Scientists have not yet determined conclusively whether DNA or RNA was the first nucleic acid that evolved on early Earth. Why does this topic interest scientists?

A) It interests scientists because RNA and DNA are the first organic molecules that existed; understanding them is the key to understanding how organic molecules first formed.
B) Early cells could not store or pass information to future generations without nucleic acids.
C) DNA and RNA are the inorganic precursors to all organic molecules formed on early Earth.
D) Miller and Urey found evidence of DNA and RNA in the single amino acids formed in their experiment.


Ans: B) Early cells could not store or pass information to future generations without nucleic acids.

Biology & Microbiology

You might also like to view...

Since 1980, the proportion of adults in the United States who are obese has ____

a. decreased by half b. doubled c. tripled d. decreased dramatically e. stayed the same

Biology & Microbiology

Which of the following is the correct order of taxa

from most inclusive to least inclusive? a. kingdom >>> phylum >>> order >>> class >>> family >>> genus >>> species b. kingdom >>> phylum >>> class >>> order >>> family >>> genus >>> species c. kingdom >>> phylum >>> family >>> order >>> class >>> genus >>> species d. kingdom >>> phylum >>> class >>> order >>> genus >>> family >>> species e. kingdom >>> phylum >>> order >>> family >>> class >>> genus >>> species

Biology & Microbiology

Some memories are emotionally charged because the amygdala triggers associations between fear and sensory information.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Spoilage of canned foods due to inadequate processing, NOT accompanied by gas production, is

A) thermophilic anaerobic spoilage. B) flat sour spoilage. C) spoilage by mesophilic bacteria. D) caused by acid-tolerant fungi. E) putrefactive anaerobic spoilage.

Biology & Microbiology