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

Naming Nucleosides and Nucleotides

GOB Chemistry

26. Nucleic Acids and Protein Synthesis

Naming Nucleosides and Nucleotides

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3:00 minutes

Problem 8b

Textbook Question

Identify each of the following as a nucleoside or a nucleotide:
b. guanosine

Verified step by step guidance

Understand the difference between a nucleoside and a nucleotide: A nucleoside consists of a nitrogenous base (purine or pyrimidine) attached to a sugar (ribose or deoxyribose), while a nucleotide is a nucleoside with one or more phosphate groups attached to the sugar.

Identify the components of guanosine: Guanosine is composed of the nitrogenous base guanine and the sugar ribose. There is no mention of any phosphate group in guanosine.

Determine whether guanosine is a nucleoside or a nucleotide: Since guanosine contains only a nitrogenous base and a sugar, and lacks any phosphate groups, it is classified as a nucleoside.

Recall the naming convention: Nucleosides that include purine bases (adenine or guanine) are named with the suffix '-osine,' such as guanosine, while those with pyrimidine bases (cytosine, thymine, or uracil) use the suffix '-idine.' This further confirms guanosine is a nucleoside.

Conclude the classification: Based on the absence of phosphate groups and the naming convention, guanosine is identified as a nucleoside.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nucleosides

Nucleosides are organic molecules that consist of a nitrogenous base attached to a sugar molecule, specifically ribose in RNA or deoxyribose in DNA. They do not contain phosphate groups. Examples include adenosine, guanosine, cytidine, and uridine, which are formed when a nitrogenous base is linked to a sugar.

Nucleotides

Nucleotides are the building blocks of nucleic acids and consist of three components: a nitrogenous base, a sugar (ribose or deoxyribose), and one or more phosphate groups. They play crucial roles in cellular metabolism and energy transfer, with ATP (adenosine triphosphate) being a well-known example. Nucleotides can be formed by adding phosphate groups to nucleosides.

Guanosine

Guanosine is a specific type of nucleoside that consists of the nitrogenous base guanine attached to a ribose sugar. It is important in various biological processes, including serving as a building block for RNA. When a phosphate group is added to guanosine, it becomes guanosine monophosphate (GMP), a nucleotide.

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