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 of the following best describes the primary function of the enzyme ligase?

It catalyzes the oxidation-reduction reactions between molecules.

It transfers functional groups from one molecule to another.

It catalyzes the breakdown of large molecules into smaller ones by adding water.

It catalyzes the joining of two molecules by forming a new chemical bond, usually with the hydrolysis of ATP.

Previous problemNext problem

Verified step by step guidance

Step 1: Begin by understanding the role of enzymes in biochemical reactions. Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. Each enzyme has a specific function based on its structure and active site.

Step 2: Review the definition of ligase enzymes. Ligases are a class of enzymes that catalyze the joining of two molecules by forming a new chemical bond. This process often requires energy, which is typically provided by the hydrolysis of ATP.

Step 3: Compare the function of ligase to other enzyme classes mentioned in the options. For example, oxidoreductases catalyze oxidation-reduction reactions, transferases move functional groups between molecules, and hydrolases break down molecules by adding water. Ligase is distinct because it facilitates bond formation rather than bond breaking or group transfer.

Step 4: Analyze the correct answer provided in the problem: 'It catalyzes the joining of two molecules by forming a new chemical bond, usually with the hydrolysis of ATP.' This matches the definition of ligase enzymes and distinguishes them from other enzyme classes.

Step 5: Conclude that the primary function of ligase is to catalyze the joining of two molecules by forming a new chemical bond, typically with the energy provided by ATP hydrolysis. This understanding is essential for recognizing the specific roles of enzymes in metabolic pathways.