Before the three-dimensional structure of dna was discovered, scientists knew that dna contained nitrogenous bases. the table below shows the percentages of the nitrogenous bases in a dna sample. which rule can be used to determine the percentages of the missing nitrogenous bases? complete the table and explain your answer.
base percent:
adenine 23
thymine
cytosine 27
guanine

Complementary base pairing rules

Thymine 23

Guanine 27

Explanation:

Complementary base pairing rules state that adenine always pairs with thymine, and cytosine always pairs with guanine in a double stranded DNA helix This means that in a double stranded DNA molecule, there will be exactly the same amount of thymine as adenine, and exactly the same amount of guanine as cytosine. Therefore, there is 23% of thymine, and 27% of guanine

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"