The nuclear envelope differs from the plasma membrane in that it
Correct answer: C. consists of two membranes perforated by pores
- A. is made of protein only
- B. has no pores of any kind
- C. consists of two membranes perforated by pores
- D. is freely permeable to all molecules
Explanation
Two membranes enclose the nucleus, and the pores that pierce them at intervals let mRNA and ribosomal subunits out and let nucleotides, enzymes and regulatory proteins in, while keeping the chromosomes separate from the cytoplasm. The outer membrane is continuous with the rough endoplasmic reticulum. Free permeability would defeat the whole purpose of enclosing the genetic material.
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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