If a radioactive amino acid is given to an organism, the organelle that is going to show radioactivity first is:
Correct answer: B. RER
- A. Golgi Complex
- B. RER
- C. Nucleus
- D. Mitochondria
Explanation
The correct answer is the Rough Endoplasmic Reticulum (RER) because it is where the ribosomes are located, which are the sites of protein synthesis. When a radioactive amino acid is introduced, it is incorporated into new proteins at the ribosomes on the RER, making this organelle the first to show radioactivity. The Golgi Complex, while involved in processing and packaging proteins, only acts after proteins are synthesized. The nucleus does not synthesize proteins, and mitochondria are involved in energy production, not protein synthesis.
Last updated
About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
Practise Cell Structure and Function
2,478 free Cell Structure and Function MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.