Na dna molecule the ratio of adenine (a) molecule to thymine (t) is 1: 1. if in a strand of dna there are 1 million a molecules, how many t molecules are expected in the same strand?

a) 1 million

b) 2 million

c) 3 million

d) 4 million

The correct answer to the question above is:

A)   1 million

Since ratio means the quantitative relationship between two values which the frequency of one value is contained within the second value. In this case, it is only 1:1 which means that whatever the number indicated in the first value is equal to the second value. 

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the answer would be d