Question

Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.

Answer 1

(a) Only eukaryotic cells have nuclei. They are absent in prokaryotes.

(b) Cell walls are only present in plant cells. They are absent in all animal cells.

(c) Membrane-bound organelles are organelles surrounded by a double or a single membrane like nucleus, mitochondria, chloroplasts, lysosomes, ER, Golgi bodies etc., are examples of such organelles. These cell organelles are absent in prokaryotes.

(d) All cells arise from pre-existing cells.