Portage Learning Biod 101 Exam Questions With Correct Verified Answers | 100% Pass (A+ Certified)

1. The rugs of the twisted ladder of the double helix in DNA are made of what? Correct Answer Nitrogenous bases 2. How many nitrogenous bases are there? Correct Answer 4. 3. Name the nitrogenous bases. Correct Answer Adenine (A) Guanine (G) Thymine (T) Cytosine (C) 4. Which nitrogenous bases are purines? Correct Answer Adenine and Guanine 5. Which nitrogenous bases are pyrimidines? Correct Answer Thymine and Cytosine 2 / 42 6. Each nitrogenous base has a __________ __________? Correct Answer Unique Structure 7. What is the unique structure of purines? Correct Answer 2 carbon-nitrogen rings 4 nitrogen atoms 8. What is the unique structure of pyrimidines? Correct Answer 1 carbon-nitrogen ring 2 nitrogen atoms 9. How are the nitrogenous bases linked? Correct Answer Linked by deoxyribose 10. What is a base plus a deoxyribose called? Correct Answer Nucleoside 11. What is a base plus deoxyribose plus a phosphate group called? Correct Answer Nucleotide 12. What is the complimentary pair for purine? 3 / 42 Correct Answer Pyrimidine 13. What is the complimentary pair for thymine? Correct Answer Adenine 14. What is the complimentary pair for guanine? Correct Answer Cytosine 15. What are complimentary pairs held together by? Correct Answer Weak hydrogen bonds 16. Within the helical structure, what are nitrogenous bases said to be in? Correct Answer - Complimentary pairs 17. How do hydrogen bonds occur? Correct Answer When 2 negatively charged atoms share a hydrogen atom. 18. How many hydrogen bonds are formed bonds when adenine pairs with thymine? 4 / 42 Correct Answer 2 hydrogen bonds 19. How many hydrogen bonds are formed when guanine pairs with cytosine? Correct Answer 3 hydrogen bonds 20.