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Which of the following is not true of adult stem cells?
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2. Cell Chemistry & Cell Components
Isotopes
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How are Carbon-13 and Nitrogen-15 respectively different from the more abundant isotopes Carbon-12 and Nitrogen-14? Carbon-13 and Nitrogen-15 _______________:
A
Each have an extra neutron.
B
Each have an extra proton.
C
Each have one less neutron.
D
Each have one less proton.
E
Each have one less electron.
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Understand the concept of isotopes: Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
Identify the atomic structure of Carbon-12 and Carbon-13: Carbon-12 has 6 protons and 6 neutrons, while Carbon-13 has 6 protons and 7 neutrons.
Identify the atomic structure of Nitrogen-14 and Nitrogen-15: Nitrogen-14 has 7 protons and 7 neutrons, while Nitrogen-15 has 7 protons and 8 neutrons.
Compare the neutron count: Carbon-13 has one more neutron than Carbon-12, and Nitrogen-15 has one more neutron than Nitrogen-14.
Conclude that the difference between these isotopes is the number of neutrons, with Carbon-13 and Nitrogen-15 each having an extra neutron compared to their more abundant counterparts.
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