Cell Biology and Structure

The endomembrane system is a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.

Cell theory states that all living things are made of cells, cells are the basic unit of life, and all cells come from pre-existing cells. Spontaneous generation was disproven by experiments like those of Pasteur.

The defining feature of a eukaryotic cell is the presence of a membrane-bound nucleus that houses the genetic material.

Cell theory posits that all cells arise from pre-existing cells through the process of cell division.

Cells are considered the basic unit of structure and function in all living organisms.

Robert Hooke coined the term 'cell' because the structures he observed in cork under a microscope reminded him of the small rooms (cellulae) inhabited by monks.

The prefix 'multi-' means many. Therefore, a multicellular organism is one composed of many cells rather than just one.

In biology, the cell is defined as the basic structural, functional, and biological unit of all known living organisms.

Bacteria have cell walls made of peptidoglycan, and fungi have cell walls made of chitin. Viruses are non-cellular and do not possess cell walls.

A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. They are commonly found in bacteria.

Eukaryotic cells are defined by having a membrane-bound nucleus and other membrane-bound organelles. Prokaryotic cells lack these structures.

Prokaryotes are defined by the lack of a membrane-bound nucleus. They do contain DNA, ribosomes, and often pili.

The cell membrane is a selectively permeable barrier that controls the movement of substances into and out of the cell.

Mitochondria are the organelles responsible for cellular respiration, converting chemical energy from food into ATP.