Multiple Choice
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the atomic nucleus of nitrogen-15 contains ________.
a) 7 neutrons.
b) 8 neutrons.
c) 8 protons.
d) 15 protons.
2. Chemistry
Isotopes
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Why are radioactive isotopes useful in scientific research?
A
Because they are not readily incorporated into biological reactions
B
Because they are difficult to detect in small amounts but living cells cannot distinguish them from the corresponding stable isotopes
C
Because they decay spontaneously and give off energy and subatomic particles
D
Because they can be used as tracers to follow particular atoms and molecules through metabolic pathways
Verified step by step guidance1
Understand the concept of radioactive isotopes: Radioactive isotopes are atoms with an unstable nucleus that decay over time, releasing energy and subatomic particles. This property makes them useful in various scientific applications.
Learn about the use of tracers: In biological research, radioactive isotopes can be used as tracers. This means they can be incorporated into molecules to track the movement and transformation of these molecules within living organisms.
Explore metabolic pathways: Metabolic pathways are series of chemical reactions occurring within a cell. By using radioactive isotopes as tracers, scientists can follow the path of specific atoms or molecules through these pathways, gaining insights into cellular processes.
Consider detection methods: Radioactive isotopes are detectable due to the radiation they emit. This allows researchers to monitor their presence and movement in biological systems, providing valuable data on metabolic processes.
Evaluate the benefits: The ability to trace atoms and molecules using radioactive isotopes helps scientists understand complex biological systems, study disease mechanisms, and develop new treatments by observing how substances interact within living organisms.
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