Which of the following provides some evidence that RNA probably evolved before DNA?

A. DNA polymerase has proofreading function.
B. RNA polymerase makes a single-stranded molecule.
C. RNA polymerase uses DNA as a template.
D. RNA polymerase does not require localized unwinding of the DNA.
E. DNA polymerase uses primer, usually made of RNA.


Answer: E. DNA polymerase uses primer, usually made of RNA.

Biology & Microbiology

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This diagram shows a simplified representation of bioenergetics, with arrows representing transfers of energy between various ecological components. Where do humans fall in this diagram?



a. from the sun to decomposers
b. from producers to producers
c. from decomposers to consumers
d. from consumers to the sun

Biology & Microbiology

The work of Reznick and Endler with guppies

shows all of the following EXCEPT that a. life history traits can be inherited. b. life history traits evolve. c. life history traits can be altered over a short period of time. d. predation does not influence the modification of life history traits. e. life history traits are coded for in DNA.

Biology & Microbiology

One of the stop codes to signal ribosomes to stop adding amino acids to the protein chain is

a. UAG. b. GUA. c. AUG. d. TAG. e. ATG.

Biology & Microbiology

Active immunity occurs after transfer of antibodies from mother to fetus

____________________ Indicate whether the statement is true or false.

Biology & Microbiology