Một đoạn ADN có tổng số 1500 nuclêôtit loại A là 3000 nuclêôtit . Hãy xác định A) số nuclêôtit mỗi loại của đoạn ADN
B) Số liên kết hiđro của đoạn ADN

What is the difference between bacterial infections and viral infections?

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.

Explain what is meant by a river’s load, and describe how the load is carried.