What is DNA?答案:The DNA is a kind of nucleic acid.(DNA是一种核酸) Where is DNA?答案:In the Chromosomes.(在染色体里) What are the chromosomes made of?答案:DNA and protein.(DNA和蛋白质) What makes up DNA?Several genes.(多个基因) What do Chromosomes look like?答案:helical ladder(螺旋状的梯子)