Answer:
(a) The undefined nuclear region is the cytoplasm
of prokaryotic cells is called nucleoid.
The prokaryotic cells consist of a single chromosome,
which is direct content of the cytoplasm i.e., there is no nuclear membrane in
a eukaryotic cell, the nuclear envelope separates the nucleus from the
cytoplasm.
The nuclear envelope contains many pores (the nuclear
pores) and encloses the liquid ground substance, the nucleoplasm. Within
nucleoplasm two types of nuclear structures are embedded?the nucleolus and
chromatin material.
The nucleolus may be one or more in number and is not bounded
by any membrane. It is rich in protein and RNA (Ribonucleic Acid) molecules and
acts as the site for ribosome formation, hence are also known as factory of
ribosomes,
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