关于抑癌基因的正确叙述是
A.其产物具有抑制细胞增殖的能力
B.与癌基因的表达无关
C.肿瘤细胞出现时才表达
D.不存在于人类正常细胞
E.缺失与细胞的增殖和分化有关的因子
参考答案:A
中国公证协会的性质是
A.党政机关
B.人民团体
C.企业法人
D.社会团体法人
Ideally, anatomical investigation consists of a combination of descriptive and experimental approaches. Present-day anatomy involves scrutiny of the structure of organ-isms at many levels of observation.()
A. analysis
B. recognition
C. evaluation
D. examination