Match the following:
| a. Plasma membrane | 1. are thread-like structures usually present in the nucleus that become visible only during cell division |
| b. Chromosomes | 2. are the dense, spherical and grannular particles which occur freely in the matrix or remain attached to the endoplasmic reticulum |
| c. Ribosomes | 3. is a living, thin, delicate, elastic and selective permeable membrane |
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