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

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Multiple Choice

What is the most likely consequence for an organism that lacks one or more enzymes in a specific biosynthetic pathway?

The pathway will continue to function normally, as enzymes are not essential for biosynthetic reactions.

The organism will compensate by producing the missing enzyme through alternative genetic pathways.

The organism will be unable to synthesize the end product of that pathway, potentially leading to metabolic disorders or dependence on external sources for that compound.

The organism will increase the rate of the pathway to overcome the missing enzyme.

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Verified step by step guidance

Step 1: Understand the role of enzymes in biosynthetic pathways. Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur. Without enzymes, many reactions in biosynthetic pathways would proceed too slowly or not at all under physiological conditions.

Step 2: Analyze the consequences of missing enzymes in a biosynthetic pathway. If an enzyme is absent, the specific reaction it catalyzes cannot occur, leading to a blockage in the pathway. This prevents the synthesis of the end product of the pathway.

Step 3: Consider the organism's ability to compensate for the missing enzyme. While some organisms may have alternative pathways or mechanisms to bypass the blockage, this is not always possible. In many cases, the organism becomes dependent on external sources for the compound that cannot be synthesized internally.

Step 4: Evaluate the potential impact on the organism. The inability to synthesize essential compounds can lead to metabolic disorders, impaired growth, or other physiological issues. For example, humans with phenylketonuria lack the enzyme phenylalanine hydroxylase, leading to an inability to metabolize phenylalanine properly.

Step 5: Conclude that enzymes are essential for the proper functioning of biosynthetic pathways. The absence of one or more enzymes disrupts the pathway, preventing the synthesis of the end product and potentially causing significant metabolic consequences for the organism.