An outer membrane is not present in (a) Lysosomes (b) Mitochondria (c) Plastid (d) Nucleoli?

Question

Answer

Lysosomes have single membrane so there is no concept of inner or outer membrane so A is correct (≡^∇^≡)

Answer

Mitochondria nd choroplast double membraned lysosomes unit membrened nd nucleoli(nucleolous) amembraned bound structure present in nucleus

Answer

Introduction:
An outer membrane is a characteristic feature of certain organelles present in eukaryotic cells. However, it is not present in all organelles.

Explanation:
(a) Lysosomes: Lysosomes are membrane-bound organelles that contain hydrolytic enzymes. They are surrounded by a single membrane and do not possess an outer membrane.

(b) Mitochondria: Mitochondria are double-membrane-bound organelles that are responsible for cellular respiration. They have an outer membrane and an inner membrane.

(c) Plastid: Plastids are organelles found in plant cells that are responsible for photosynthesis and storage of starch and lipids. They have a double membrane, but not an outer membrane.

(d) Nucleoli: Nucleoli are subnuclear structures found within the nucleus of eukaryotic cells. They do not possess a membrane and are not surrounded by an outer membrane.

Conclusion:
In conclusion, an outer membrane is not present in all organelles. It is absent in lysosomes and nucleoli, while present in mitochondria and plastids.

Answer

Correct answer is option (d) Nucleoli

Answer

LYSOSOME , ER, GB & VACUOLE have only single mem...so they all do not posses outer or inner mem...
nuclei means nucleus not nucleolous (+nt in Euk..cell not surrounded by any membrane)
mitochondria,plastid & nucleus(in euk ) have double mem...so all have outer & inner mem..(nucleus in prok..no mem..or naked )

Answer

The nucleolus is a small, dense and spherical structure present in the nucleus of the cell which lacks a membrane and is visible during the interphase of the cell division under the microscope.

This region is dense due to the presence of proteins, DNA and RNA which are formed from specific chromosomal regions called nucleolar organizing regions.

Lysosome, mitochondria and plastids are membraned cell organelles present within a cell.

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