nucleotides - monomers of nucleic acids, double helix - structure of DNA, amino acids - monomers of proteins, keratin - fibrous structural protein of hair, nails, horn, etc., ribonucleic acid - a long, single-stranded chain of cells that processes protein,

Introduction

由
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？