A researcher observes an isolated system containing complex organic molecules undergoing spontaneous self-assembly into membrane-bound structures. These structures exhibit rudimentary metabolism but no reproduction or heritability. Which characteristic of life is the MOST significant barrier preventing these structures from being classified as living organisms?
Metabolism
Cellular organization
Reproduction and growth
Adaptation
Related Questions
Consider a theoretical organism that utilizes silicon as its primary structural element instead of carbon. Assuming all other characteristics of life are present, which fundamental biological process would be MOST significantly challenged by this substitution?
Cellular respiration
Formation of complex, stable biomolecules
Active transport across membranes
Photosynthesis
Consciousness is regarded as a defining property of living organisms. Which example best demonstrates consciousness in animals?
A river flowing downstream
Clouds forming in the sky
A dog responding to its owner's call
Crystals forming in a saturated solution
Which of the following processes demonstrates adaptation in living organisms?
A stone weathering over time
Formation of rust on iron
Development of camouflage in a chameleon
Sugar dissolving in water
A defining feature of living organisms is their ability to respond to stimuli. Which of these is an example of a plant responding to a stimulus?
A rock rolling down a hill
Water evaporating from a puddle
Phototropism in a sunflower
Salt dissolving in water
