Question 2 1 pts Mature mammalian erythrocytes (red blood cells) lack a nucleus.

Question

Question 2 1 pts Mature mammalian erythrocytes (red blood cells) lack a nucleus. During their ~100-120 days lifespan without a nucleus, they continue to synthesize hemoglobin. This O suggests that there is a low level of ribonucleases to degrade the mRNA. still requires DNA coding, although the nuclear membrane is gone, there must be chromatin spread throughout the red blood cell. O is a chemical process that does not require continued living pathways; the red blood cells are essentially dead after they lose their nuclei. O means that both the necessary mRNAs must persist and there must be a low level of ribonucleases present.

Explanation / Answer

Answer: option (b) is correct.

Reason: Since mature mammalian red blood cells lack nuclei, mitochondria and rough endoplasmic reticulum, they do not contain DNA and consequently cannot divide. They also cannot synthesize RNA nor synthesize any new proteins, and consequently, have a limited lifespan.

Therefore, option (b) is correct.

Option A is wrong because it has nothing to do with the production of haemoglobin as mRNA Does not carry the necessary information about its production.

Option C is wrong because living cells need not have nuclei, eg bacteria.

Options D is wrong because of the ribonuclease bind with mRNA, not RBC's haemoglobin.

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