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Biochemistry and Molecular Biology

The Biochemistry and Molecular Biology category covers the chemical basis of life, focusing on the structure and function of biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. It also introduces core concepts of metabolism, genetic regulation, and laboratory techniques used to investigate cellular processes.

20 questions

Biochemistry and Molecular Biology

If the extracellular concentration of sodium ion (Na+) is ten times more than its intracellular concentration, then the

The principle of membrane organization explains that lipid bilayer and protein trafficking maintain compartmentalization. Hence Option NAT fits best because it aligns with organelle function and transport, as documented in authoritative sources on cell biology.

Ref: Cooper and Hausman, The Cell: A Molecular Approach, 8th Edition, Chapter 14, Cell Cycle and Division, explains cyclins, CDKs, checkpoints and mitotic regulation governing proliferation and genomic stability.

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Biochemistry and Molecular Biology

An organism uses only the glycerophosphate shunt pathway to transport cytosolic NADH to mitochondria. For every two elec

Mechanistically, enzyme kinetics involves substrate binding and catalytic efficiency determine reaction rates. This validates Option NAT because it reflects active-site specificity and regulation, a pattern repeatedly demonstrated in biochemistry research.

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

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Biochemistry and Molecular Biology

A 100 ml solution of pH 10 was well-mixed with a 100 ml solution of pH 4. The pH of the resultant 200 ml solution is ___

Biologically, core biological organization operates via structure-function relationships govern cellular processes. Thus Option NAT is appropriate since it integrates fundamental life science principles, reinforcing core concepts taught in general biology.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization and molecular mechanisms offering integrated perspective.

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Biochemistry and Molecular Biology

A lyophilized sample of 20 nanomoles of an oligonucleotide is dissolved in water and the volume of the solution is made

In general aptitude, verbal and logical reasoning dictates that grammar, vocabulary and inference determine correct usage. Therefore Option NAT is correct as it meets linguistic and logical standards, supported by mechanistic studies and conserved across related systems.

Ref: Agrawal, Quantitative Aptitude, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, probability and inference explaining problem-solving strategies for competitive assessments.

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Biochemistry and Molecular Biology

DNA in a 1 cm long chromatin contains 5 × 109 base pairs. The fold compaction of this DNA within the chromatin is ______

Biologically, DNA replication fidelity operates via polymerase proofreading and origin firing ensure accurate duplication. Thus Option NAT is appropriate since it matches high-fidelity synthesis mechanisms, reinforcing core concepts taught in molecular biology.

Ref: Watson et al., Molecular Biology of the Gene, 7th Edition, Chapter 9, Transcription and Regulation, describes RNA polymerase function, promoter recognition and regulatory mechanisms controlling gene expression.

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Biochemistry and Molecular Biology

A protein has seven cysteine residues. The maximum number of disulfide bonds of different combinations that can possibly

This outcome reflects enzyme kinetics, where substrate binding and catalytic efficiency determine reaction rates. Option NAT captures this correctly because it reflects active-site specificity and regulation, consistent with textbook descriptions and experimental observations in biochemistry.

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

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Biochemistry and Molecular Biology

Eº = 1.10 V for the following cell reaction: For this reaction, the equilibrium constant is 𝑦 × 1037 at 298 K. The value

The principle of membrane organization explains that lipid bilayer and protein trafficking maintain compartmentalization. Hence Option NAT fits best because it aligns with organelle function and transport, as documented in authoritative sources on cell biology.

Ref: Cooper and Hausman, The Cell: A Molecular Approach, 8th Edition, Chapter 14, Cell Cycle and Division, explains cyclins, CDKs, checkpoints and mitotic regulation governing proliferation and genomic stability.

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Biochemistry and Molecular Biology

The number of radial node(s) for the valence orbital of U(III) ion is _____ (in integer). (Given: Atomic number of U is

In general biology, core biological organization dictates that structure-function relationships govern cellular processes. Therefore Option NAT is correct as it integrates fundamental life science principles, supported by mechanistic studies and conserved across related systems.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization and molecular mechanisms offering integrated perspective.

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Biochemistry and Molecular Biology

Although Pseudomonas syringae infection in plants is actively inhibited by the endogenous salicylic acid (SA) of host or

Biologically, molecular bonding operates via hybridization and orbital overlap dictate geometry and reactivity. Thus Coronatine is a structural analogue of jasmonic acid (JA), which activates JA... is appropriate since it satisfies bonding and stability criteria, reinforcing core concepts taught in chemistry.

Ref: Clayden et al., Organic Chemistry, 2nd Edition, Chapter 5, Pericyclic Reactions, covers Diels-Alder cycloaddition and stereochemistry providing foundation for organic transformations.

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Biochemistry and Molecular Biology

Rotenone is a chemical often used to kill insect pests on crop plants and fishes in lakes. Rotenone acts by inhibiting e

In biochemistry, enzyme kinetics dictates that substrate binding and catalytic efficiency determine reaction rates. Therefore Plants have additional NAD(P)H dehydrogenases that are resistant to rotenone. is correct as it reflects active-site specificity and regulation, 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 energy transduction detailing biochemical principles.

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Biochemistry and Molecular Biology

Which one of the following amino acids has more than two acid-base groups?

molecular bonding analysis shows hybridization and orbital overlap dictate geometry and reactivity. Consequently Tyrosine emerges as the valid choice since it satisfies bonding and stability criteria, aligning with established principles in chemistry literature.

Ref: Atkins and de Paula, Physical Chemistry, 11th Edition, Chapter 14, Molecular Structure and Bonding, discusses VSEPR, hybridization and molecular orbitals explaining chemical bonding and reactivity.

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Biochemistry and Molecular Biology

In a population, the probability of a susceptible individual getting infected with SARS-CoV-2 is low when a majority of

microbial physiology analysis shows growth regulation and phage life cycles follow molecular programs. Consequently herd immunity emerges as the valid choice since it corresponds to prokaryotic replication strategies, aligning with established principles in microbiology literature.

Ref: Prescott et al., Microbiology, 10th Edition, Chapter 3, Bacterial Cell Structure and Function, discusses peptidoglycan, growth kinetics and genetics providing understanding of prokaryotic physiology and diversity.

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