Question

某双链DNA分子共有1000个碱基，若碱基A数量为200个，则该DNA分子中碱基G的个数为

A100 B200 C300 D400

Answer 1

选C
A=T=200
故:A+T=400
A+T+C+G=1000
故：C+G=600
C=G
故：G=300

Answer 2

A+T+G+C=1000, A=T=200, C=G=1000-(200+200)/2=300. 答案选C