Question

Which of the following are bound by a single membrane?

• A. Mitochondria
• B. Vacuole
• C. Lysosome
• D. Plastid

Answer 1

Answer: (B), (C)

Lysosome

The correct option is B & C

Explanation of correct option:

Membrane bound organelles

1. The structures within the cell that are surrounded by a biological membrane are called membrane-bound organelles.
2. They can be either single membrane-bound organelles such as Golgi apparatus, lysosomes, vacuole, etc.,or double membrane-bound organelles such as mitochondria, nucleus, and chloroplast.

Lysosomes:

1. Lysosomes, also known as suicide bags are single membrane-bound organelles that help the cells in autolysis.
2. Their key function is to remove waste and debris of foreign particles.
3. They also play important role in digestion.
4. They are only present in animal cells.

Vacuoles:

1. Vacuoles are single membrane-bound, watery fluid-filled organelles present in the cytoplasm of both animal and plant cells.
2. They act as storehouses of food and nutrients for the cell.
3. In the plant cells, also act as lysosomes and help in autolysis and the removal of debris from the cell.

Explanation of incorrect options:

Option A:

1. Mitochondria are double-membrane bound.
2. It is the site of cellular respiration.

Option D:

1. Plastids are double membrane bound organelles.
2. There are mainly 3 types of plastids- chromoplast, leucoplast and chloroplast.

Final answer: Vacuole and Lysosomes are bound by a single membrane.