Organic compounds
11. American scientists Stanley Miller and Harold Urey used an apparatus similar to
the one in the diagram 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?
A There was no lightning in Earth's early atmosphere.
B Ammonia and methane were not in the early atmosphere.
C The chemicals used in the experiment were contaminated,
D Organic molecules already existed before the atmosphere formed.
12

cuz he is really really short, assuming an unorthodox and inherently unlucky configuration of elevator buttons…

explanation:

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

b.have there own function.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.