In mature RBC only haemoglobin is present most abudently..it lacks nucleus nd most cell organells...

To determine in which of the following cells the endoplasmic reticulum (ER) is absent, we need to analyze each option.
A: Kidney cells
- Kidney cells are responsible for filtering waste products from the blood and producing urine.
- These cells require the synthesis and transport of various proteins, which is facilitated by the endoplasmic reticulum.
- Therefore, the endoplasmic reticulum is present in kidney cells.
B: Liver cells
- Liver cells, or hepatocytes, perform a wide range of functions, including detoxification and protein synthesis.
- The endoplasmic reticulum, specifically the smooth ER, is involved in the detoxification process and the synthesis of lipids.
- Therefore, the endoplasmic reticulum is present in liver cells.
C: Mammalian mature erythrocytes
- Mammalian mature erythrocytes, or red blood cells, are specialized cells that transport oxygen to tissues.
- These cells lack a nucleus and most organelles, including the endoplasmic reticulum.
- The absence of endoplasmic reticulum allows for more space to accommodate hemoglobin, the protein responsible for oxygen transport.
- Therefore, the endoplasmic reticulum is absent in mammalian mature erythrocytes.
D: Mammalian eye cells
- The term "mammalian eye cells" is quite broad, as the eyes are composed of various cell types, including photoreceptor cells, lens cells, and retinal pigment epithelial cells.
- Each of these cell types has specific functions related to vision and may require the presence of endoplasmic reticulum for protein synthesis or other cellular processes.
- Without more specific information, it is not possible to definitively determine whether the endoplasmic reticulum is present or absent in mammalian eye cells.
Therefore, based on the given options, the correct answer is C: Mammalian mature erythrocytes where the endoplasmic reticulum is absent.