Cell Biology and Structure

Mitochondria are the sites of cellular respiration, where energy in the form of ATP is generated. This function earns them the title of the powerhouse of the cell.

Cell theory states that all cells arise from pre-existing cells through cell division. This principle, established by Rudolf Virchow in 1855, contradicts the earlier idea of spontaneous generation. Options A, B, and C are scientifically incorrect - cells do not come from kinesised (not a biological term), brain cells, or dead cells.

Cell theory states that all living organisms are composed of one or more cells.

The biological hierarchy is: cell, tissue, organ, organ system, organism. Therefore, organ systems exist between organs and the whole organism.

The biological hierarchy is: cell, tissue, organ. Thus, tissues are the level between cells and organs.

In the hierarchy of life, the organism is the most complex level, representing the complete individual living thing.

An organism is an individual living entity that can carry out all life processes independently.

The cell is the smallest structural and functional unit of an organism that is capable of performing all life processes.

An organ is a structure composed of different types of tissues that work together to perform a specific function.

A tissue is a group of similar cells that work together to perform a specific task or function.

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

Cell Theory is the fundamental scientific theory that states all living organisms are composed of cells. The other theories listed relate to physics or chemistry.

The cell theory states that the cell is the basic structural, functional, and biological unit of all known living organisms. Bones and organelles are components of larger systems.

Cell culture is a technique where cells are grown under controlled conditions, typically outside their natural environment. It involves isolating cells and providing them with the necessary nutrients for growth.

The cell membrane acts as the selective barrier that regulates the passage of materials into and out of the cell.