Table of contents

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1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

1. Introduction to Biochemistry

Nucleic Acids

Biochemistry

1. Introduction to Biochemistry

Nucleic Acids

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Multiple Choice

Which element is present in adenine but absent in ribose?

Carbon

Oxygen

Hydrogen

Nitrogen

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Verified step by step guidance

Step 1: Begin by understanding the molecular structures of adenine and ribose. Adenine is a nitrogenous base, specifically a purine, while ribose is a sugar molecule found in nucleotides.

Step 2: Analyze the chemical composition of adenine. Adenine contains carbon (C), hydrogen (H), and nitrogen (N) atoms. Nitrogen is a key component of the purine ring structure in adenine.

Step 3: Examine the chemical composition of ribose. Ribose contains carbon (C), hydrogen (H), and oxygen (O) atoms, but it does not contain nitrogen.

Step 4: Compare the two molecules. Identify the element that is present in adenine but absent in ribose. Nitrogen is found in adenine's purine ring but is not present in ribose.

Step 5: Conclude that the element present in adenine but absent in ribose is nitrogen, based on the structural and compositional differences between the two molecules.