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MCAT Chemical and Physical Foundations of Biological Systems Flashcards: 4e Atomic Structure Isotopes

Study 4e Atomic Structure Isotopes in MCAT Chemical and Physical Foundations of Biological Systems with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the definition of isotopes of the same element?

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ANSWER

Same ZZ (protons), different AA (neutrons). Isotopes share the same atomic number ZZ but differ in mass number AA due to varying neutron counts.

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MCAT Chemical and Physical Foundations of Biological Systems: Foundational Concepts

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What this deck covers

This deck focuses on 4e Atomic Structure Isotopes, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Chemical and Physical Foundations of Biological Systems.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 43Practice questions for this set
In a metabolic tracing study, a researcher combusts purified glucose isolated from cells fed a mixture of 12CO2^{12}\text{CO}_2 and 13CO2^{13}\text{CO}_2. The CO2_2 produced from combustion is analyzed by mass spectrometry, yielding two dominant peaks at 44.0 amu (assigned to 12C16O2^{12}\text{C}^{16}\text{O}_2) and 45.0 amu (assigned to 13C16O2^{13}\text{C}^{16}\text{O}_2). If the 45.0 amu peak has 25% of the intensity of the 44.0 amu peak, which statement about the carbon isotopes in the original glucose is most consistent with these results? (Use: m(12C)=12.000m(^{12}\text{C})=12.000 amu, m(13C)=13.003m(^{13}\text{C})=13.003 amu, m(16O)=15.995m(^{16}\text{O})=15.995 amu.)
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