Which feature is commonly absent in prokaryotic cells but present in many animal cells?

Which feature is commonly absent in prokaryotic cells but present in many animal cells?

• A. Mitochondria
• B. Nucleus
• C. Chloroplasts
• D. Endoplasmic reticulum

Answer: (B)

The key idea is that animal cells are eukaryotic and have a true, membrane-bound nucleus, while prokaryotic cells do not. In prokaryotes, DNA is located in a nucleoid region without a surrounding membrane. In many animal cells, DNA is housed inside a nucleus that is enclosed by a nuclear envelope with pores, which creates a distinct compartment for storing genetic material and regulating transcription before the RNA is transported to the cytoplasm. This separation of genetic material and control of gene expression is what sets apart many animal cells from prokaryotic cells.

The key idea is that animal cells are eukaryotic and have a true, membrane-bound nucleus, while prokaryotic cells do not. In prokaryotes, DNA is located in a nucleoid region without a surrounding membrane. In many animal cells, DNA is housed inside a nucleus that is enclosed by a nuclear envelope with pores, which creates a distinct compartment for storing genetic material and regulating transcription before the RNA is transported to the cytoplasm. This separation of genetic material and control of gene expression is what sets apart many animal cells from prokaryotic cells.