Can you explain the answer of this question below:Statement A: The sec...
Statement A: The secretary proteins are packed inside the secretory vesicles which are pinched off from the Golgi apparatus.
Statement B: ER is absent in the red blood cells of mammals.
Explanation:
Statement A: The secretary proteins are packed inside the secretory vesicles which are pinched off from the Golgi apparatus.
- The Golgi apparatus is an organelle found in eukaryotic cells. It is responsible for modifying, sorting, and packaging various molecules for secretion or for use within the cell.
- The secretary proteins, also known as secretory proteins, are proteins that are synthesized on ribosomes attached to the rough endoplasmic reticulum (ER).
- After synthesis, these proteins are transported from the ER to the Golgi apparatus for further processing and packaging.
- Inside the Golgi apparatus, the secretary proteins undergo modifications such as glycosylation and sorting.
- Once the proteins are properly modified and sorted, they are packaged into secretory vesicles, which are small membrane-bound sacs.
- These secretory vesicles bud off from the Golgi apparatus and are transported to the plasma membrane.
- Upon reaching the plasma membrane, the secretory vesicles fuse with it, releasing their contents, including the packed secretary proteins, outside the cell through a process called exocytosis.
- Therefore, Statement A is true.
Statement B: ER is absent in the red blood cells of mammals.
- The endoplasmic reticulum (ER) is an organelle present in eukaryotic cells, involved in various functions such as protein synthesis, lipid metabolism, and calcium storage.
- However, in mature mammalian red blood cells (erythrocytes), the ER is absent.
- Red blood cells are specialized cells that lack a nucleus and most organelles to maximize their capacity for oxygen transport.
- During the maturation process of red blood cells, the ER and other organelles are expelled, resulting in a biconcave shape and increased surface area for oxygen binding.
- The absence of the ER in red blood cells allows for more efficient oxygen transport and increases the lifespan of these cells in circulation.
- Therefore, Statement B is true.
Conclusion: Both Statement A and B are true.
Can you explain the answer of this question below:Statement A: The sec...
The secretory proteins are packed inside the secretory vesicles which are formed by Golgi apparatus. Endoplasmic reticulum is absent in the red blood cells of mammals. So, both statements are correct.
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