Fundamental Units of Life

ATP (Adenosine Triphosphate) is primarily produced in the mitochondria during cellular respiration.

E. coli is a bacterium, which is a prokaryotic organism. The others (Rhizopus, Amoeba, Spirogyra) are eukaryotes.

The term 'protoplasm' was coined by Jan Evangelista Purkinje in 1839.

ATP serves as the primary energy currency of the cell, providing immediate energy for various cellular processes.

Protoplasm is often referred to as the physical basis of life because it contains all the components necessary for life processes.

Centrioles are non-membrane-bound organelles involved in cell division. Mitochondria and chloroplasts are double-membrane organelles.

The nerve cell (specifically the motor neuron) is the longest cell in the human body. Other options like liver and kidney are organs or tissues composed of many cells.

The bacterial cell membrane is a phospholipid bilayer embedded with various proteins. Cellulose and chitin are structural carbohydrates found in plant cell walls and fungal cell walls, respectively.

Mature mammalian erythrocytes (red blood cells) lack mitochondria and a nucleus to maximize space for hemoglobin. Other listed cells require mitochondria for energy production.

Prokaryotic cells lack a defined nucleus (and thus a nuclear membrane and nucleolus) and membrane-bound organelles like mitochondria or chloroplasts. Therefore, all the listed items are absent.

Schleiden and Schwann are credited with formulating the Cell Theory, which states that all living organisms are composed of cells as the basic structural and functional unit.

Chromosomes contain DNA, which carries genetic information from parents to offspring, making them the physical basis of heredity. The nucleus contains the chromosomes, but the chromosomes themselves are the carriers.

The ostrich egg is the largest single cell in existence.

Plant cells are distinguished from animal cells by the presence of a rigid cell wall and chloroplasts for photosynthesis. Animal cells lack both of these structures.

The nucleus acts as the control center of the cell because it contains the genetic material (DNA) that regulates cellular activities. Note: 'nucleous' is a typo for nucleus.

Turgidity occurs when water enters the plant cell via endosmosis, causing the cell to swell and press against the cell wall. Plasmolysis is the opposite process where water leaves the cell.

Mitochondrial cristae are folds of the mitochondrial inner membrane that provide an increase in the surface area. This allows a greater space for processes that happen across this membrane.

Mitochondria are the sites of oxidative phosphorylation, the process by which ATP is generated in the cell. This is why they are often called the powerhouses of the cell.

Robert Hooke was the first scientist to discover cell in the cork of a plant.

A hypertonic solution has a higher solute concentration compared to the cell's cytoplasm, causing water to move out of the cell. Hypotonic solutions have lower solute concentrations.

Lysosomes contain digestive enzymes that break down waste materials, cellular debris, and foreign substances, earning them the title of the cell's waste disposal or recycling system.

The plasma membrane is the outermost covering of the cell that separates the contents of the cell from its external environment. The plasma membrane allows or permits the entry and exit of some materials in and out of the cell. It also prevents movement of some other materials. The cell membrane, therefore, is called a selectively permeable membrane.

Gases like oxygen and carbon dioxide move across the cell membrane from areas of high concentration to low concentration through the process of simple diffusion.

The tonoplast is the specialized membrane that surrounds the central vacuole in plant cells, regulating the passage of ions and molecules between the cytosol and the vacuole.