Question

The double membrane is absent in

• A. Mitochondria
• B. Chloroplast
• C. Nucleus
• D. Lysosomes

Answer 1

The correct option is D

Lysosomes

The correct option is D.

Explanation of the correct option:

1. An organelle of a cell that is membrane-bound and houses digestive enzymes is called a lysosome.
2. Numerous cell processes involve lysosomes.
3. They disassemble extra or worn-out cell components.
4. They could be utilized to eliminate invasive bacteria and viruses.
5. Lysosomes are solitary membrane-bound organelles that contain digestive enzymes that break down food scraps, bacteria, macromolecules, worn-out organelles, and viruses that have been eaten.
6. Lysosomes do not have a double membrane.

Explanation of the incorrect options:

Option A:

1. The very fact that we require oxygen at all is due to mitochondria.
2. The double-membraned mitochondrion can be informally compared to two bags, one huge and wrinkled and the other smaller and smooth.
3. The region separating the inner and outer membranes is known as the intermembrane gap.
4. It plays a significant part in oxidative phosphorylation, the main function of mitochondria.
5. The enzymes in charge of the processes in the citric acid cycle are found in the matrix.

Option B:

1. The double membrane present in mitochondria and chloroplasts is thought to be a holdover from when prokaryotic bacteria were ingested by their eukaryotic hosts.
2. The exterior membrane appears to have originated from the host cell itself, whereas the inner membrane, which now has several folds, appears to have originated from the bacterial membrane.

Option C:

1. In eukaryotic cells, the nucleus is present.
2. While most cells contain a single nucleus, certain cell types do not, while others have several nuclei.
3. The nucleus of a cell is a membrane-bound organelle composed of the nuclear envelope, a double membrane that surrounds and separates the nuclear contents, and the nuclear matrix, which functions as a cytoskeleton and provides support.

Final answer: The double membrane is absent in lysosomes.