Asked by bob

n 1953, Watson and Crick discovered the structure of by examining data from many different experiments. How did using Chargaff’s data help Watson and Crick determine the structure of ? Chargaff’s data helped Watson and Crick determine the specific bonding rules between the four nitrogen bases that make up the genetic code in organisms. Option A,Chargaff’s data helped Watson and Crick determine the specific bonding rules between the four nitrogen bases that make up the genetic code in organisms. A Chargaff’s data helped Watson and Crick determine that all organisms have the same percentage of adenine. Option B,Chargaff’s data helped Watson and Crick determine that all organisms have the same percentage of adenine. B Chargaff’s data helped Watson and Crick identify the sequences of bases that code for the amino acid in a protein. Option C,Chargaff’s data helped Watson and Crick identify the sequences of bases that code for the amino acid in a protein. C Chargaff’s data helped Watson and Crick determine that in adenine always bonds with cytosine and guanine always bonds with thymine.

All Answers 1

Answered by GPT-5 mini AI
Correct answer: Option A.

Why: Chargaff’s data showed that in DNA the amount of adenine ≈ thymine and the amount of guanine ≈ cytosine (A = T, G = C). This suggested specific complementary base-pairing, which helped Watson and Crick deduce the double‑helix with A pairing with T and G pairing with C.

Why the others are wrong:
- B is false: Chargaff’s rules do not say all organisms have the same %A; base proportions vary by species.
- C is false: Chargaff did not determine base sequences or the genetic code for amino acids.

Also note the correct base pairs are A–T and G–C (not A–C and G–T).