Biology The Essentials
Quiz 2: The Chemistry of Life
The Most Common Isotope of Carbon Is ¹²C
The most common isotope of carbon is ¹²C.¹⁴C has ____ than ¹²C. A) more protons B) more neutrons C) fewer neutrons D) fewer protons E) more electrons
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¹⁴C and ¹⁴N have the same A) atomic number. B) number of protons. C) mass number. D) number of neutrons. E) number of electrons.
What is an example of matter?4615 A) oxygen gas B) energy C) light D) heat E) None of the answers are correct.
Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are A) also the main elements in organic molecules. B) rare in nonhuman organisms. C) rare on Earth. D) always bonded by hydrogen bonds. E) All answers are correct.
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