Question
Biology Question on Cell: the unit of life
DNA is not present in
A
nucleus
B
mitochondria
C
chloroplast
D
ribosomes
Answer
ribosomes
Explanation
Solution
A ribosome is a small spherical body within a living cell that is the site of proteinsynthesis. It does not have DNA.
- DNA is mainly present in the nucleus, however, extranuclear DNA is also found in certain organelles.
- Mitochondrial DNA is significant in maternal inheritance.
- ChloroplastDNA contains genes that are important for photosynthesis.
- DNA is not present in ribosomes.
Ribosomesconsist of two subunits, one large and one small, each of which comprises some RNA (called ribosomal RNA) and protein. They are found in both eukaryotic and prokaryotic cells. They do not have any DNA. Therefore, option D is the correct answer.