶生产有价值的蛋白。目的基因需要羊的启动子（酪蛋白或乳清蛋白）以确保在乳腺中表达。从奶中纯化蛋白要比从培养的细胞中纯化蛋白要容易的多。

Animals are multicellular eukaryotes – complicated lifeforms, that consume organic material, breathe oxygen and live now as the varied and complex creatures we see all around us.

动物是多细胞真核生物，这些复杂的生命形式，以有机物为食物，呼吸氧气，并以我所见的形式多样且复杂的生物而存在。

Problem is, it’s hard to know when that first eukaryote popped up on Earth, since it’s so tough to find and identify the oldest fossils.

问题是，很难知道第一个真核生物是什么时候现在地球上的， 因为要找到和鉴定最古老的化石非常困难。

Because sterols are found throughout the eukaryotic family tree, they are thought to have been present in the last common ancestor of all modern eukaryotes.

由于类固醇在真核生物系谱中随处可见，因此认为它存在于所有现代真核生物的最后一个共同祖先中。