What is being described? Contains the nitrogenous base thymine
What will be an ideal response?
DNA
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The 13C/12C isotopic ratio of geological rocks of different ages has been used as evidence for or against past biological activity, because compounds of biological origin
A) do NOT contain 13C. B) have a higher proportion of 13C that compounds of geological origin. C) have a lower proportion of 13C that compounds of geological origin. D) are not well preserved in geological samples.
The speciation of cichlid fishes of the same African crater lake is an example of
a. divergence. b. parapatry. c. gene flow. d. allopatry. e. sympatry.
How many times greater than the calculated background rate is the current rate of extinction estimated to be?
A) 100 B) 50 C) 10 D) 2
How does the energy of an electron relate with the distance from the nucleus?
A. The closer an electron is from the nucleus, the greater its energy. B. The farther an electron is from the nucleus, the greater its energy. C. The farther a proton is from the nucleus, the greater the electron's energy. D. The closer a proton is from the nucleus, the greater the electron's energy. E. The closer a neutron is from the nucleus, the greater the electron's energy.