All of the following were likely present on the primitive Earth during the evolution of self replicating molecules EXCEPT

A. amino acids and nucleotides
B. nitrogen
C. simple carbohydrates
D. freestanding liquid water
E. an O2 rich atmosphere


Ans: E. an O2 rich atmosphere

Biology & Microbiology

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The covalent linkage between nucleotides is referred to as a(n) ____ bond

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Mucinase has the greatest effect on the ________.

A. gastrointestinal system B. respiratory system C. genital system D. skin E. urinary system

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A(n) absorption spectrum indicates the relative effectiveness of different wavelengths of light

__________________ Indicate whether the statement is true or false.

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All living things are able to maintain stable internal conditions, whether they are unicellular or complex, multicellular organisms. This property is called:

A. homeostasis B. cellular organization C. metabolism D. heredity

Biology & Microbiology