Which of the following pair of cell organelles does not have DNA molecules?
A. Nuclear Envelope and Mitochondria
B. Lysosome and Vacuoles
C. Chloroplast and Vacuoles
D. Mitochondria and Lysosome
Answer (2)
The pair of cell organelles that does not have DNA molecules is the Lysosome and Vacuoles. This is because neither organelle contains their own DNA, unlike mitochondria and chloroplasts, which do. Therefore, the correct option is B.
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To determine which pair of cell organelles does not contain DNA molecules, let's examine each of the options provided:
(A) Nuclear Envelope and Mitochondria :
The nuclear envelope surrounds the nucleus, which contains DNA in the form of chromosomes. Mitochondria, known as the powerhouses of the cell, have their own DNA. Thus, both the nuclear envelope (indirectly, as part of the nucleus) and mitochondria have DNA.
(B) Lysosome and Vacuoles :
Lysosomes are organelles that contain digestive enzymes, and they do not have their own DNA. Vacuoles, which are storage components within cells, also do not contain DNA. Therefore, this pair does not have DNA molecules.
(C) Chloroplast and Vacuoles :
Chloroplasts, found in plant cells, contain their own DNA. Vacuoles, as mentioned, do not contain DNA.
(D) Mitochondria and Lysosome :
Mitochondria have their own DNA, while lysosomes do not.
The correct answer is (B) Lysosome and Vacuoles , as neither of these organelles contains DNA molecules. Lysosomes are primarily involved in breaking down cellular waste, while vacuoles are responsible for storage and maintaining cellular pressure, especially in plant cells. This question touches on the cellular components and their genetic materials, which are essential concepts in high school biology.
