DNA is mainly present in the nucleus, however, extranuclear DNA is also found in certain organelles.
ribosomes
A ribosome is a small spherical body within a living cell that is the site of protein synthesis. It does not have DNA.
Ribosomes consist 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.
| Pair of skeletal parts | Category | |
|---|---|---|
| (a)$\,\,$ | Sternum and ribs$\,\,$ | Axial skeleton |
| (b)$\,\,$ | Clavicle and glenoid cavity$\,\,$ | Pelvic girdle |
| (c)$\,\,$ | Flumerus and ulna$\,\,$ | Appendicular skeleton |
| (d)$\,\,$ | Malleus and stapes$\,\,$ | Ear ossicles |
| Column I | Column II | |
|---|---|---|
| A. | Thylakoids | (i) Disc-shaped sacs in Golgi apparatus |
| B | Cristate | (ii) Condensed structure of DNA |
| C | Cisternae | (iii) Flat membranous sacs in stroma |
| D | Chomatin | (iv) Infolding in mitochondria |
| A | B | C | D | |
|---|---|---|---|---|
| (1) | (v) | (iv) | (viii) | (iii) |
| (2) | (i) | (iv) | (viii) | (vi) |
| (3) | (vi) | (v) | (iv) | (vii) |
| (4) | (v) | (i) | (iii) | (ii) |
Read More: Fundamental Unit of Life: Cell
The different parts of a cell and their functions are as follows:
