Problem 16 - Objective Biology for NEET

Question

Which of the following statement is incorrect? (a) All plants, animals, fungi and microbes exhibit metabolism. (b) Interactions among the molecular components of the organelles result into the properties of cell organelles. (c) Properties of cellular organelles are present in the molecular constituents of the organelles. (d) Celluar organization of the body is the defining feature of life forms.

Step-by-Step Solution

Answer

The incorrect statement is (c) 'Properties of cellular organelles are present in the molecular constituents of the organelles.'

Step 1: Analyze each option

Start by looking at each statement individually to understand and determine its veracity.

Step 2: Evaluate option (a)

The statement 'All plants, animals, fungi and microbes exhibit metabolism.' is true. Metabolism includes all of the biochemical reactions in living organisms. Both unicellular and multicellular organisms demonstrate metabolism, thereby making it an essential life process.

Step 3: Evaluate option (b)

The statement 'Interactions among the molecular components of the organelles result into the properties of cell organelles.' is also true. The functionality of organelles in a cell is determined by the interplay of different molecular components. The properties of cell organelles are a result of such interactions.

Step 4: Evaluate option (c)

The statement 'Properties of cellular organelles are present in the molecular constituents of the organelles.' is false. The properties of cell organelles are a result of interactions among molecules, and not inherent in individual molecular constituents.

Step 5: Evaluate option (d)

The statement 'Cellular organization of the body is the defining feature of life forms.' is true. The intricate and organized structure of cells in an organism is what differentiates living things from non-living things.

Key Concepts

Metabolism

Metabolism is a fundamental concept in cell biology that encompasses all chemical reactions involved in maintaining the living state of cells. In simpler terms, metabolism refers to the complex set of life-sustaining transformations and pathways within cells that allow organisms to grow, reproduce, and respond to their environments.
Metabolic reactions are generally categorized into two main types:

• Anabolism: These are constructive metabolic processes. They build larger molecules from smaller units, which usually require energy input. Examples include protein synthesis from amino acids or DNA synthesis from nucleotides.
• Catabolism: These are degradative processes that break down molecules into smaller units, releasing energy. For example, the breakdown of glucose in cellular respiration is a catabolic process.

Every living organism, ranging from microscopic bacteria to complex plants and animals, relies on metabolism for energy. Thus, the statement that all plants, animals, fungi, and microbes exhibit metabolism is inherently true. It's a defining characteristic that distinguishes living organisms from non-living matter.

Cellular Organization

Cellular organization is one of the defining features of all life forms. At its core, it refers to the structured and systematic arrangement of cells that form the tissues, organs, and systems in living organisms.
In biology, each level of organization from cells, tissues, organs, to organ systems plays a vital role in the total functioning of an organism. Some fundamental aspects of cellular organization include:

• Cell Membrane: A key structure that houses the cell, controlling the ingress and egress of substances.
• Nucleus: Often referred to as the "control center", it stores DNA and regulates gene expression.
• Cytoplasm: The gel-like substance filling the cell where organelles reside, providing a medium for chemical processes.

These elements contribute to the highly organized function and structure of living cells. Therefore, the statement that cellular organization is a defining feature of all life forms is accurate. This intrinsic organization is what sets alive entities apart from non-living ones, allowing them to sustain life processes efficiently.

Cell Organelles

Cell organelles are specialized structures within a cell, each performing distinct but interrelated functions critical for cell survival and operation. The functionality of these organelles is a product of the interactions and coordination of various molecular components within them.
Some key organelles and their functions include:

• Mitochondria: Known as the "powerhouse" of the cell, they generate ATP through cellular respiration.
• Ribosomes: Responsible for protein synthesis, translating genetic information into proteins.
• Endoplasmic Reticulum (ER): Involved in protein and lipid synthesis; the rough ER is studded with ribosomes while the smooth ER lacks them.
• Golgi Apparatus: Modifies, sorts, and packages proteins and lipids for secretion or use within the cell.

It’s important to recognize that the unique properties and functionality of a whole organelle stem from these orchestrated interactions. Thus, claiming that properties of cellular organelles are present in the molecular constituents is misleading. Instead, it's their collective synergy that defines their characteristics.