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Cells in the thyroid gland produce and secrete thyroid hormone (a polymer of amino acids) that helps to regulate metabolism. What organelle is most likely abundant in cells of the thyroid gland?
a) mitochondria.
b) rough endoplasmic reticulum.
c) free ribosomes.
d) lysosomes.

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Iqta

Answer:

b) Rough endoplasmic reticulum (RER)

Explanation:

Rough Endoplasmic Reticulum (RER):

  • RER is a cell organelle responsible for protein production and cellular transport of protein containing vesicles.
  • The membranes of the rough endoplasmic reticulum (RER) are covered by ribosomes which are the sites of protein synthesis.
  • Most enzymes and cell membrane proteins are manufactured in the RER.
  • Organs and cells that secrete enzymes such as the pancreas contain large amounts of RER.

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