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

1. Introduction to Biochemistry

Proteins

Biochemistry

1. Introduction to Biochemistry

Proteins

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Multiple Choice

Which of the following best describes the primary function of calmodulin in cells?

It transports oxygen in the bloodstream.

It acts as a calcium-binding protein that regulates various enzymes and cellular processes.

It serves as a structural protein in muscle fibers.

It catalyzes the hydrolysis of ATP during muscle contraction.

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Verified step by step guidance

Step 1: Begin by identifying the key term in the question, which is 'calmodulin.' Understand that calmodulin is a protein found in eukaryotic cells.

Step 2: Recall the primary function of calmodulin. It is known to bind calcium ions (Ca²⁺) and act as a regulatory protein for various enzymes and cellular processes.

Step 3: Eliminate incorrect options systematically. For example, calmodulin does not transport oxygen in the bloodstream (this is the role of hemoglobin), nor does it serve as a structural protein in muscle fibers (this is the role of proteins like actin and myosin).

Step 4: Consider the role of calmodulin in muscle contraction. While it is involved in calcium signaling, it does not directly catalyze ATP hydrolysis during muscle contraction (this is performed by myosin ATPase).

Step 5: Conclude that the correct description of calmodulin's primary function is that it acts as a calcium-binding protein that regulates various enzymes and cellular processes.