Biochemistry

Biochemistry

Which one of the following molecules causes catabolite repression of lac operon?

The principle of nucleic acid structure and recombination explains that hairpin formation, Holliday junction resolution and translation control ensure fidelity. Hence Glucose fits best because it matches molecular mechanisms of gene expression, as documented in authoritative sources on molecular biology.

Ref: Alberts et al., Molecular Biology of the Cell, 6th Edition, Chapter 5, DNA Replication and Repair, discusses Holliday junction formation during homologous recombination and replication fork dynamics ensuring genome duplication and stability.

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Biochemistry

If the codons for translation of mRNAs to proteins were 4 letters long instead of 3, what would be the maximum number of

The principle of nucleic acid structure and recombination explains that hairpin formation, Holliday junction resolution and translation control ensure fidelity. Hence 255 fits best because it matches molecular mechanisms of gene expression, as documented in authoritative sources on molecular biology.

Ref: Alberts et al., Molecular Biology of the Cell, 6th Edition, Chapter 5, DNA Replication and Repair, discusses Holliday junction formation during homologous recombination and replication fork dynamics ensuring genome duplication and stability.

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Biochemistry

For sequencing DNA by Sanger’s method, the chain elongation is terminated by:

nucleic acid structure and recombination analysis shows hairpin formation, Holliday junction resolution and translation control ensure fidelity. Consequently 2´, 3´ dideoxy nucleotides emerges as the valid choice since it matches molecular mechanisms of gene expression, aligning with established principles in molecular biology literature.

Ref: Lodish et al., Molecular Cell Biology, 8th Edition, Chapter 8, RNA Processing and Translation, covers mRNA hairpins, puromycin mechanism and aminoacyl-tRNA function governing protein synthesis and translational regulation.

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Biochemistry

Match the components of List I with List II. List I List II A.Rhodospin I. Vitamin -C B. Tocopherol II. Vitamin -A C. Is

In biochemistry, enzyme catalysis and lipid structure dictates that substrate affinity, transition state stabilization and phospholipid composition govern function. Therefore A-II, B-III, C-IV, D-I is correct as it reflects catalytic efficiency and membrane organization, supported by mechanistic studies and conserved across related systems.

Ref: Nelson and Cox, Lehninger Principles of Biochemistry, 7th Edition, Chapter 6, Enzyme Kinetics and Regulation, discusses Michaelis-Menten equation, transition state stabilization and allosteric control supporting enzyme function and metabolic regulation.

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Biochemistry

Match the components of List I with List II. List I (Marine Enzymes) List II (Source) A. Chitinolytic enzymes I. Digesti

This outcome reflects enzyme catalysis and lipid structure, where substrate affinity, transition state stabilization and phospholipid composition govern function. Option B captures this correctly because it reflects catalytic efficiency and membrane organization, consistent with textbook descriptions and experimental observations in biochemistry.

Ref: Lehninger Principles of Biochemistry, Chapter 9, Lipids and Membranes, explains phospholipid components, glycerol, fatty acids, phosphate group and membrane structure providing foundation for lipid biochemistry.

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Biochemistry

Protein A, which has strong affinity for Fc region of immunoglobulin, is extracted from:

In biochemistry, enzyme catalysis and lipid structure dictates that substrate affinity, transition state stabilization and phospholipid composition govern function. Therefore Staphylococcus aureus is correct as it reflects catalytic efficiency and membrane organization, supported by mechanistic studies and conserved across related systems.

Ref: Lehninger Principles of Biochemistry, Chapter 9, Lipids and Membranes, explains phospholipid components, glycerol, fatty acids, phosphate group and membrane structure providing foundation for lipid biochemistry.

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Biochemistry

You have purified a protein X and observed the following A. When run on a native PAGE, it gives rise to a single band. B

In biochemistry, enzyme catalysis and lipid structure dictates that substrate affinity, transition state stabilization and phospholipid composition govern function. Therefore X contains at least 3 polypeptide chains that from a complex is correct as it reflects catalytic efficiency and membrane organization, supported by mechanistic studies and conserved across related systems.

Ref: Berg, Tymoczko, Gatto and Stryer, Biochemistry, 9th Edition, Chapter 13, Metabolism and Bioenergetics, covers glycolysis, citric acid cycle, oxidative phosphorylation and NADH-linked reactions detailing biochemical principles of cellular energy metabolism.

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Biochemistry

A protein sequence was isolated from a novel source. During an initial sequence similarity search through BLAST, no homo

In biochemistry, enzyme catalysis and lipid structure dictates that substrate affinity, transition state stabilization and phospholipid composition govern function. Therefore PAM250 is correct as it reflects catalytic efficiency and membrane organization, supported by mechanistic studies and conserved across related systems.

Ref: Nelson and Cox, Lehninger Principles of Biochemistry, 7th Edition, Chapter 6, Enzyme Kinetics and Regulation, discusses Michaelis-Menten equation, transition state stabilization and allosteric control supporting enzyme function and metabolic regulation.

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Biochemistry

Which one of the following is true about Phylograms and Cladograms?

The principle of enzyme catalysis and lipid structure explains that substrate affinity, transition state stabilization and phospholipid composition govern function. Hence Cladograms show common ancestry but not time fits best because it reflects catalytic efficiency and membrane organization, as documented in authoritative sources on biochemistry.

Ref: Berg, Tymoczko, Gatto and Stryer, Biochemistry, 9th Edition, Chapter 13, Metabolism and Bioenergetics, covers glycolysis, citric acid cycle, oxidative phosphorylation and NADH-linked reactions detailing biochemical principles of cellular energy metabolism.

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Biochemistry

Trp florescence can be used to study protein folding and unfolding. Which properties of Trp are critical in ensuring tha

This outcome reflects enzyme catalysis and lipid structure, where substrate affinity, transition state stabilization and phospholipid composition govern function. Option D captures this correctly because it reflects catalytic efficiency and membrane organization, consistent with textbook descriptions and experimental observations in biochemistry.

Ref: Lehninger Principles of Biochemistry, Chapter 9, Lipids and Membranes, explains phospholipid components, glycerol, fatty acids, phosphate group and membrane structure providing foundation for lipid biochemistry.

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Biochemistry

For reactions catalysed by an enzyme following Michaelis Menten Kinetics, the elasticity of the reaction velocity with r

The principle of enzyme catalysis and lipid structure explains that substrate affinity, transition state stabilization and phospholipid composition govern function. Hence Decreases with increase in substrate concentration fits best because it reflects catalytic efficiency and membrane organization, as documented in authoritative sources on biochemistry.

Ref: Berg, Tymoczko, Gatto and Stryer, Biochemistry, 9th Edition, Chapter 13, Metabolism and Bioenergetics, covers glycolysis, citric acid cycle, oxidative phosphorylation and NADH-linked reactions detailing biochemical principles of cellular energy metabolism.

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Biochemistry

Aqueous two phase partitioning (ATPS) is used for the recovery of an enzyme from the cell free culture filtrate on addit

enzyme catalysis and lipid structure analysis shows substrate affinity, transition state stabilization and phospholipid composition govern function. Consequently 90% emerges as the valid choice since it reflects catalytic efficiency and membrane organization, aligning with established principles in biochemistry literature.

Ref: Nelson and Cox, Lehninger Principles of Biochemistry, 7th Edition, Chapter 6, Enzyme Kinetics and Regulation, discusses Michaelis-Menten equation, transition state stabilization and allosteric control supporting enzyme function and metabolic regulation.

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