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. Cell Chemistry & Cell Components
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 nature of radioactive isotopes: Radioactive isotopes are atoms with an unstable nucleus that decay over time, releasing energy and subatomic particles.
Recognize the role of radioactive isotopes in research: Due to their instability and the energy they release, radioactive isotopes can be detected with precision, making them useful in tracking processes.
Consider the concept of tracers: In scientific research, tracers are substances with a detectable component, such as a radioactive isotope, that can be followed through a biological system or chemical reaction.
Apply the concept to metabolic pathways: By incorporating radioactive isotopes into molecules, scientists can trace the path and transformation of these molecules through metabolic pathways, providing insights into biological processes.
Evaluate the advantages: Radioactive isotopes are particularly useful because they behave chemically like their stable counterparts, allowing them to integrate naturally into biological systems while still being detectable due to their radioactive properties.
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