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.
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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
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
Some memories are emotionally charged because the amygdala triggers associations between fear and sensory information.
Answer the following statement true (T) or false (F)
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.