Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

26. Nucleic Acids and Protein Synthesis

Base Pairing

GOB Chemistry

26. Nucleic Acids and Protein Synthesis

Base Pairing

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Multiple Choice

Four species shown below give the percentages of A–T pairings vs G–C pairings. Based on only the information given, which species would have the most significant strength in their base interactions?

Drosophila melanogaster (fruit fly) (55% : 45%)

Zea mays (corn) (51% : 49%)

Neurospora crassa (fungus) (46% : 54%)

Escherichia coli (bacteria) (49% : 51%)

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Verified step by step guidance

Understand that DNA base pairing involves adenine (A) pairing with thymine (T) and guanine (G) pairing with cytosine (C). A–T pairs are held together by two hydrogen bonds, while G–C pairs are held together by three hydrogen bonds.

Recognize that the strength of base interactions in DNA is influenced by the number of hydrogen bonds. More G–C pairs result in stronger interactions due to the additional hydrogen bond compared to A–T pairs.

Analyze the given percentages of A–T and G–C pairings for each species. Higher percentages of G–C pairings indicate stronger base interactions.

Compare the G–C pairing percentages: Drosophila melanogaster (45%), Zea mays (49%), Neurospora crassa (54%), and Escherichia coli (51%).

Identify that Neurospora crassa has the highest percentage of G–C pairings (54%), suggesting it has the most significant strength in its base interactions among the species listed.