Ribosomes which occur on nuclear membrane and E.R. are engaged in protein synthesis in animal cells. These ribosomes are associated with the endoplasmic reticulum (ER) and are involved in synthesizing proteins for secretion or membrane insertion.
So, the correct option is (A): Ribosomes which occur on nuclear membrane and E.R.
| 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:
