Biology Questions and Answers

Biology Questions and Answers

(the vital elan) that would be the source
of life, a theory known as vitalism.

6. How did the experiments of
   Redi and Pasteur refute the
   hypothesis of spontaneous
   generation?

To refute the spontaneous generation

hypothesis many experiments werperformed. Francisco Redi, in 1668,e (^)
verified that maggots appeared on meat
only whenvironment; within closeen there was exposition to td he
environments, they did not appear. In
1862, Louis Pasteur wneck flasks refuted the abiogenesisorking with swan-
hypothesis definitively. In this
experiment Pasteur boiled (to kill microordemonstrated ganisms) nutritivethat (^)
soups put in swan-neck flasks (with a
curved down mouth so microcould not enter easily) did notorganisms
contaminate with microorganisms while
the same upwards mouths wsoups withiere contaminaten flasks with opend in
a few days. Thwere open refuted the argument of thee fact that both flasks (^)
vitalists that the vital elan could not
enter the flasks. Pasteur swan-necks of the flasks to demonstratebroke the (^)
that proliferation of microorganism
could happen if these beings were ableto reach the broth.

7. What is panspermia?

Panspermia is a hypothesis that
describes liffrom the planet. The idea is that thee on earth as not originated
first living beings that colonized the
earth came from outer space, from

other planets or even from other

galaxiescomets, etc. Accordi by traveling in meteorites,ng to this

hypothesis even the type of life now

existentseeded intentionally on earth could have also been by extraterrestrial (^)
beings in other stellar and planetary
systems.

8. What is the autotrophic
   hypothesis on the origin of
   life?
   The autotropof life assertshic hypothesis on that the first living beings the origin
   on earth were producers of their own
   food, just like chemosynthetic microorplants andganisms.


9. What is the heterotrophic
   hypothesis on the origin of
   life?

Accordinhypothesis the first living beings wereg to the heterotrophic (^)
very simple heterotrophic organisms,
i.e., not which emproducers of their own food,erged from the gradual
association of organic molecules into
small organized structures (tcoacervates). The first organiche
molecules in appeared from substancestheir turn would have of the earth's (^)
primitive atmosphere submitted to
strong electricalradiation and to high temperatur discharges, to solares.
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