Chemolithotroph obtain their carbon from CO2andenergy from (1) Sunlight (2) Water (3) Inorganic compounds (4) Organic compounds What Are Chemolithotrophs? Chemolithotrophs (from the Greek words chemo for chemical, litho for rock, and troph for nourishment) are […]
Which era is characterized by dramatic diversification among eukaryotes? (1) Cambrian (2) Devonian (3) Carboniferous (4) Triassic Introduction The history of life on Earth is punctuated by periods of rapid […]
The most ancient mode of energy generating metabolic reactions are (1) Photosynthesis (2) Oxidation of Nitrate (3) Oxidation of sulphate (4) Reduction of phosphate The Primordial Earth and Early Metabolism […]
Prebiotic environment was different from present environment and was devoid of (1) CO2 (2) atmosphere (3) O2 (4) N2 The Prebiotic Environment: Earth’s Early Setting The term “prebiotic” refers to […]
Highest mass extinction during history of earth was observed during (1) End of Permian (2) End of cretaceous (3) End of Devonian (4) End of carboniferous Introduction Throughout Earth’s long […]
Source of energy for Urey and Miller experiment was (1) Electric spark (2) UV (3) Glycine (4) ATP The Miller-Urey Experiment: A Landmark in Origin-of-Life Research Stanley Miller and Harold […]
Among the following which gas was totally absent during period of primitive origin of life (1) Oxygen (2) Hydrogen (3) Methane (4) Ammonia The Primitive Atmosphere of Earth Earth’s atmosphere […]
Extensive phyletic diversification of animals was observed in (1) Devonian (2) Silurian (3) Cambrian (4) Mesozoic Introduction Throughout Earth’s history, certain periods stand out for their transformative impact on life. […]
According to the present understanding and evidences the most probable site for origin of life was (1) at deep sea hydrothermal vents (2) In open oceans (3) on different planet […]
Among the following most primitive eukaryotes are- (1) Fungi (2) Diatoms (3) Archeozoa (4) Tricomonads The Rise of Eukaryotes Eukaryotic cells are distinguished by their nucleus, cytoskeleton, and membrane-bound organelles […]
