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| Question | Answer |
| Nucleus | Most prominent organelle in the cell. Contains the cell's DNA and directs the synthesis of ribosomes and proteins. |
| Neucloplasm | The nucleus stores chromatin (DNA plus proteins) in a gel-like substance called the nucleoplasm |
| nucleolus | The nucleolus is a condensed region of chromatin where ribosome synthesis occurs. |
| Nuclear membrane/ envelope | The boundary of the nucleus is called the nuclear envelope. It consists of two phospholipid bilayers: an outer membrane and an inner membrane. The nuclear membrane is continuous with the endoplasmic reticulum. |
| nuclear pores | Nuclear pores allow substances to enter and exit the nucleus. |
| nuclear envelope | The nuclear envelope is a double-membrane structure. Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers. Contains pores that control the passage of ions, molecules and RNA. |
| nucleoplasm | The nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus. |
| chromosomes | Chromosomes are structures within the nucleus that are made up of DNA, the hereditary material. In eukaryotes, chromosomes are linear structures. In humans, the chromosome number is 46 |
| chromatin | Chromosomes are only visible and distinguishable from one another when the cell is getting ready to divide. When the cell is in the growth and maintenance phases of its life cycle, proteins are attached to chromosomes, and they resemble an unwound, jumbled bunch of threads. These unwound protein-chromosome complexes are called chromatin |
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