AP BIOLOGY

Detailed explanation-1: -The nucleus is a double-membrane bound cell organelle that is located in the eukaryotic cells and composes of the cell’s genetic material – the DNA. Since it maintains the integrity of the genes that control the gene expression hence controlling the cell’s activities, it is known as the control centre of the cell.

Detailed explanation-2: -The nuclear envelope isolates and protects a cell’s DNA from various molecules that could accidentally damage its structure or interfere with its processing. Ribosomes are found in both prokaryotes and eukaryotes.

Detailed explanation-3: -Eukaryotic cells, on the other hand, have chromosomes that are enclosed in a true nucleus, and are therefore separated from the cytoplasm by the nuclear membrane.

Detailed explanation-4: -The Nucleus & Its Structures Eukaryotic cells have a true nucleus, which means the cell’s DNA is surrounded by a membrane. Therefore, the nucleus houses the cell’s DNA and directs the synthesis of proteins and ribosomes, the cellular organelles responsible for protein synthesis.

Detailed explanation-5: -The three structures that provide support and protection in a eukaryotic cell are the cell membrane (animal cells), cell wall (plant and fungi cells), and the cytoskeleton.