According to the passage, Miller and Urey tried to simulate the primitive Earth's condition in lab by connecting a half water-filled flask to another which contained electrodes for inducing electrical charges. Then after introducing electrical shocks to the containment of the flasks they realized that some amino acids that are basic structures of living organisms formed in the water flask. They concluded that the primitive Earth's conditions could reasonably lead to first biologic blocks. In the lecture, however, some points were underlined that cast doubt to this conclusion.
First, the simulated atmosphere in the experiment was exaggerated because the early climates of Earth might not produce such vigorous electrical charges continuously as Miller and Urey did in their experiment. Second, the composition of air in the flask was not the same as the gas mixture of atmosphere in early Earth era. An example is the oxygen that was consumed in Miller-Urey experiment. And the third thing is that amino acids can survive harsh conditions and it is possible that they had existed on Earth already or brought to it by comets and asteroids.
In conclusion, their experiments have some flaws and moreover, cannot explain that how the first living unit comes to life.
According to the passage, Miller and Urey tried to simulate the primitive Earth's condition in lab by connecting a half water-filled
flask
to another which contained electrodes for inducing electrical charges. Then after introducing electrical shocks to the containment of the
flasks
they realized that
some
amino acids that are basic structures of living organisms formed in the water
flask
. They concluded that the primitive Earth's conditions could
reasonably
lead to
first
biologic blocks. In the lecture,
however
,
some
points
were underlined
that cast doubt to this conclusion.
First
, the simulated atmosphere in the
experiment
was exaggerated
because
the early climates of Earth might not produce such vigorous electrical charges
continuously
as Miller and Urey did in their
experiment
. Second, the composition of air in the
flask
was not the same as the gas mixture of atmosphere in early Earth era. An example is the oxygen that
was consumed
in Miller-Urey
experiment
. And the third thing is that amino acids can survive harsh conditions and it is possible that they had existed on Earth already or brought to it by comets and asteroids.
In conclusion
, their
experiments
have
some
flaws and
moreover
, cannot
explain
that how the
first
living unit
comes
to life.