Table of contents

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

6. Enzymes and Enzyme Kinetics

Enzymes

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzymes

Previous problemNext problem

Struggling with Biochemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which two enzymes are primarily responsible for decomposing nucleotides into phosphate ions, pentose sugars, and nitrogenous bases?

Polymerase and helicase

Nuclease and phosphatase

Ligase and isomerase

Kinase and dehydrogenase

Previous problemNext problem

Verified step by step guidance

Step 1: Understand the decomposition of nucleotides. Nucleotides consist of three main components: phosphate groups, pentose sugars, and nitrogenous bases. To break these down, specific enzymes are required to target each component.

Step 2: Identify the role of nucleases. Nucleases are enzymes that hydrolyze the phosphodiester bonds in nucleic acids, releasing individual nucleotides or nucleotide fragments. This is the first step in breaking down nucleotides.

Step 3: Recognize the role of phosphatases. Phosphatases are enzymes that remove phosphate groups from molecules, including nucleotides. This step releases free phosphate ions from the nucleotide structure.

Step 4: Understand why polymerase and helicase are incorrect. Polymerase synthesizes nucleic acids, while helicase unwinds DNA strands during replication. Neither enzyme is involved in nucleotide decomposition.

Step 5: Confirm that ligase, isomerase, kinase, and dehydrogenase are also incorrect. Ligase joins DNA fragments, isomerase rearranges molecular structures, kinase adds phosphate groups, and dehydrogenase is involved in oxidation-reduction reactions. None of these enzymes decompose nucleotides.