Question

1. paragraph 1 discusses several important facts regarding the dna molecule. which of the following facts relates to chargaffs rule? a. dna contains a pentose sugar, nitrogenous bases, and a phosphate group. b. dna is a molecule in structure. c. dna contains adenine, thymine, cytosine, and guanine. d. cytosine and guanine appear in equal proportions in dna. 2. with any major scientific discovery, the previous work of many different scientists helps contribute to final conclusions. which of the following scientists work did not contribute to the discovery of the structure of the dna molecule? a. gregor mendel b. linus pauling c. erwin chargaff d. rosalind franklin

Explanation:

1. Chargaff's rule states that in DNA, the amount of cytosine is equal to the amount of guanine, and the amount of adenine is equal to the amount of thymine. So, the fact that cytosine and guanine appear in equal proportions in DNA relates to Chargaff's rule.
2. Gregor Mendel is known for his work on inheritance patterns in pea - plants and laid the foundation for genetics but did not contribute to the discovery of the DNA molecule structure. Linus Pauling's work on molecular structure, Erwin Chargaff's rules about base - pair ratios, and Rosalind Franklin's X - ray crystallography data all contributed to the discovery of the DNA structure.

Answer:

1. D. Cytosine and guanine appear in equal proportions in DNA.
2. A. Gregor Mendel