18 public questions tagged with this topic.
Plants cannot absorb nitrogen directly from the atmosphere; they rely on nitrogen-fixing bacteria to convert nitrogen into usable forms.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Decomposition - Process and Factors
Bacillus thuringiensis produces Bt toxin in an inactive form, which becomes active in the insect gut.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biocontrol Agents - Bt Baculovirus Trichoderma
Streptokinase, produced by Streptococcus bacteria, is used as a clot-busting drug.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes in Industrial Products - Organic Acids Enzymes Bioactive Molecules
Statins, produced by Monascus purpureus, are used to lower cholesterol levels in the blood.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes in Industrial Products - Organic Acids Enzymes Bioactive Molecules
Louis Pasteur's experiment showed that life arises from pre-existing life, disproving the theory of spontaneous generation.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Origin of Life - Theories Miller Urey Experiment
Degeneracy means that multiple codons can specify the same amino acid, reducing the impact of mutations.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Genetic Code and Translation
Helicase unwinds the DNA double helix by breaking hydrogen bonds between the two strands.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance DNA Replication - Semiconservative and Machinery
Hormones are secreted in small amounts, but they have significant physiological effects.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Mechanism of Hormone Action - Second Messengers
Linker DNA connecting adjacent nucleosomes constitutes binding site for fifth histone family distinct from core. H1 binds at dyad axis where DNA enters and exits octamer, globular winged-helix domain contacts both linkers while lysine-rich C-terminal tail neutralizes linker DNA charge. Interaction seals nucleosome, determines exit angle and promotes 30 nanometer fiber folding into solenoid or zigzag conformations. Core histones H2A, H2B, H3 remain buried inside octamer forming handshake motifs, not contacting linker extensively. Therefore H1 classifies as linker histone easily extracted at moderate salt 0.5 molar versus core.
Ref: Allan et al., J Mol Biol 1980; Alberts et al., Molecular Biology of the Cell, Chapter 4: Linker Histone H1 Chromatosome
Dominant manner, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.
Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)
Enter cell cycle, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.
Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)
Contact inhibition, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.
Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)
