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.
    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

    • 2.
      A DNA molecule is 160 base pairs long. It has 30% Guanine. How many Adenine bases are present in this DNA molecule?

        • 48
        • 64
        • 96
        • 192

      • 3.
        Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
        Reason (R) : It was human protein enriched milk containing human alpha lactalbumin.

          • 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.

        • 4.
          The foetal ejection reflex in human triggers the release of _______ hormone from _______

            • oxytocin, foetal pituitary
            • oxytocin, maternal pituitary
            • human chorionic gonadotropin, placenta
            • progesterone, corpus luteum

          • 5.

            In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______. 
             

              • Stratification
              • Layering
              • Fragmentation
              • Population

            • 6.
              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.
              CBSE CLASS XII Previous Year Papers

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