Dynamic state of body constituents ,concept of Metabolism Questions in English

(B) The formation of $ATP$ from $ADP$ and inorganic phosphate $(Pi)$ is an endergonic reaction.
An endergonic reaction is a chemical reaction in which energy is absorbed from the surroundings.
Since the synthesis of $ATP$ requires the input of energy (derived from catabolic processes like cellular respiration),it is classified as an endergonic process.

(D) Metabolism is of $2$ types:
$(a)$ Anabolism (i.e.,constructive or synthetic processes).
$(b)$ Catabolism (i.e.,catabolic or destructive processes).
Metabolism occurs in all parts of the plant,including aerial,sub-aerial,and underground parts,as every living cell requires energy and chemical synthesis to maintain life.

(C) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions are broadly classified into two types:
$1$. Anabolism: These are constructive or biosynthetic processes that require the input (gain) of energy.
$2$. Catabolism: These are degradative processes that result in the release of energy.
Therefore,metabolism involves either the release or the gain of energy depending on the nature of the chemical reaction.

(C) Gluconeogenesis is the metabolic process by which organisms produce sugars (namely glucose) for catabolic reactions from non-carbohydrate precursors.
These precursors include lactate,glycerol,and glucogenic amino acids.
Therefore,carbohydrates are synthesized from non-carbohydrate sources such as amino acids or lipids.

(A) Anabolism is an endergonic process because it involves the synthesis of complex molecules from simpler ones.
This synthesis requires the input of energy,typically in the form of $ATP$.

(D) Living cells are open systems that require a constant supply of energy to maintain their structure and perform metabolic activities.
Energy transformation (e.g.,converting chemical energy from glucose into $ATP$) and energy transfer (e.g.,movement of energy through metabolic pathways or between molecules) are fundamental processes in cellular metabolism.
These processes do not happen in a specific sequence of 'first' or 'second' but occur simultaneously and continuously as long as the cell is alive to sustain homeostasis.

(C) closed system is defined as a system that can exchange energy (in the form of heat or work) with its surroundings,but cannot exchange matter with its surroundings.
Therefore,the correct option is $C$.

(A) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions involve the synthesis (anabolism) and degradation (catabolism) of biomolecules,which allow cells to acquire,store,and utilize energy to maintain life processes.

(A) The process of ionization of a sodium atom $(Na)$ involves the loss of an electron to form a sodium ion $(Na^+)$.
The chemical equation is: $Na \rightarrow Na^+ + e^-$.
According to the concept of redox reactions,the loss of electrons is defined as oxidation.
Therefore,the ionization of a sodium atom is an example of oxidation.

(D) Potential energy is the energy possessed by an object due to its position or configuration.
Since the coconut is at a certain height above the ground,it possesses gravitational potential energy relative to the ground.
Therefore,the correct answer is potential energy.

(C) The total heat content of a system is defined as its enthalpy $(H)$.
Enthalpy is a thermodynamic property that represents the sum of the internal energy $(U)$ of the system and the product of its pressure $(P)$ and volume $(V)$.
The mathematical expression for enthalpy is $H = U + PV$.
Therefore,the correct option is $C$.

(A) Gluconeogenesis is a metabolic pathway that results in the generation of glucose from certain non-carbohydrate carbon substrates such as lactate,glycerol,and glucogenic amino acids.
It is a vital process that ensures the maintenance of blood glucose levels during fasting or intense exercise.
Therefore,the correct definition is the formation of glucose from non-carbohydrate sources.

(C) The total heat content of a system is defined as enthalpy $(H)$.
It is a thermodynamic property that represents the sum of the internal energy $(U)$ of the system and the product of its pressure $(P)$ and volume $(V)$.
The mathematical expression is $H = U + PV$.
Therefore,the correct option is $C$.

(D) In living cells,energy transformation and energy transfer are fundamental processes that occur continuously to maintain life. Energy transformation involves the conversion of one form of energy into another (e.g.,light energy to chemical energy in photosynthesis,or chemical energy to mechanical energy in muscle contraction). Energy transfer involves the movement of energy from one location or molecule to another (e.g.,electron transport chain). These processes are not sequential in a way that one finishes before the other begins; rather,they are coupled and occur simultaneously and continuously within the metabolic pathways of the cell.

(A) According to the $2^{nd}$ law of thermodynamics,energy transfer is never $100 \%$ efficient because some energy is always lost as heat during the process. This increase in disorder or randomness in a system is known as entropy. Therefore,entropy is the fundamental reason why energy transformations are not perfectly efficient.

(B) Bioenergetics is the branch of biochemistry and cell biology that concerns energy flow through living systems. It involves the study of how organisms acquire,transform,store,and use energy to perform biological work. Thermodynamics is a broader physical science,while kinetic and potential energy are types of energy,not the study of their transformation in living systems.

(D) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions are broadly classified into two types:
$1$. Anabolic reactions (biosynthetic pathways) which involve the construction of complex molecules from simpler ones.
$2$. Catabolic reactions (degradative pathways) which involve the breakdown of complex molecules into simpler ones.
Since both types of reactions occur within a cell to maintain life,metabolic reactions are the result of various anabolic,catabolic,and other chemical processes.

(A) Assertion $A$ states that many molecules participate in biochemical reactions,which is true as thousands of chemical reactions occur simultaneously in living organisms involving various biomolecules.
Reason $R$ states that biochemical reactions are metabolic reactions,which is also true as metabolism is the sum total of all chemical reactions occurring in a living organism.
Since the participation of many molecules in these reactions is a fundamental characteristic of metabolism,Reason $R$ correctly explains Assertion $A$.

(C) Metabolism is the sum total of all chemical reactions occurring in a living organism. Each of the metabolic pathways results in a variety of transformations. Many of these pathways are linked to each other,and the flow of metabolites through these pathways is precisely regulated. Therefore,all cellular activities are the result of these various chemical reactions collectively known as metabolism.

(C) Metabolism is the sum total of all chemical reactions occurring in a living organism. Each of the metabolic reactions results in the transformation of biomolecules. These reactions are essentially biochemical processes that involve the conversion of one substance into another,such as the removal of $CO_2$ from amino acids to make an amine,or the removal of an amino group in a nucleotide base. Therefore,all metabolic activities are fundamentally biochemical processes.

(C) In many biochemical reactions,such as hydrolysis,water is consumed as a reactant. For example,in the breakdown of complex molecules like polysaccharides or proteins,water molecules are added to break the chemical bonds. Therefore,water acts as a reactant in these metabolic processes.

(A) Assertion $(A)$ is true because biochemical reactions involve a vast array of molecules,including enzymes,substrates,cofactors,and products.
Reason $(R)$ is true because metabolism is defined as the sum total of all chemical reactions occurring in a living organism,which are collectively known as biochemical reactions.
Since all biochemical reactions occurring within a living system constitute metabolism,$R$ provides the correct explanation for $A$.

(A) Metabolism consists of two types of pathways: Anabolism and Catabolism.
$1$. Anabolism (Biosynthetic pathways): In this process,complex molecules are synthesized from simpler ones. This process consumes energy (endergonic).
$2$. Catabolism (Degradation pathways): In this process,complex molecules are broken down into simpler ones. This process releases energy (exergonic).
Therefore,the formation of complex molecules from simple molecules is known as anabolism.

(A) Metabolism consists of two types of processes: $1$. $Catabolism$: This involves the breakdown of complex molecules into simpler ones, which releases energy. $2$. $Anabolism$: This involves the synthesis of complex molecules from simpler ones, which requires energy. Therefore, the breakdown of complex molecules into simpler ones is known as $Catabolism$.

(A) Catabolism is the set of metabolic pathways that break down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions. During catabolic processes,complex molecules are broken down into simpler ones,resulting in the release of energy in the form of $ATP$. Therefore,catabolism is an exergonic process.

(D) Metabolism is defined as the sum total of all chemical reactions occurring in a living organism. During these metabolic processes,various biomolecules (substances) are constantly being made and changed into some other biomolecules. For example,in respiration,glucose is broken down into $CO_2$ and $H_2O$ with the release of energy. Thus,the transformation of biomolecules is a fundamental characteristic of all living organisms.

(B) Living organisms require energy to maintain their internal environment,grow,reproduce,and perform various metabolic activities. Energy transformations,such as converting chemical energy from food into $ATP$,are essential for carrying out these vital biological functions. Without these transformations,life processes cannot be sustained.

(D) In living organisms,complex traits and biological processes are the result of metabolic reactions. Metabolism is the sum total of all chemical reactions occurring in a living organism. These reactions are responsible for maintaining the structure and function of the organism,leading to the expression of complex traits.

(A) In thermodynamics,the energy available to do useful work in a system at a constant temperature and pressure is known as $Free \text{ } energy$ (Gibbs free energy).
It represents the portion of the total energy of a system that can be converted into work.
Therefore,the correct option is $A$.

(A) An endergonic process is a chemical reaction in which the standard change in free energy is positive,and energy is absorbed from the surroundings.
Anabolic processes (biosynthesis) involve the construction of complex molecules from simpler ones,which requires an input of energy $(ATP)$.
Therefore,anabolic processes are endergonic in nature.
Conversely,catabolic processes involve the breakdown of complex molecules into simpler ones,which releases energy and are thus exergonic.

(A) Metabolism consists of two types of reactions: $Catabolism$ and $Anabolism$.
$Catabolism$ involves the breakdown of complex molecules into simpler ones,which releases energy (exergonic).
$Anabolism$ involves the synthesis of complex molecules from simpler ones,which requires energy (endergonic).
Since $Catabolic$ processes release energy,the products are at a lower energy level compared to the reactants.
Therefore,the correct option is $A$.

(C) Metabolism is the sum total of all chemical reactions occurring in a living organism. It consists of two types of processes:
$1$. $Anabolism$: Constructive processes where complex molecules are synthesized from simpler ones.
$2$. $Catabolism$: Destructive processes where complex molecules are broken down into simpler ones.
Therefore, metabolism is the combination of both $Anabolism$ and $Catabolism$.

(A) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions involve the transformation of energy,such as the conversion of chemical energy into mechanical energy for movement or heat energy for maintaining body temperature.
Living organisms require energy to perform various biological functions like growth,reproduction,and homeostasis.
Therefore,the energy transformations occurring during metabolism are essential to support these biological activities.
Thus,both $A$ and $R$ are true,and $R$ is the correct explanation of $A$.

(B) Metabolism consists of two types of reactions: anabolism (constructive processes) and catabolism (destructive processes).
Wear and tear in an organism occurs when the rate of catabolic processes (breakdown) exceeds the rate of anabolic processes (synthesis/repair).
Therefore,when the rate of catabolism is higher than anabolism,the organism experiences wear and tear.

(C) Statement $X$ is correct because metabolism is defined as the sum total of all chemical reactions occurring in a living organism.
Statement $Y$ is also correct. Growth in a living organism is the result of a net increase in biomass. This occurs when the rate of anabolism (building up processes) exceeds the rate of catabolism (breaking down processes). Therefore,both statements are correct.

(B) In biological systems,energy transformation follows the laws of thermodynamics.
Organisms capture energy (often in the form of chemical energy like $ATP$) and convert it into $Free energy$ to perform cellular work,such as biosynthesis,transport,and movement.
However,this process is not $100\%$ efficient,and a significant portion of the energy is lost to the environment as $Heat energy$ due to entropy.
Therefore,the useful form obtained for work is $Free energy$,and the dissipated (waste) form is $Heat energy$.

(A) Metabolism consists of two types of processes: $Anabolism$ and $Catabolism$.
$Anabolism$ (constructive metabolism) involves the synthesis of complex molecules from simpler ones,which requires the input of energy. Therefore,the product formed in an anabolic process has a higher energy level than the reactants.
$Catabolism$ (destructive metabolism) involves the breakdown of complex molecules into simpler ones,which releases energy.
Thus,the energy level is higher in the anabolic process.

(C) All living organisms are made of chemicals. These chemicals,small and big,belonging to various classes,sizes,functions,etc.,are constantly being made and changed into some other biomolecules.
These conversions are chemical reactions or metabolic reactions.
There are thousands of metabolic reactions occurring simultaneously inside all living organisms,be they unicellular or multicellular.
All plants,animals,fungi,and microbes exhibit metabolism.
The sum total of all the chemical reactions occurring in our body is metabolism.
Therefore,the collective term for these reactions is metabolism.

(A) Living organisms are open systems that maintain a state of low entropy by constantly consuming energy from their environment. According to the second law of thermodynamics,the entropy of an isolated system always increases. However,living organisms counteract this by importing energy (in the form of food or sunlight) and exporting entropy (in the form of heat and waste). As a result,the internal free energy of a living organism is maintained at a high level,while the entropy within the system is kept low. Therefore,in the context of biological systems,the amount of free energy available to do work decreases as entropy increases during metabolic processes.

(A) Metabolism is defined as the sum total of all the chemical reactions occurring in a living organism. It is a defining feature of all living organisms without exception. Metabolism consists of two types of pathways: $1.$ Anabolism (building up) and $2.$ Catabolism (breaking down).

(C) Metabolism is the sum of two types of processes: Anabolism and Catabolism.
Anabolism is a constructive process where complex molecules are synthesized from simpler ones,requiring energy,and it contributes to the growth of the organism.
Catabolism is a destructive process where complex molecules are broken down,releasing energy.
Growth occurs in an organism when the rate of anabolism exceeds the rate of catabolism.
Therefore,the correct option is $C$.

(C) Metabolism is defined as the sum total of all chemical reactions occurring in a living organism.
Every living cell,whether unicellular or multicellular,constantly undergoes various biochemical reactions to maintain life,grow,and repair itself.
These reactions are essential for energy production,synthesis of biomolecules,and waste removal.
Therefore,the continuous occurrence of diverse biochemical reactions in every cell is the defining characteristic of metabolism.

(D) In living organisms,all complex traits,such as growth,development,and responsiveness,are the result of metabolic reactions occurring within the cells. Metabolism is the sum total of all chemical reactions occurring in a living organism. These reactions are responsible for maintaining the structural and functional integrity of the organism,thereby manifesting complex traits.

(B) In any living system,energy transformation (metabolism) is never $100\%$ efficient. According to the second law of thermodynamics,every energy transformation results in an increase in entropy (disorder) in the universe,often released as heat. Therefore,disorder increases during energy transformation.

(A) Entropy is a measure of the degree of randomness or disorder in a system. According to the second law of thermodynamics,in any spontaneous process,the total entropy of the universe always increases. As entropy increases,the amount of energy available to do useful work (free energy) decreases. Therefore,when entropy increases,the free energy of the system decreases.

(C) Metabolism is the sum total of all chemical reactions occurring in a living organism,which consists of two types: anabolism (constructive processes) and catabolism (destructive processes).
Wear and tear in an organism occurs when the rate of catabolic processes (breakdown) exceeds the rate of anabolic processes (synthesis/repair).
Therefore,when catabolism > anabolism,the body experiences wear and tear.

(C) Metabolism is defined as the sum total of all chemical reactions occurring in a living organism.
Every living cell,whether unicellular or multicellular,continuously performs various biochemical reactions to maintain life,grow,and reproduce.
These reactions involve the breakdown of complex molecules (catabolism) and the synthesis of complex molecules (anabolism).
Therefore,the statement that various types of biochemical reactions are continuously occurring in every cell is the correct description of metabolism.

(B) Statement $P$ is correct because metabolism is defined as the sum total of all chemical reactions occurring in a living organism.
Statement $Q$ is correct because growth is the result of an increase in biomass,which happens when the rate of anabolism (building up) exceeds the rate of catabolism (breaking down).

(C) All living organisms are made of chemicals. These chemicals,small and big,belonging to various classes,sizes,functions,etc.,are constantly being made and changed into some other biomolecules. These conversions are chemical reactions or metabolic reactions. There are thousands of metabolic reactions occurring simultaneously inside all living organisms,be they unicellular or multicellular. Therefore,biochemical processes are constantly occurring in every cell of a living organism.

(A) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions involve the transformation of energy,such as the conversion of chemical energy into mechanical or heat energy.
Metabolism consists of two types of processes: $1.$ Anabolic processes (building up complex molecules) and $2.$ Catabolic processes (breaking down complex molecules).
Therefore,metabolism is not limited to just one type of process,but involves the conversion of energy through both anabolic and catabolic pathways.