Problem 92 - Objective Biology for NEET

Question

Select the correct statement from the following: (A) Biomolecules are in metabolic flux in living state. (B) Living process is a constant effort to prevent falling into equilibrium. (C) Metabolism provides a mechanism for the production of energy. (D) Living state and metabolism is synonymous. (a) All except \(\mathrm{A}\) (b) All except B (c) All except D (d) All of these

Step-by-Step Solution

Answer

The correct answer is option (c) All except D.

Step 1: Evaluate Statement A

Biomolecules are indeed in metabolic flux in the living state, as their levels constantly change due to metabolic processes. So, statement A is correct.

Step 2: Evaluate Statement B

The living process is indeed a constant effort to prevent falling into equilibrium. In equilibrium, there would be no net change in the system, which is not characteristic of living systems that are constantly changing and adapting. So, statement B is also correct.

Step 3: Evaluate Statement C

Metabolism does provide a mechanism for the production of energy. During metabolic processes, energy-rich molecules like glucose, fats, and proteins are broken down to harness energy. So, statement C is correct.

Step 4: Evaluate Statement D

While metabolism is a vital part of the living state, they are not synonymous. The living state refers to all the processes and characteristics that indicate life, such as growth, reproduction, response to environment, etc. Metabolism is one such process. Therefore, Statement D is incorrect.

Step 5: Select the Correct Answer

Since all statements except D are correct, the right answer to this question is 'All except D', so option c is the correct choice.

Key Concepts

Biomolecules

Biomolecules are the essential building blocks that make up living organisms. They include carbohydrates, proteins, lipids, and nucleic acids. These molecules are involved in various metabolic processes essential for life. Metabolic flux refers to the continuous transformation and movement of these biomolecules within a cell. Through metabolic pathways, enzymes convert substrates into different products, which are then used or transformed further.

• This flux is vital for maintaining the cell's functions and supporting growth and repair.
• Examples include the conversion of glucose into energy or amino acids into proteins.

By understanding biomolecules and their roles, we gain insight into how cells maintain their structure and function. This knowledge helps us appreciate the complex chemical orchestra happening in every living organism. In summary, biomolecules are pivotal for maintaining life through their dynamic interactions and transformations.

Energy Production

Energy production is a fundamental aspect of metabolism. It involves the conversion of nutrients into usable energy, often in the form of adenosine triphosphate (ATP). Metabolism encompasses both catabolic reactions, which break down molecules to release energy, and anabolic reactions, which build up molecules and require energy.

• During catabolism, molecules like glucose are broken down in processes like glycolysis and the citric acid cycle.
• These processes generate ATP, the energy currency of the cell, enabling various cellular functions.

The efficiency of energy production is crucial for life, as it powers everything from cellular maintenance to active movement in organisms. Without effective energy production, cells would not be able to sustain the functions necessary for survival.

Living State

The living state refers to the dynamic and ever-evolving conditions necessary to sustain life. It's characterized by constant change and adaptation in response to internal and external stimuli. Living organisms constantly seek to avoid equilibrium, as equilibrium means inactivity and death.

• Essential features of the living state include metabolism, growth, reproduction, and adaptability.
• These features require continuous input and output of energy and matter.

By maintaining these processes, organisms ensure their survival and ability to thrive in various environments. The living state is a delicate balance of ongoing processes that ensure life persists despite the challenges presented by the surroundings.

Equilibrium in Biology

Equilibrium in biology refers to a state where there are no net changes in the concentration of reactants and products over time. While chemical equilibrium is essential in non-living systems, living organisms must actively avoid equilibrium to stay alive.

• If biological systems reach equilibrium, it would indicate stasis, meaning no energy turnover and, consequently, no life.
• For life to exist, organisms must maintain a state of constant change, termed as 'homeostasis'.

Homeostasis involves the regulation of internal conditions despite external fluctuations, keeping the organism's environment optimal for cellular functions. In essence, the dynamic nature of life contrasts with the static nature of equilibrium, highlighting the unique characteristics of living systems.