题目内容
（请给出正确答案）
A、in the DNA molecule the number of adenines = number of thymines and the number of guanines = number of cytosines
B、in the DNA molecule the number of gua nines and cytosines = the number of adenines and thymines
C、the ratio of (A + T)/(G + C) is constant for a species
D、all the above
E、a and c only
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更多“Chargaff's rules state that （).”相关的问题
A、A与C的含量相等
B、A+T=G+C
C、同一生物体，不同组织的DNA碱基组成不同
D、不同生物体来源的DNA碱基组成不同
E、DNA的碱基组成受营养状况的影响
A．DNA分子中，A+T＝G+C
B．DNA的碱基组成具有种属特异性
C．DNA的碱基组成有组织或器官特异性
D．每种生物的DNA的碱基组成受年龄、生长状况、营养状况和环境等条件的影响
A．G=C，A=T
B．G+A=C+T
C．G+C=A+T
D．同一生物个体的DNA碱基组成没有组织器官特异性
E．DNA的碱基组成有种属特异性
A．Friedrich Miescher Ⅰ．做出了很好的DNA的X-射线图
B．WaIher Flemming Ⅱ．证明A和T等量，G和C等量
C．Robert Feulgen Ⅲ．从脓细胞中分离出核素
D．Erwin Chargaff Ⅳ．确定DNA在染色体上
E．Rosalind Franklin Ⅴ．描述有丝分裂
A. 双螺旋中碱基组成遵循chargaff规则
B. 双螺旋内侧碱基之间借氢键相连
C. 磷酸与脱氧核糖组成双螺旋的骨架
D. 双螺旋结构中两条链方向相同
A、X-ray diffraction
B、cardboard model building
C、Levene's ideas on DNA components
D、Pauling's work on DNA structure
E、cesium chloride density gradients
A、links two nucleotide bases together
B、links the 5-C sugar of one nucleotide to the 3-C sugar of the next nucleotide
C、links two strands of the DNA molecule to gether
D、links two nucleotide bases together
E、none of the above
A、only the bases are replicated
B、the bases are replicated in small fragments
C、only half the DNA molecule is replicated at any one time
D、each new molecule has one strand from the original molecule
E、the two stands of the molecule are repli cated
A、both strands are oriented in a 5' to 3' di rection
B、both strands are oriented in a 3' to 5' di rection
C、the molecule is oriented differently from the rest of the cell
D、only one strand of the molecule replicates
E、one strand is oriented in a 5' to 3' direction and the other in a 3' to 5' direction
A、3' to 5' direction
B、5' to 3' direction
C、3' direction
D、5' direction
E、none of the above
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