Which ONE of the following statements correctly describes the function of the endoplasmic reticulum (ER) in protein synthesis?Question 12Select one:a.It is the site where new proteins are modified and sorted for export from the cellb.It is the site where transcription of DNA into mRNA occursc.It contains genetic instructions in the form of chromosomesd.It is the membrane network that binds ribosomes during protein translation
Question
Which ONE of the following statements correctly describes the function of the endoplasmic reticulum (ER) in protein synthesis?Question 12Select one:a.It is the site where new proteins are modified and sorted for export from the cellb.It is the site where transcription of DNA into mRNA occursc.It contains genetic instructions in the form of chromosomesd.It is the membrane network that binds ribosomes during protein translation
Solution
The correct answer is:
d. It is the membrane network that binds ribosomes during protein translation
Here's why:
The endoplasmic reticulum (ER) is a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.
During protein synthesis, ribosomes that are bound to the ER translate the mRNA into a protein. This protein then enters the ER where it undergoes further modifications if necessary. Therefore, the ER is the site where ribosomes bind during protein translation, making option d the correct answer.
Options a, b, and c are incorrect because:
a. While the ER does play a role in the modification and sorting of proteins, it is not the primary site of protein synthesis.
b. Transcription of DNA into mRNA occurs in the nucleus, not the ER.
c. Chromosomes, which contain genetic instructions, are located in the nucleus, not the ER.
Similar Questions
Which ONE of the following statements is NOT a feature of the endoplasmic reticulum (ER)?Question 13Select one:a.It contains folded layers of membraneb.It is the site where transcription of DNA into mRNA occursc.Parts of the ER are connected to ribosomes, the sites of protein synthesisd.The ER is involved in protein distribution for further processing after synthesis
The endoplasmic reticulum (ER) is a structure found in eukaryotic cells. It is composed of two parts - the SER and the RER. Which of the following best describes a difference between the RER and the SER. A The rough ER processes toxins, but the smooth ER does not. B The smooth ER is a site of protein synthesis, but the rough ER is not C The rough ER has ribosomes on its surface, but the smooth ER does not. D The smooth ER is part of the endomembrane system, but the rough ER is not.
Which of the following statements is not related to the endoplasmic reticulum?(A) It behaves as transport channel for proteins between nucleus and cytoplasm.(B) It transports materials between various regions in cytoplasm.(C) It can be the site of energy generation.(D) It can be the site of some biochemical activities of the cell.
What is the primary function of the smooth endoplasmic reticulum (SER)?Protein synthesisLipid synthesis and metabolismRibosome attachmentATP production
Regarding rough and smooth endoplasmic reticulum (ER):Group of answer choicesthey are both involved in synthesis of lipidssmooth ER is lined with ribosomesthey are physically connectedrough ER stores calcium
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