Chargaff's rules state that in any DNA molecule
Correct answer: C. the amount of adenine equals thymine and guanine equals cytosine
- A. adenine equals guanine and cytosine equals thymine
- B. the amount of adenine is always greater than that of thymine
- C. the amount of adenine equals thymine and guanine equals cytosine
- D. purines are always more numerous than pyrimidines
Explanation
Because A pairs with T and G pairs with C across the helix, their amounts must match in any double stranded DNA. Pairing A with G instead would ignore the actual hydrogen bonding partners, and purines equal rather than outnumber pyrimidines.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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