EVERYDAY SCIENCE

Detailed explanation-1: -Nucleus. Known as the cell’s “command center, ” the nucleus is a large organelle that stores the cell’s DNA (deoxyribonucleic acid). The nucleus controls all of the cell’s activities, such as growth and metabolism, using the DNA’s genetic information.

Detailed explanation-2: -The nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell’s chromosomes and is the place where almost all DNA replication and RNA synthesis occurs.

Detailed explanation-3: -A large oval structure called the nucleus (NOO klee us) acts as a cell’s control center, directing all of the cell’s activities. The nucleus is the largest of the cell’s organelles. Notice in Figure to the left, that the nucleus is surrounded by a membrane, called the nuclear envelope.

Detailed explanation-4: -Chloroplast and mitochondria are the only two organelles that contain their own genetic material.

Detailed explanation-5: -The nucleus (plural, nuclei) houses the cell’s genetic material, or DNA, and is also the site of synthesis for ribosomes, the cellular machines that assemble proteins. Inside the nucleus, chromatin (DNA wrapped around proteins, described further below) is stored in a gel-like substance called nucleoplasm.