最早发现细胞的遗传物质DNA分子为双螺旋结构的学者是（）
A. Schleiden
B. and Schwann
C. B．R．Hook and A．Leeuwenhook
D. C．Watson
E. and Crick
F. D．R．Ｂrown
G. E．C．Darwin
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Which of the following group is not the common feature of both prokaryotic cell and eukaryotic cell（）
A. Cell membrane
B. Cytoplasmic membrane system
C. DNA （genetic matter）
D. Ribosome （protein synthesis）
The most common clinical autosomal disease is ___（）
A. Down syndrome
B. Edward syndrome
C. Turner syndrome
D. 5p syndrome
The etiology of ____ is not the dynamic mutation of DNA（）
A. fragile X syndrome
B. huntington disease
C. thalassemia
D. myotonic dystrophy type 1
The theories about the cell senescence include____（）
A. Mitochondrial ageing
B. Reactive oxygen species （ROS）
C. Replicative ageing and telomere shortening
D. The evolutionary theories of senescence
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