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hich of the following are advantages of quaternary structure? Choose all correct nswers 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences 2) Subunit construction may provide the structural basis for protein regulation 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level 5) May have multiple active sites one on each subunit

hich of the following are advantages of quaternary structure? Choose all correct nswers 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences 2) Subunit construction may provide the structural basis for protein regulation 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level 5) May have multiple active sites one on each subunit

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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**Advantages of Quaternary Structure in Proteins** **Which of the following are advantages of quaternary structure? Choose all correct answers:** 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences. 2) Subunit construction may provide the structural basis for protein regulation. 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size. 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level. 5) May have multiple active sites - one on each subunit.
Transcribed Image Text:**Advantages of Quaternary Structure in Proteins** **Which of the following are advantages of quaternary structure? Choose all correct answers:** 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences. 2) Subunit construction may provide the structural basis for protein regulation. 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size. 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level. 5) May have multiple active sites - one on each subunit.
**Understanding Isoenzymes: Study Questions** Which of the following statements are correct about enzymes that are isoenzymes of each other? Choose all correct answers. - [] Isoenzymes are encoded by the same gene (DNA) - [] Isoenzymes are affected by the exact same allosteric effectors - [] Isoenzymes may be subject to different types and levels of regulation - [] Isoenzymes catalyze the same biochemical reactions - [] Isoenzymes have different primary structures **Explanation:** - **Isoenzymes (or isozymes)** are different molecular forms of an enzyme that catalyze the same chemical reaction but have different properties, such as in enzyme kinetics or regulatory responses. - **Encoded by different genes:** Isoenzymes are usually encoded by different genes, not the same gene. - **Regulation and effectors:** They may be regulated differently and can be affected by different allosteric effectors. - **Biochemical reactions:** Despite these differences, isoenzymes catalyze the same biochemical reactions, maintaining the same type of enzymatic activity. - **Structures:** They often have different primary structures (i.e., amino acid sequences). Understanding these unique characteristics of isoenzymes is crucial for appreciating their role in various physiological contexts and how they enhance metabolic flexibility.
Transcribed Image Text:**Understanding Isoenzymes: Study Questions** Which of the following statements are correct about enzymes that are isoenzymes of each other? Choose all correct answers. - [] Isoenzymes are encoded by the same gene (DNA) - [] Isoenzymes are affected by the exact same allosteric effectors - [] Isoenzymes may be subject to different types and levels of regulation - [] Isoenzymes catalyze the same biochemical reactions - [] Isoenzymes have different primary structures **Explanation:** - **Isoenzymes (or isozymes)** are different molecular forms of an enzyme that catalyze the same chemical reaction but have different properties, such as in enzyme kinetics or regulatory responses. - **Encoded by different genes:** Isoenzymes are usually encoded by different genes, not the same gene. - **Regulation and effectors:** They may be regulated differently and can be affected by different allosteric effectors. - **Biochemical reactions:** Despite these differences, isoenzymes catalyze the same biochemical reactions, maintaining the same type of enzymatic activity. - **Structures:** They often have different primary structures (i.e., amino acid sequences). Understanding these unique characteristics of isoenzymes is crucial for appreciating their role in various physiological contexts and how they enhance metabolic flexibility.
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