The structural and functional unit of life is a. a cell, b. an organ, c. the organism, d. a molecule.

Verified step by step guidance

1. Step 1: Understand the question by identifying the key phrase 'structural and functional unit of life'.
2. Step 2: Recall the basic biological hierarchy: molecules, cells, tissues, organs, organ systems, organisms.
3. Step 3: Consider the role of each option: a cell, an organ, the organism, a molecule.
4. Step 4: Analyze which option is universally recognized as the smallest unit that can perform all life processes.
5. Step 5: Conclude which option is commonly referred to as the 'structural and functional unit of life' in biological sciences.

Key Concepts

Cell Theory

Cell theory is a fundamental concept in biology that states that all living organisms are composed of cells, which are the basic units of life. This theory emphasizes that cells arise from pre-existing cells and that the cell is the smallest unit of life capable of performing all life processes.

Levels of Biological Organization

Biological organization refers to the hierarchical structure of living organisms, ranging from molecules to cells, tissues, organs, and entire organisms. Understanding this hierarchy is crucial for recognizing how cells function as the basic building blocks of more complex structures and systems in living organisms.

Function of Cells

Cells perform essential functions necessary for life, including metabolism, energy production, and reproduction. Different types of cells have specialized roles, such as muscle cells for movement and nerve cells for signal transmission, highlighting the diversity and complexity of cellular functions within organisms.