American scientists Stanley Miller and Harold Urey used an apparatus similar to the one in the diagram below to simulate how life could have formed on Earth. The apparatus contained hydrogen gas, water vapor, ammonia, and methane. These gases were subjected to a spark, to simulate lightning.
They found that organic molecules could form from the inorganic gases. Their theory of how life began, however, did not hold up under further testing. What crucial fact did they not have when they conducted their experiment?
F. There was no lightning in Earth's early atmosphere.
G. Ammonia and methane were not in the early atmosphere.
H. The chemicals used in the experiment were contaminated.
I. Organic molecules already existed before the atmosphere formed.
Answer ( Write the letter corresponding to your answer):
What is the rationale for your answer?
Answers: 3
Biology, 22.06.2019 00:30
If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?
Answers: 1
Biology, 22.06.2019 05:00
The chemical form of energy that is useable by the cell to do work
Answers: 2
Biology, 22.06.2019 11:00
Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.
Answers: 1
American scientists Stanley Miller and Harold Urey used an apparatus similar to the one in the diagr...
Social Studies, 17.12.2020 18:50
Mathematics, 17.12.2020 18:50
History, 17.12.2020 18:50
English, 17.12.2020 18:50
Mathematics, 17.12.2020 18:50
Biology, 17.12.2020 18:50
Mathematics, 17.12.2020 18:50
Computers and Technology, 17.12.2020 18:50