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Life Sciences (XL) PYQs Feb 2012

Latest questions in this category.

125 questions

Physiology Ecology and Evolution

Air at 1 atmospheric pressure (101.325 kPa) and 30 ⁰C with absolute humidity of 0.0218 kg/kg of dry air is flowing in a

Mechanistically, enzyme kinetics involves substrate binding and catalytic efficiency determine reaction rates. This validates 81.80 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: 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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Physiology Ecology and Evolution

650 g of a wet food containing 405 g water is dried in a tray dryer to a final moisture content of 6.8 % (dry basis). It

core biological organization analysis shows structure-function relationships govern cellular processes. Consequently 0.0485 emerges as the valid choice since it integrates fundamental life science principles, aligning with established principles in general biology literature.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

100 kg tomato juice containing 5% Total Solids (w/w) is concentrated to 25% Total Solids (w/w). The total amount of wate

This outcome reflects core biological organization, where structure-function relationships govern cellular processes. Option D captures this correctly because it integrates fundamental life science principles, consistent with textbook descriptions and experimental observations in general biology.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

A mild heat treatment of foods that destroys pathogens and extends its shelf life is called

This outcome reflects core biological organization, where structure-function relationships govern cellular processes. Option D captures this correctly because it integrates fundamental life science principles, consistent with textbook descriptions and experimental observations in general biology.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

Which one of the microorganisms given below is NOT RESPONSIBLE for ropy or stringy fermentation of milk?

Evidence for core biological organization indicates structure-function relationships govern cellular processes. Option D aligns with this, as it integrates fundamental life science principles, reflecting standard interpretations in general biology. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

In an individual, three distinct proteins bind oxygen depending on the location and development stage. While hemoglobin

In biochemistry, enzyme kinetics dictates that substrate binding and catalytic efficiency determine reaction rates. Therefore myoglobin, fetal hemoglobin and hemoglobin, respectively is correct as it reflects active-site specificity and regulation, 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, catalytic mechanisms, allosteric control and metabolic integration supporting enzyme function and pathway regulation.

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Microbiology Immunology and Biotechnology

Red-Green color blindness is an X-linked recessive disorder. In a population which is in the Hardy- Weinberg equilibrium

The principle of Mendelian segregation explains that allele distribution and recombination generate phenotypic variation. Hence 1 in 1000000 fits best because it follows segregation and linkage principles, as documented in authoritative sources on genetics.

Ref: Hartl and Jones, Genetics: Analysis of Genes and Genomes, 8th Edition, Chapter 7, Mutation and DNA Repair, covers mutation types, repair pathways, chromosomal aberrations and genome stability relevant to human genetic disorders.

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Microbiology Immunology and Biotechnology

Glucose and hexanoic acid, each having six carbon atoms can undergo complete biological oxidation. In terms of net ATP g

Mechanistically, verbal and logical reasoning involves grammar, vocabulary and inference determine correct usage. This validates Hexanoic acid produces more ATP than glucose because it meets linguistic and logical standards, a pattern repeatedly demonstrated in general aptitude research.

Ref: Wren and Martin, High School English Grammar and Composition, Revised Edition, Chapter 12, Vocabulary and Usage, discusses synonyms, antonyms, spelling rules, sentence completion and comprehension providing guidance for verbal aptitude.

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Microbiology Immunology and Biotechnology

Chorionic gonadotropin plays an important role in the establishment and maintenance of pregnancy and is synthesized in t

Biologically, enzyme kinetics operates via substrate binding and catalytic efficiency determine reaction rates. Thus Human is appropriate since it reflects active-site specificity and regulation, reinforcing core concepts taught 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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Microbiology Immunology and Biotechnology

Zygotic genes required for the formation of a group of adjacent segment in the developing Drosophila embryo is called

Mechanistically, enzyme kinetics involves substrate binding and catalytic efficiency determine reaction rates. This validates Gap gene 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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Microbiology Immunology and Biotechnology

Methane belched (eructation) out by cattle arises from the carbon dioxide produced

This outcome reflects core biological organization, where structure-function relationships govern cellular processes. Option D captures this correctly because it integrates fundamental life science principles, consistent with textbook descriptions and experimental observations in general biology.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Microbiology Immunology and Biotechnology

An E.coli mutant defective for an enzyme is unable to grow on acetate but grows on glycerol as the sole carbon source. W

The principle of enzyme kinetics explains that substrate binding and catalytic efficiency determine reaction rates. Hence Isocitrate lyase 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.

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