All of the following is true regarding Spiegelman’s experiment on the origins of

Question

All of the following is true regarding Spiegelman’s experiment on the origins of life except that:

Select one:

a. the most common size of the RNA strand in the final test tubes was a little over 200 nucleotides long.

b. variation in the length of strands occurred at each round of replication.

c. there was no selection for any of the variations in length.

d. shorter RNA sequences were favored by selection, so long as they were not too short.

In 1977 Sidney Fox tried a different approach to testing the prebiotic synthesis of biological molecules. He mixed a number of different amino acids together at a high temperature (120°C) in an environment lacking water. When he subsequently placed the mixture into water to investigate what the amino acids would form, he:

Select one:

a. found some peptide-like structures, but the bonds between the amino acids were weak and unstable.

b. found that a mechanism for joining the amino acids together to make proteins was completely absent.

c. found ribose in very low supply,

d. added CO and had success with creating polypeptides.

In light of recent achievements in the field of genomics, would it be reasonable to expect that the use of comparative genomics might shed light on the extinct genomes of early life?

Select one:

a. Simple prokaryotes today have very different genomes than early life and we could not learn very much from the comparative genomics of the extant species.

b. Despite efforts in molecular prokaryotic genetics, we cannot predict what kinds of genes may have been present in pre-LUCA genomes.

c. Comparative genomics and studies of the bacteria with very small genomes do shed light on a common ancestor and researchers can estimate the minimal characteristics that a cell would need to operate as a living organism.

d. none of the above

Explanation / Answer

1. option D ;

2. option D ;added co and had success with creating polypeptide

3. option B

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