【单选题】Nucleotides are the building blocks of the DNA molecule. A nucleotide consists of _____.
A.
a double stranded molecule
B.
four nitrogenous bases
C.
a nitrogenous base, a phosphate group and a sugar molecule
【判断题】Nucleotides are the monomer units of nucleic acids.
【单选题】氧化三甲胺极不稳定,容易还原成具有腥味的 。
【简答题】大青叶的原植物属于( )A.豆科 B.十字花科 C.蓼科 D.蔷薇科A. 1 B. 1 C. 1 D. 1