A:同一生物个体各种体细胞核中的DNA,具有相同的碱基组成
B:DNA只存在于细胞核中
C:细胞缺水和营养不足将影响DNA碱基组成
D:单链DNA分子的碱基含量的A+G=C+T或A+C=G+T
Sunday,June 1
Dear Tony,
Now we are having fun at Tian'anmen Square. The weather is fine. There are many people here. We'll visit the Bird's Nest and the Water Cube. In the evening,we'll have Beijing Duck. I love Beijing. I hope you will come to China soon.
Your friend,
Ben
Tony White__
78 Flower Road__
New York,CBE779D,USA