[名词解释] denovo synthesis of purine nucleotide
[名词解释] 核苷酸（nucleotide）
[名词解释] Allosteric regulation
[名词解释] 环化核苷酸(cyclic nucleotide)
[单选题]If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A . high steam pressure in the boilerB . abnormally high feed water temperatureC . abnormally high boiler water temperatureD . steam demand exc
[单选题]英文Radial Feed表示（）.A . 反馈B . 进给速度C . 旋转运动D . 径向进给
[名词解释] 神经调节（nervous regulation）
[名词解释] 体液调节（humoral regulation）
[名词解释] 自身调节（auto regulation）
[名词解释] 密度调节（regulation of density）