What drove the transition from such membranes to modern ones , which are based on the more complex phospholipids ?

这种的简单膜结构转变成现代的基于磷脂的版本是由什么驱使的？

Alternatively , another darwinian tableau might see the random development of ribozymes able to add phospholipids , the stuff of modern membranes , to outer fatty acid membranes .

或者，按照达尔文主义会出现另一种情形：随机发展的核酶会将现代生物膜中才有的磷脂加入到外层脂肪酸膜中。

A primitive rna might have catalysed the synthesis of phospholipids , but what advantage would phospholipids have conferred on primordial cells ?

一种原始的rna可能催化了磷脂的合成，但是磷脂又授予了原生细胞什么优势呢？

Like phospholipids , these simpler fatty acids form double-layered protocell walls that keep large molecules in . But unlike phospholipids , they allow nucleotides , the small building blocks of genetic material , to pass through .

与磷脂相似的是，这些普通脂肪酸形成古细胞的双层膜，包住大分子；而与磷脂不同的是，这些脂肪酸允许遗传物质的小元件核苷酸穿过。