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

(D) Metabolism is the sum total of all chemical reactions occurring in a living organism. It is a defining feature of all living organisms. Non-living objects do not exhibit metabolism because they lack the cellular machinery required for these complex biochemical processes. Therefore,the statement that 'Non-living objects exhibit metabolism' is incorrect.

(D) Metabolism is the sum total of all chemical reactions occurring in a living organism.
These reactions involve the conversion of energy and the synthesis or breakdown of molecules necessary for life.
It is a defining feature of all living organisms.

(C) Metabolism is a defining feature of all living organisms. It is defined as the sum total of all chemical reactions occurring in a living body. These reactions involve the conversion of chemicals into other forms,which can be either anabolic (constructive) or catabolic (destructive). Therefore,option $C$ is the most accurate definition.

(C) Anabolic pathways are biosynthetic pathways that lead to the formation of more complex structures from simpler ones,requiring energy.
Catabolic pathways are degradative pathways that lead to the breakdown of complex molecules into simpler ones,releasing energy.
$I$. Glucose $\rightarrow$ Lactic acid is a process of glycolysis (anaerobic respiration),where a complex molecule (glucose) is broken down into simpler molecules (lactic acid). Thus,it is a catabolic process.
$II$. Amino acids $\rightarrow$ Proteins is a process of protein synthesis,where simpler molecules (amino acids) are joined to form a complex molecule (protein). Thus,it is an anabolic process.
Therefore,$I$ is catabolic and $II$ is anabolic.

(B) Metabolic pathways in a cell are broadly classified into catabolic and anabolic pathways.
Catabolic pathways involve the breakdown of complex molecules into simpler ones,a process that releases energy (exergonic).
Anabolic pathways involve the synthesis of complex molecules from simpler ones,a process that requires energy (endergonic).
These two pathways are coupled because the free energy released during catabolic reactions is captured (often in the form of $ATP$) and subsequently used to drive the energy-requiring anabolic reactions.
Therefore,the coupling ensures the efficient utilization of energy within the cell.

(A) In a chemical or biochemical reaction, the energy change $(\Delta H)$ is determined by the difference between the energy level of the products $(P)$ and the substrates $(S)$.
If the energy level of the product $(P)$ is lower than the energy level of the substrate $(S)$, it means that energy has been released during the reaction.
This type of reaction is known as an exothermic reaction (or exergonic in biological contexts).
Conversely, if the product level were higher than the substrate level, the reaction would be endothermic (or endergonic), requiring an input of energy.

(A) The Basal Metabolic Rate $(BMR)$ is defined as the energy requirement of the body at rest. Smaller organisms have a higher surface-area-to-volume ratio,leading to greater heat loss and consequently a higher $BMR$ per gram of body weight to maintain homeostasis.
Metabolic rate is directly correlated with physiological parameters like heart rate. $A$ six-month-old baby has a significantly higher metabolic demand and a faster heart rate ($70-190$ beats/minute) compared to an elderly person ($60-100$ beats/minute).
Therefore,both statements are correct,and the higher heart rate in a baby serves as a physiological example supporting the higher metabolic rate observed in smaller organisms.

(N/A) $\Rightarrow$ Metabolism is a defining feature of all living organisms. All living organisms are made of chemicals,which are constantly being made and changed into some other biomolecules. These conversions are chemical or metabolic reactions.
$\Rightarrow$ All plants,animals,fungi,and microbes exhibit metabolism.
$\Rightarrow$ Metabolism is the sum total of all chemical reactions occurring in our body.
$\Rightarrow$ Cellular organization of the body is the defining feature of life forms.

(N/A)

Anabolism	Catabolism
$(1)$ It is the sum total of constructive processes.	$(1)$ It is the sum total of destructive processes.
$(2)$ Complex substances are formed from simpler ones.	$(2)$ Simpler substances are formed from complex ones.
$(3)$ Energy is stored.	$(3)$ Energy is released.
$(4)$ Anabolism is required for growth and maintenance.	$(4)$ Catabolism is required for the performance of activities.

(N/A) $(i)$ Entropy: $A$ measure of the degree of disorder or randomness in a system is called Entropy.
$(ii)$ Metabolism: The sum total of all chemical reactions occurring in a living organism is called metabolism. It involves a constant alternation of building up processes (anabolism) and breaking down processes (catabolism),which enable organisms to grow,reproduce,and maintain their structure.

(N/A) $\rightarrow$ All living organisms (bacteria,protozoa,plants,animals) contain thousands of organic compounds.
$\rightarrow$ These compounds or biomolecules are present in certain concentrations (mols/cell or mols/litre,etc.).
$\rightarrow$ These biomolecules have a turnover; they are constantly being changed into other biomolecules and are also synthesized from other biomolecules.
$\rightarrow$ In living organisms,the breaking and making of bonds through chemical reactions occur constantly. Collectively,all these chemical reactions are called metabolism.
$(i)$ Examples of such metabolic transformations include the removal of $CO_2$ from amino acids to transform them into amines.
$(ii)$ Removal of an amino group in a nucleotide base,or the hydrolysis of a glycosidic bond in a disaccharide.
$\rightarrow$ The majority of these metabolic reactions do not occur in isolation but are linked to other reactions.
$\rightarrow$ Metabolites are converted into each other in a series of linked reactions called metabolic pathways.
$\rightarrow$ These metabolic pathways are similar to automobile traffic; they have a definite rate and direction.
$\rightarrow$ This metabolite flow is called the dynamic state of body constituents,which is necessary for maintaining healthy conditions.
$\rightarrow$ Another feature of metabolic reactions is that every chemical reaction is a catalysed reaction. There is no metabolic conversion in living systems that is uncatalysed. Even the dissolving of $CO_2$ in water,a physical process,is a catalysed reaction in living systems.
$\rightarrow$ The catalysts that speed up the rate of a given metabolic conversion are proteins,known as enzymes.

(N/A) $\rightarrow$ Chemical compounds undergo two types of changes:
$(1)$ Physical change: Change in shape or state of matter without breaking of chemical bonds. For example,ice melting into water or water becoming vapour.
$(2)$ Chemical change: When bonds are broken and new bonds are formed during transformation,it is called a chemical reaction. For example,$Ba(OH)_{2} + H_{2}SO_{4} \rightarrow BaSO_{4} + 2H_{2}O$ (inorganic) or hydrolysis of starch into glucose (organic).
$\rightarrow$ Rate of a process refers to the amount of product formed per unit time. $\text{Rate} = \frac{\delta p}{\delta t}$.
$\rightarrow$ Rates are influenced by temperature; a rule of thumb is that the rate doubles or decreases by half for every $10^{\circ}C$ change.
$\rightarrow$ Catalysed reactions proceed much faster. For example,the enzyme carbonic anhydrase increases the rate of $CO_{2} + H_{2}O \rightarrow H_{2}CO_{3}$ by about $10$ million times.
$\rightarrow$ $A$ metabolic pathway is a multistep chemical reaction where each step is catalysed by specific enzymes. For example,the conversion of glucose to pyruvic acid involves $10$ different enzyme-catalysed reactions.

(B) $\rightarrow$ Thousands of chemical reactions occur simultaneously inside all living organisms.
$\rightarrow$ These reactions involve the constant synthesis of new biomolecules and the conversion of existing ones into other forms.
$\rightarrow$ The sum total of all these chemical reactions occurring in a living organism is known as metabolic reactions.

(A) The sum total of all chemical reactions occurring in a living organism is known as $Metabolism$. $Metabolism$ consists of two types of reactions: $Anabolism$ (constructive or building-up processes) and $Catabolism$ (destructive or breakdown processes). Since the question refers to both formation and breakdown, the collective term is $Metabolism$.

(D) Metabolism is the sum total of all chemical reactions occurring in a living organism.
All living organisms,including plants,animals,fungi,and microbes,exhibit metabolism.
Isolated metabolic reactions performed in a test tube $(in-vitro)$ are not considered living things themselves,but they are indeed living reactions because they follow the same biochemical pathways as those inside a cell.

(A) Catabolism is the breakdown of substances,e.g.,Respiration.
Anabolism is the formation of substances,e.g.,Photosynthesis.
Catabolism $+$ Anabolism $=$ Metabolism.
These are defining features of all life forms.
Simultaneous catabolism and anabolism are called Amphibolism.

(B) The glyoxylate cycle is a metabolic pathway that allows organisms to convert fatty acids into carbohydrates. This cycle requires two specific enzymes: isocitrate lyase and malate synthase. Animals lack these specific enzymes,which is why they cannot perform the glyoxylate cycle to synthesize glucose from fats.

(D) The Pentose Phosphate Pathway $(PPP)$,also known as the hexose monophosphate shunt,occurs in the cytosol (cytoplasm) of the cell. However,in photosynthetic organisms,specific reactions of the $PPP$ or related pathways occur in the chloroplast. In certain specialized tissues like glyoxysomes and mitochondria,related oxidative processes occur. Given the options provided,the pathway is primarily cytosolic,but in the context of plant physiology and metabolic compartmentalization,it is associated with the chloroplast,glyoxysome,and mitochondrion for various metabolic requirements.

(B) Metabolism consists of two types of processes: Anabolism and Catabolism.
Anabolism refers to the constructive or synthesis processes in an organism where complex molecules are formed from simpler ones.
Catabolism refers to the destructive or breakdown processes where complex molecules are broken down into simpler ones.
Therefore,the synthesis process is known as Anabolism.

(A) The breakdown process within a living organism is known as catabolism. Catabolic pathways involve the degradation of complex molecules into simpler ones,which releases energy.

(B) The synthesis of glucose from non-carbohydrate sources,such as amino acids,proteins,fatty acids,and glycerol,is called gluconeogenesis.
This process occurs primarily in the liver when the body's glycogen stores are exhausted to maintain blood glucose levels.
Glycogenesis is the process of converting glucose into glycogen for storage.
Glycogenolysis is the breakdown of glycogen into glucose.
Glycolysis is the breakdown of glucose into pyruvate to produce energy.

(A) The process of resynthesis of food materials from simpler food molecules is called biosynthesis.
Absorption is the process by which digested nutrients are absorbed through the wall of the gut into the blood.
Assimilation is the process of conversion of absorbed food into active cytoplasm or its utilization for energy and growth within the cell.

(N/A) $\rightarrow$ Metabolism is the sum total of all chemical reactions occurring within a living organism.
$\rightarrow$ It consists of two types of processes:
$1$. Anabolism: These are constructive or building-up reactions,such as photosynthesis,where complex molecules are synthesized from simpler ones.
$2$. Catabolism: These are destructive or breakdown reactions,such as respiration,where complex molecules are broken down into simpler ones to release energy.

(B) Metabolism consists of two types of pathways: Anabolism and Catabolism.
$1$. Anabolism (Biosynthetic pathway): This is the process of constructing complex molecules from simpler ones. It requires energy. Therefore,$P$ is Anabolism.
$2$. Catabolism (Degradative pathway): This is the process of breaking down complex molecules into simpler ones. It releases energy. Therefore,$Q$ is Catabolism.
Thus,$P$ is Anabolism and $Q$ is Catabolism.

(D) Metabolism is the sum total of all chemical reactions occurring in a living organism.
$1$. Non-living objects do not show metabolism because they lack the organized cellular structure required for these reactions.
$2$. All living organisms,from unicellular to multicellular,exhibit metabolism.
$3$. Metabolic reactions can be performed in a cell-free system (in vitro) in a laboratory,such as in a test tube. While these are not 'living things' themselves,they are 'living reactions'.
Therefore,all the given statements are correct.

(A) Metabolism is the sum total of all chemical reactions occurring in a living organism. It is divided into two types:
$1$. Anabolism: The process of synthesizing complex molecules from simpler ones (e.g.,protein synthesis from amino acids). This process requires energy.
$2$. Catabolism: The process of breaking down complex molecules into simpler ones (e.g.,respiration). This process releases energy.
Therefore,the formation of large molecules from small molecules is known as Anabolism.

(B) The metabolic reactions in a cell are of two types: $1$. Anabolism (or biosynthetic pathways) which involves the formation of complex molecules from simpler ones. $2$. Catabolism (or degradation pathways) which involves the breakdown of complex molecules into simpler ones. Since the question asks about the process of breaking down large molecules into smaller ones,it is known as Catabolism.

(B) The transformation of biomolecules into one another occurs through a series of linked chemical reactions,which are collectively known as metabolic pathways.
These pathways can be either linear or circular.
Each step in a metabolic pathway is catalyzed by a specific enzyme.
Therefore,the correct term for a series of linked reactions is a metabolic pathway.

(D) The living state is a non-equilibrium steady state to be able to perform work. Living organisms are constantly working to prevent reaching equilibrium. The flow of metabolites through metabolic pathways has a definite rate and direction. This metabolite flow is known as the dynamic state of body constituents.

(A) Metabolism is the sum total of all chemical reactions occurring in a living organism. It is divided into two types:
$1$. Anabolism: These are biosynthetic pathways where complex molecules are formed from simpler ones. These processes require energy,hence they are endergonic.
$2$. Catabolism: These are degradative pathways where complex molecules are broken down into simpler ones. These processes release energy,hence they are exergonic.
Therefore,anabolism is an endergonic process,and catabolism is an exergonic process.

(C) In chemistry and biology, a change where the shape or state of a compound is altered without breaking any chemical bonds is known as a $Physical \ change$.
Conversely, a change that involves the breaking of existing chemical bonds or the formation of new chemical bonds is defined as a $Chemical \ change$.
Therefore, $P$ represents a physical change and $Q$ represents a chemical change.

(A) The synthesis of biological molecules (like proteins,lipids,or nucleic acids) requires energy and involves the building up of complex molecules from simpler precursors. This constructive metabolic process is known as an $Anabolic$ process. In contrast,$Catabolic$ processes involve the breakdown of complex molecules into simpler ones,usually releasing energy.