What evidence do we have that, in the helical form of the DNA molecule, the base pairs are composed of one purine and one pyrimidine? - Quora
![Which of the following are pyrimidines? A. Adenine B. Cytosine C. Guanine D. Thymine (a) A, B (b) A, C (c) A, D (d) B, C (e) B, D | Homework.Study.com Which of the following are pyrimidines? A. Adenine B. Cytosine C. Guanine D. Thymine (a) A, B (b) A, C (c) A, D (d) B, C (e) B, D | Homework.Study.com](https://homework.study.com/cimages/multimages/16/screen_shot_2021-04-20_at_1.10.29_pm3964081288676193412.png)
Which of the following are pyrimidines? A. Adenine B. Cytosine C. Guanine D. Thymine (a) A, B (b) A, C (c) A, D (d) B, C (e) B, D | Homework.Study.com
![Chemical structures of pyrimidine bases and zebularine, the-furanosyl... | Download Scientific Diagram Chemical structures of pyrimidine bases and zebularine, the-furanosyl... | Download Scientific Diagram](https://www.researchgate.net/publication/6209490/figure/fig1/AS:722649332346880@1549304435008/Chemical-structures-of-pyrimidine-bases-and-zebularine-the-furanosyl-ribonucleoside-of.png)
Chemical structures of pyrimidine bases and zebularine, the-furanosyl... | Download Scientific Diagram
![A) Structures of CPDs formed between two pyrimidine bases. Small balls... | Download Scientific Diagram A) Structures of CPDs formed between two pyrimidine bases. Small balls... | Download Scientific Diagram](https://www.researchgate.net/profile/Fumio-Hanaoka/publication/46820281/figure/fig1/AS:306060469522432@1449981910368/A-Structures-of-CPDs-formed-between-two-pyrimidine-bases-Small-balls-represent-sugar_Q320.jpg)
A) Structures of CPDs formed between two pyrimidine bases. Small balls... | Download Scientific Diagram
![Symmetry | Free Full-Text | On Analogies in Proton-Transfers for Pyrimidine Bases in the Gas Phase (Apolar Environment)—Cytosine Versus Isocytosine Symmetry | Free Full-Text | On Analogies in Proton-Transfers for Pyrimidine Bases in the Gas Phase (Apolar Environment)—Cytosine Versus Isocytosine](https://www.mdpi.com/symmetry/symmetry-15-00342/article_deploy/html/images/symmetry-15-00342-g005.png)