The RNA world hypothesis proposes that RNA, not DNA, was the primary genetic material in early life. Which characteristic of RNA makes it a more plausible candidate for this role compared to DNA?
Double-stranded structure
Higher stability
Catalytic activity
Presence of thymine
Related Questions
The evolution of which metabolic process significantly altered Earth's atmospheric composition?
Chemosynthesis
Fermentation
Photosynthesis
Respiration
Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
They could maintain an internal environment different from their surroundings
They were able to grow in size by taking up material from the surroundings
They showed budding or splitting to give rise to similar smaller structures
They had a defined, organized, and heritable mechanism of reproduction
…A… of Russia and …B…. of England proposed that the first form of life could have come from …C… non-living organic molecule. Choose the right option for A, B and C to compete the given NCERT statement
A-Oparin, B-Haldane, C-Post-existing
A-Haldane, B-Oparin, C-Post-existing
A-Oparin, B-Haldane, C-Pre-existing
A-Haldane, B-Oparin, C-Pre-existing
Theory of spontaneous generation or abiogenesis was first disproved by
A R Wallace
Francisco Redi
Louis Pasteur
A I Oparin
Life cannot originate from inorganic material on present earth, because of
High environmental pollution
Very low atmospheric temperature
Large amount of in atmosphere
Absence of appropriate materials
A microsphere is a …A… collection of organic macromolecules with double layered outer boundary. The term microsphere was given by …B…
Complete the given statement by choosing correct options for A and B with reference to NCERT textbook
A-non-living, B-Sydney Fox
A-living, B-Oparin
A-non-living, B-Haldane
A-living, B-Altman
According to the current understanding of abiogenesis, which of the following represents the likely order of events leading to the first cells?
Polymerization → Synthesis of monomers → Protobiont formation → DNA-based genetic systems
Synthesis of monomers → Polymerization → Protobiont formation → DNA-based genetic systems
Protobiont formation → Synthesis of monomers → Polymerization → DNA-based genetic systems
DNA-based genetic systems → Protobiont formation → Polymerization → Synthesis of monomers
Miller and Urey performed an experiment to prove the origin of life. They took gases along with
The …A… from the sun broke up water into hydrogen and oxygen and the …B… escaped. Oxygen combined with ammonia and methane to form …C… . CO and others. The ozone layer was formed. As it cooled, the water vapour fell as rain, to fill all the depressions and form …D… Choose the correct option for A,B,C and D to complete the given paragraph, to NCERT textbook
A-IR rays, B-lighter , C-water, D-oceans
A-UV rays, B-lighter , C-water, D-oceans
A-UV rays, B-heavier , C-water, D-oceans
A-UV rays, B-heavier , C-water, D-oceans
What happened to present in the primary atmosphere during its conversion to the secondary atmosphere?
It got oxidized to and water
It was absorbed by photoautotrophs
Most of it got oxidized to nitrogen oxides
It concentration was decreased due to formation
