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Tri 1 Biochem Past Exams Questions and Answers Already Passed What is the role of zinc in enzyme function? Zinc acts as a cofactor, stabilizing the structure of enzymes and aiding in catalysis. Which type of bond forms between the amino group of one amino acid and the carboxyl group of an...

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  • October 23, 2024
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Tri 1 Biochem Past Exams Questions
and Answers Already Passed
What is the role of zinc in enzyme function?


✔✔ Zinc acts as a cofactor, stabilizing the structure of enzymes and aiding in catalysis.




Which type of bond forms between the amino group of one amino acid and the carboxyl group of

another?


✔✔ A peptide bond forms between the amino and carboxyl groups, linking amino acids together.




How do enzymes use the lock-and-key model to explain substrate binding?


✔✔ The lock-and-key model suggests that enzymes have specific active sites (locks) that fit only

certain substrates (keys).




What distinguishes a purine from a pyrimidine in nucleic acids?


✔✔ Purines have a two-ring structure (adenine and guanine), while pyrimidines have a single-

ring structure (cytosine, thymine, and uracil).




What is the function of chaperone proteins in the cell?


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,✔✔ Chaperone proteins assist in the proper folding of other proteins, preventing aggregation and

misfolding.




How do lipids contribute to membrane structure?


✔✔ Lipids form a bilayer that acts as a barrier, allowing selective permeability and maintaining

cellular integrity.




What type of reaction converts a disaccharide into two monosaccharides?


✔✔ Hydrolysis is the reaction that splits a disaccharide into two monosaccharides by adding

water.




What is the primary purpose of the Krebs cycle in cellular respiration?


✔✔ The Krebs cycle generates electron carriers (NADH and FADH2) and ATP through the

oxidation of acetyl-CoA.




How do post-translational modifications affect proteins?


✔✔ Post-translational modifications can alter protein function, localization, and activity by

adding or removing chemical groups.




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, What is the significance of the Michaelis-Menten equation in enzyme kinetics?


✔✔ The Michaelis-Menten equation describes the relationship between substrate concentration

and reaction velocity, helping to understand enzyme efficiency.




Which amino acid is known for introducing kinks in protein structure?


✔✔ Proline introduces kinks in protein structure due to its unique cyclic structure.




What is the function of glycoproteins in cell recognition?


✔✔ Glycoproteins serve as recognition signals on cell surfaces, playing a crucial role in cell-cell

interactions.




How does the structure of fatty acids influence their function in the body?


✔✔ The saturation level and length of fatty acids affect their fluidity, energy storage, and roles

in signaling pathways.




What role do lipoproteins play in lipid transport?


✔✔ Lipoproteins transport lipids through the bloodstream, aiding in the distribution of fats and

cholesterol.




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