Skip to content
Login Register

Biochemistry and Molecular Biology

The Biochemistry and Molecular Biology category gathers questions on the fundamental principles of biochemistry and the mechanisms of molecular biology. It includes topics such as protein structure, enzyme function, DNA replication, transcription, and translation, helping learners build a solid foundation for related exams.

25 questions

Biochemistry and Molecular Biology

The value of AG at 37 °C for the movement of Ca2+ ions from the endoplasmic reticulum where [Ca ²⁺ ] is 1 mM to the cyto

Evidence for membrane organization indicates lipid bilayer and protein trafficking maintain compartmentalization. Option NAT aligns with this, as it aligns with organelle function and transport, reflecting standard interpretations in cell biology.

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

View Details
Biochemistry and Molecular Biology

The predicted molar extinction coefficient at 280 nm for the peptide GEEFHISFLLM1FGAWSTHMYRTYWFIHEMISTRY is ........ M ⁻

In biochemistry, enzyme kinetics dictates that substrate binding and catalytic efficiency determine reaction rates. Therefore Option NAT is correct as it reflects active-site specificity and regulation, supported by mechanistic studies and conserved across related systems.

Ref: Lehninger Principles of Biochemistry, 7th Edition, Chapter 15, Metabolic Regulation, explains hormonal control, allosteric regulation, feedback inhibition and pathway coordination essential for understanding intermediary metabolism and homeostasis.

View Details
Biochemistry and Molecular Biology

A closed circular B-DNA of 4000 base pairs is negatively supercoiled by introduction of 4 writhes. The super helical den

The principle of molecular bonding explains that hybridization and orbital overlap dictate geometry and reactivity. Hence Option NAT fits best because it satisfies bonding and stability criteria, as documented in authoritative sources on chemistry.

Ref: Housecroft and Sharpe, Inorganic Chemistry, 5th Edition, Chapter 4, Coordination and Molecular Geometry, explains crystal field theory, ligand field, bond lengths and molecular geometry relevant to inorganic structures.

View Details
Biochemistry and Molecular Biology

Which of the following techniques is NOT applicable for evaluating the expression of a transgene?

Understanding Mendelian segregation reveals allele distribution and recombination generate phenotypic variation. Therefore Southern blot is correct because it follows segregation and linkage principles, which underpins key processes in genetics. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Pierce, Genetics: A Conceptual Approach, 6th Edition, Chapter 3, Mendelian Inheritance, discusses segregation, independent assortment, genotype-phenotype correlation and pedigree analysis providing core framework for understanding genetic transmission patterns.

View Details
Biochemistry and Molecular Biology

The following table provides information about four proteins. Which one of the following options correctly identifies th

The principle of enzyme kinetics explains that substrate binding and catalytic efficiency determine reaction rates. Hence Chromatrography: SQPR; Electrophoresis: PRQS fits best because it reflects active-site specificity and regulation, 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 energy transduction, detailing biochemical principles of cellular energy metabolism.

View Details
Biochemistry and Molecular Biology

Which one of the following is NOT a receptor tyrosine kinase?

Biologically, enzyme kinetics operates via substrate binding and catalytic efficiency determine reaction rates. Thus Transforming growth factor 13 receptor Options is appropriate since it reflects active-site specificity and regulation, reinforcing core concepts taught in biochemistry.

Ref: Lehninger Principles of Biochemistry, 7th Edition, Chapter 15, Metabolic Regulation, explains hormonal control, allosteric regulation, feedback inhibition and pathway coordination essential for understanding intermediary metabolism and homeostasis.

View Details
Biochemistry and Molecular Biology

Which one of the following amino acid substitutions is likely to cause the largest change in protein conformation?

Evidence for enzyme kinetics indicates substrate binding and catalytic efficiency determine reaction rates. Option D aligns with this, as it reflects active-site specificity and regulation, reflecting standard interpretations in biochemistry.

Ref: Lehninger Principles of Biochemistry, 7th Edition, Chapter 15, Metabolic Regulation, explains hormonal control, allosteric regulation, feedback inhibition and pathway coordination essential for understanding intermediary metabolism and homeostasis.

View Details
Biochemistry and Molecular Biology

Ribulose-5-phosphate epimerase is involved in which one of the following processes?

Understanding enzyme kinetics reveals substrate binding and catalytic efficiency determine reaction rates. Therefore Pentose phosphate pathway is correct because it reflects active-site specificity and regulation, which underpins key processes in biochemistry.

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 of cellular energy metabolism.

View Details
Biochemistry and Molecular Biology

Double haploids in plants can be induced by

Understanding photosynthetic regulation reveals light harvesting and carbon fixation coordinate energy flow. Therefore Colchicine is correct because it supports efficient energy conversion, which underpins key processes in plant biology. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Taiz et al., Plant Physiology, 6th Edition, Chapter 15, Water Relations and Mineral Nutrition, covers xylem transport, phloem translocation, nutrient uptake and stress responses relevant to plant adaptation and productivity.

View Details
Biochemistry and Molecular Biology

An organized and differentiated cell having cytoplasm but no nucleus is found in

Understanding membrane organization reveals lipid bilayer and protein trafficking maintain compartmentalization. Therefore Sieve tube element is correct because it aligns with organelle function and transport, which underpins key processes in cell biology.

Ref: Lodish et al., Molecular Cell Biology, 8th Edition, Chapter 13, Cytoskeleton and Motility, covers microtubules, actin filaments, intermediate filaments and motor proteins explaining cellular architecture, intracellular transport and motility.

View Details
Biochemistry and Molecular Biology

Match the contents of Column I with the most appropriate options in Column II Column I Column II P. Complement C1q i. CD

This outcome reflects membrane organization, where lipid bilayer and protein trafficking maintain compartmentalization. Option C captures this correctly because it aligns with organelle function and transport, consistent with textbook descriptions and experimental observations in cell biology.

Ref: Lodish et al., Molecular Cell Biology, 8th Edition, Chapter 13, Cytoskeleton and Motility, covers microtubules, actin filaments, intermediate filaments and motor proteins explaining cellular architecture, intracellular transport and motility.

View Details
Biochemistry and Molecular Biology

Proteolytic enzymes are usually biosynthesized as large, inactive precursors known as

Mechanistically, enzyme kinetics involves substrate binding and catalytic efficiency determine reaction rates. This validates zymogens because it reflects active-site specificity and regulation, a pattern repeatedly demonstrated in biochemistry research. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Lehninger Principles of Biochemistry, 7th Edition, Chapter 15, Metabolic Regulation, explains hormonal control, allosteric regulation, feedback inhibition and pathway coordination essential for understanding intermediary metabolism and homeostasis.

View Details