Where are proteins synthesized inside the cell?

Protein synthesis takes place inside the cell immediately after the transcription process. Transcription leads to mRNA synthesis which makes the amino acid, peptides and protein through translation. In the cell, there are specific sites for each function and production including protein synthesis.

Proteins are synthesized inside the cell in a structure called the ribosome, which is found in both prokaryotic and eukaryotic cells.

  • In eukaryotic cells, the ribosomes are located either in the cytoplasm or on the endoplasmic reticulum (ER).
  • The location of ribosomes depends on whether the protein being synthesized is meant for secretion or for use within the cell.
  • Once a protein has been synthesized by the ribosome, it may undergo additional modifications or folding in other parts of the cell.
  • For example, proteins that are meant for secretion or for insertion into the cell membrane may undergo further modification in the ER or the Golgi apparatus.

Other proteins may be targeted to specific organelles, such as the mitochondria or the nucleus, for specific functions.


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CBSE CLASS XII Related Questions

  • 1.
    Assertion (A): The embryo with 8 to 16 blastomeres is called a morula.
    Reason (R): The morula continues to divide and transform into trophoblast.

      • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
      • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
      • Assertion (A) is true, but Reason (R) is false.
      • Assertion (A) is false, but Reason (R) is true.

    • 2.
      Assertion (A): Repetitive sequences make up a very large portion of human genome.
      Reason (R): Repetitive sequences do not have direct coding functions in the genome.

        • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
        • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
        • Assertion (A) is true, but Reason (R) is false.
        • Assertion (A) is false, but Reason (R) is true.

      • 3.
        Identify the stage of follicle where primary oocyte undergoes first meiotic division. Also mention the products of this division.


          • 4.
            Match Column-I with Column-II and choose the correct option:

              • a-i, b-ii, c-iii, d-iv
              • a-ii, b-v, c-i, d-iii
              • a-v, b-iv, c-ii, d-i
              • a-v, b-i, c-iv, d-ii

            • 5.
              Which of the following statements about plasmids is incorrect?

                • Plasmids have the ability to replicate within the bacterial cell.
                • Their replication is controlled by chromosomal DNA.
                • They are autonomously replicating circular extra-chromosomal DNA.
                • They often carry antibiotic resistant genes.

              • 6.
                Identify the parts P, Q, R, S in the figure given below and select the option in the correct order.

                  • P - Seed, Q - Thalamus, R - Mesocarp, S - Endocarp
                  • P - Thalamus, Q - Seed, R - Endocarp, S - Mesocarp
                  • P - Seed, Q - Thalamus, R - Endocarp, S - Mesocarp
                  • P - Thalamus, Q - Seed, R - Mesocarp, S - Endocarp
                CBSE CLASS XII Previous Year Papers

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