I am doing test corrections and I am having trouble determining an answer for th

Question

I am doing test corrections and I am having trouble determining an answer for this question:

Assume a eukaryotic cell/organism is grown in a nutrient medium containing the radioactive isotope of nitrogen (15N). After a 72-hour incubation period the 15N would not be expected to be found in the cell’s _____ (mark both APPROPRIATE choices // 2 total)

A. Cellular phospholipids that make up the majority of the cell membrane

B. Cell wall polysaccharides of fungal cells or the exoskeleton of arthopods

C. Short term energy storage nucleotides located within the cytoplasm of the cell

D. Molecules making up the polypeptide component of the ribosomes

E. Steroid or hopanoids located in the plasma membrane of the eukaryotic or prokaryotic cells

Also, please explain at how you arrived at those answers, thanks.

Explanation / Answer

A. Cellular phospholipids that make up the majority of the cell membrane

B. Cell wall polysaccharides of fungal cells or the exoskeleton of arthopods

These two are the correct answers as they do not contain nitrogen in them.

Nucleotides, proteins, polypeptides, and even steroids contain nitrogen in them. Therefore, there is a possibility of containing even radioactive isotope of nitrogen (15N) after a 72-hour incubation period.

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