Read the passage and answer the following question:
In order to prevent changes in volume due to osmosis, unfertilized frog oocyte was bathed in Frog Ringer's solution. The Frog Ringer's solution was supplemented with radiolabeled amino acids. A sample of oocytes was taken every 30 minutes and assayed for radioactivity. At time 1, the oocytes were fertilized. Samples were taken at five-minute intervals after fertilization and assayed for radioactivity. The results are presented in the graph.
The radioactivity measured after fertilization was taken up by

Being incorporated into DNA.

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Being incorporated into proteins.

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Attaching to the cell membrane.

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Endocytosis.

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Associating with carbohydrates.

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Solution

The correct option is B Being incorporated into proteins.
Amino acids are monomer units that join together by peptide linkage during protein synthesis. In the given experiment, radiolabelled amino acid was taken up by zygote which would have been incorporated in proteins. DNA and carbohydrates are polymer of nucleotides and simple sugars respectively; none of these monomers have amino acids.
Therefore, the correct answer is option B.

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