Question:
35S isotope is commonly used in experiments involving which of the following biomolecules?
35S isotope is commonly used in experiments involving which of the following biomolecules?
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35S:
- Labels proteins (cysteine, methionine).
- 32P: Labels nucleic acids (DNA, RNA).
- 14C: Labels carbohydrates and lipids.
- Labels proteins (cysteine, methionine).
- 32P: Labels nucleic acids (DNA, RNA).
- 14C: Labels carbohydrates and lipids.
Updated On: Sep 1, 2026
- Nucleic acids
- Proteins
- Carbohydrates
- Fats and oils
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of isotopic labeling in molecular biology.
Step 2: Detailed Explanation:
35S (Sulfur-35) is commonly used to label proteins.
Sulfur is present in the amino acids cysteine and methionine.
By using 35S-labeled methionine or cysteine, newly synthesized proteins can be tracked.
32P (Phosphorus-32) is commonly used to label nucleic acids because phosphorus is present in DNA and RNA.
14C: Used to label carbohydrates and proteins.
3H: Used to label various biomolecules.
Thus, 35S is used for protein labeling.
Step 3: Final Answer:
Thus, 35S is used in experiments involving proteins, which corresponds to option (B).
[0.5cm]
This question tests knowledge of isotopic labeling in molecular biology.
Step 2: Detailed Explanation:
35S (Sulfur-35) is commonly used to label proteins.
Sulfur is present in the amino acids cysteine and methionine.
By using 35S-labeled methionine or cysteine, newly synthesized proteins can be tracked.
32P (Phosphorus-32) is commonly used to label nucleic acids because phosphorus is present in DNA and RNA.
14C: Used to label carbohydrates and proteins.
3H: Used to label various biomolecules.
Thus, 35S is used for protein labeling.
Step 3: Final Answer:
Thus, 35S is used in experiments involving proteins, which corresponds to option (B).
[0.5cm]
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