Question

A scientist suspects that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of months. Which of the following substances could be examined for radioactivity to test the hypothesis
a. the cell walls of the plants growing in the ecosystem
b. the muscles of humans living in the ecosystem
c. the sugars produced during photosynthesis by plant growing in the ecosystem
d. the phospholipids in the cell membranes fo organisms living in the ecosystem

Answer 1

Answer:

B

Explanation:

This is because muscles of human cells are made up of proteins filaments of actin and myosin, which contain nitrogen molecule. Definitely this should contain the radioactive nitrogen incorporated.

Answer 2

The muscles of humans living in the ecosystem could be examined for radioactivity to test the hypothesis.

What is radioactivity?

Radioactivity is a process in which an atom emits radiation for a long time.

This is an unstable process, done by the nucleus of the atom.

It happens when the atom wants to release some energy to become stable.

The three types of radiations are :

• Alpha
• Beta
• Gamma

Thus, the correct option is b.

Learn more about radioactivity, here:

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