- Methane (CH4?).
- Ammonia (NH3?).
- Water vapor (H2?O).
- Free oxygen (O2?).
Category: Biology etea medical mcqs
- A rigid structural support.
- A selective barrier to control the internal environment.
- An energy source for metabolism.
- A mechanism for DNA replication.
- DNA.
- Proteins.
- RNA.
- Lipids.
- Acquired characteristics.
- Natural selection.
- Mutation.
- Gene flow.
- Gradual chemical processes; supernatural event
- Sudden genetic mutations; progressive adaptation
- Biogeographical dispersal; convergent evolution
- Environmental pressures; random chance
- Natural selection.
- Lamarckian inheritance.
- Artificial selection.
- Genetic drift.
- Genes and the mechanism of Mendelian inheritance.
- The fossil record.
- Continental drift.
- Photosynthesis.
- Survival of those best suited to a particular environment.
- Survival of the most physically dominant.
- Survival of the most aggressive.
- Survival of the oldest individuals.
- Be born missing that same limb.
- Have a genetic predisposition for limb loss.
- Be born with all limbs intact.
- Develop the ability to regrow the lost limb.
- Development of true nuclei.
- Photosynthesis and oxygen accumulation.
- Polymerization of monomers into macromolecules.
- Emergence of complex multicellularity.
- Complex, multicellular autotrophs.
- Simple, single-celled heterotrophs.
- Terrestrial organisms with specialized organs.
- Aquatic organisms with advanced sensory systems.
- Acts as a catalyst for synthesis.
- Promotes the breakdown (oxidation) of organic compounds.
- Has no effect on organic molecule formation.
- Is required for the polymerization of monomers.
- Lamarckian inheritance.
- Use and disuse.
- Natural selection.
- Genetic bottleneck.
- Why all organisms in a population survive equally.
- The competition that drives natural selection.
- How organisms can acquire new traits.
- The absence of variation in a population.
- Directly caused by the environment.
- Acquired during an organism's lifetime.
- Random and heritable.
- Always beneficial for survival.
- Random mutations would lead to stronger beaks.
- The beaks would gradually strengthen and become more robust through use, and this trait would be inherited.
- Only birds with naturally stronger beaks would survive.
- The environment would directly cause the beak to strengthen.
- Traits are randomly inherited from parents.
- Traits developed during an organism's lifetime can be passed to offspring.
- Only traits present at birth are heritable.
- Environmental factors have no influence on heredity.
- Sexual reproduction.
- Complex multicellularity.
- The RNA world hypothesis.
- The DNA world hypothesis.
- They demonstrate complex cellular respiration.
- They show how simple organic molecules can self-assemble into membrane-bound structures.
- They are capable of true genetic replication.
- They prove the existence of extraterrestrial life.
