Mix Examples- Biomolecules Questions in English

(C) Vitamin-$K$ is essential for the synthesis of clotting factors in the liver,such as prothrombin and factors $VII$,$IX$,and $X$.
When there is a deficiency of Vitamin-$K$,the blood clotting process is impaired.
Consequently,if an injury occurs,the blood fails to clot efficiently,leading to continuous or prolonged bleeding from the injured site.

(A) The correct pair is Vitamin $E$ - Tocopherol.
Vitamin $E$ is chemically known as Tocopherol.
Vitamin $D$ is Calciferol,not Riboflavin.
Vitamin $B_2$ is Riboflavin,while Vitamin $B_1$ is Thiamine.
Vitamin $A$ is Retinol,not Thiamine.

(C) Vitamin $E$ is known as the anti-sterility vitamin (tocopherol).
It plays a crucial role in maintaining the health of the reproductive system and is essential for normal fertility in many animals.
Deficiency of Vitamin $E$ can lead to reproductive failure or sterility.

(C) Butter,red meat,and eggs are rich sources of saturated fats and dietary cholesterol.
Regular consumption of these foods leads to an increase in the levels of cholesterol in the blood,a condition known as Hypercholesterolemia.
High levels of cholesterol are a major risk factor for cardiovascular diseases such as atherosclerosis.

(C) The correct answer is $C$ (Dextrin).
$Keratin$, $Elastin$, and $Collagen$ are all types of structural proteins found in animals.
$Keratin$ is found in hair, nails, and skin.
$Elastin$ provides elasticity to tissues.
$Collagen$ is the most abundant protein in the animal kingdom, providing structural support to connective tissues.
$Dextrin$, on the other hand, is a carbohydrate (a polysaccharide) formed by the hydrolysis of starch, not a protein.

(A) Organisms that can synthesize all their essential nutrients (such as amino acids,vitamins,and nucleotides) from simple inorganic sources are known as $Prototrophs$.
These organisms are considered 'wild-type' because they do not require any specific growth supplements in their culture medium to survive and reproduce.
In contrast,$Auxotrophs$ are mutants that have lost the ability to synthesize one or more essential compounds and thus require specific growth supplements.

(B) $\beta$-carotene is a carotenoid pigment found in plants. It acts as a provitamin or precursor to vitamin $A$. In the human body,it is converted into retinol (vitamin $A$) through enzymatic processes in the intestinal mucosa and liver. Therefore,it is not vitamin $A$ itself but a substance that the body uses to synthesize vitamin $A$.

(C) Vitamins are classified into two categories based on their solubility: water-soluble and fat-soluble.
Water-soluble vitamins include Vitamin $B$ complex and Vitamin $C$.
Fat-soluble vitamins include Vitamin $A$,Vitamin $D$,Vitamin $E$,and Vitamin $K$.
These vitamins are stored in the liver and adipose tissues of the body.
Therefore,the correct group of fat-soluble vitamins is $A, D, E, K$.

(C) Vitamins are essential organic compounds required in small quantities for normal metabolic functions of the body.
Most vitamins cannot be synthesized by animals and must be obtained through the diet.
Therefore,they are classified as organic substances that are generally not synthesized by animals.

(C) Folic acid (Vitamin-$B_9$) is essential for the synthesis of $DNA$ and $RNA$ within the body.
It plays a crucial role in the production of red blood cells and is vital for cell division and growth.
$A$ deficiency in folic acid can lead to megaloblastic anemia,as it impairs the process of cell division in rapidly dividing cells.

(A) Vitamins are classified into two categories based on their solubility: fat-soluble and water-soluble.
Fat-soluble vitamins include Vitamin $A$,$D$,$E$,and $K$,which are stored in the liver and adipose tissues.
Water-soluble vitamins include the $B$-complex group and Vitamin $C$.
These vitamins are not stored in the body in large amounts and are excreted through urine,thus requiring regular intake through the diet.

(C) The deficiency of $Niacin$ (Vitamin $B_3$) causes a condition known as $Pellagra$.
$Pellagra$ is clinically characterized by the '$3D$' symptoms: $Dermatitis$ (skin inflammation),$Diarrhea$ (digestive issues),and $Dementia$ (cognitive decline).
If left untreated,it can eventually lead to death.

(D) The deficiency of $Vitamin \ E$ (tocopherol) is primarily associated with reproductive issues in humans and animals,leading to sterility or infertility.
$Vitamin \ C$ deficiency causes Scurvy.
$Vitamin \ B_1$ (thiamine) deficiency causes Beriberi.
$Vitamin \ K$ deficiency leads to delayed blood clotting.

(B) Ascorbic acid is the chemical name for Vitamin $C$.
It is a water-soluble vitamin that acts as an antioxidant and is essential for the synthesis of collagen,neurotransmitters,and carnitine.
Deficiency of Vitamin $C$ leads to a disease known as scurvy.

(D) $1$. Vitamins are classified into two groups based on their solubility: Fat-soluble (Vitamins $A, D, E, K$) and Water-soluble (Vitamins $B$-complex and $C$).
$2$. Vitamin-$A$ (Retinol) is fat-soluble,and its deficiency leads to Night blindness (Nyctalopia).
$3$. Vitamin-$K$ is fat-soluble,and its deficiency leads to delayed blood clotting.
$4$. Beriberi is caused by the deficiency of Vitamin-$B_1$ (Thiamine),which is water-soluble.
$5$. Pellagra is caused by the deficiency of Vitamin-$B_3$ (Niacin),which is water-soluble.
$6$. Therefore,the correct match is Vitamin-$A$,Fat-soluble,Night blindness.

(D) Vitamin $E$ (tocopherol) is a fat-soluble vitamin that functions as a primary antioxidant in the human body.
It protects cell membranes from oxidative damage by neutralizing free radicals.
While Vitamin $A$ and Vitamin $C$ also have antioxidant properties,Vitamin $E$ is specifically recognized for its role in protecting lipid-rich cell membranes from lipid peroxidation.

(B) Vitamin $D$ deficiency causes Rickets in children and Osteomalacia in adults.
Thiamine (Vitamin $B_1$) deficiency leads to Beri-beri.
Niacin (Vitamin $B_3$) deficiency leads to Pellagra.
Vitamin $K$ is essential for blood clotting. Deficiency of Vitamin $K$ leads to delayed blood clotting or hemorrhage,not sterility. Sterility is typically associated with Vitamin $E$ deficiency.
Therefore,the pair Vitamin $K$ - Sterility is incorrectly matched.

(B) Vitamin-$C$ (ascorbic acid) is essential for the synthesis of collagen,which is the most abundant protein in the body and a key component of connective tissues,including skin,tendons,ligaments,and blood vessels. It acts as a cofactor for enzymes involved in the hydroxylation of proline and lysine residues during collagen synthesis. Therefore,it is primarily helpful in the formation and maintenance of connective tissues.

(B) The process of converting glucose into glycogen is known as glycogenesis.
This process primarily occurs in the liver and skeletal muscles.
After conversion,the glycogen is stored in these two sites to be utilized by the body when blood glucose levels drop.

(A) Vitamin $B_{12}$,also known as cobalamin,is a water-soluble vitamin that plays a crucial role in the normal functioning of the brain and nervous system,as well as the formation of red blood cells.
Its chemical structure is unique because it contains a central cobalt ion $(Co^{3+})$ coordinated within a corrin ring system.
Therefore,the mineral present in Vitamin $B_{12}$ is Cobalt $(Co)$.

(D) Living systems are primarily composed of four essential elements: Carbon $(C)$,Hydrogen $(H)$,Oxygen $(O)$,and Nitrogen $(N)$.
These four elements together constitute approximately $99 \%$ of the total mass of living systems.
Therefore,the correct option is $CHON$.

(B) Water has a high specific heat capacity and high latent heat of vaporization. These properties allow water to absorb or release large amounts of heat with minimal changes in its own temperature. This thermal stability protects living organisms from sudden thermal shocks,ensuring a stable internal environment.

(C) Ketone bodies are water-soluble molecules that contain the ketone group produced by the liver from fatty acids during periods of low food intake (fasting),carbohydrate restrictive diets,starvation,or prolonged intense exercise.
There are three primary ketone bodies:
$1$. Acetoacetate (Acetoacetic acid)
$2$. Acetone
$3$. Beta-hydroxybutyric acid
Succinic acid is an intermediate of the Krebs cycle (Citric acid cycle) and is not classified as a ketone body.
Therefore,the correct answer is $C$.

(C) Hormones and enzymes are both chemical messengers or regulators that are required by the body in very small (trace) quantities to perform their specific biological functions.
While enzymes are biological catalysts that speed up chemical reactions and are not consumed in the process,hormones are signaling molecules that regulate physiological processes.
Not all hormones are proteins (some are steroids or amino acid derivatives),and not all enzymes are proteins (ribozymes are $RNA$-based).
Therefore,the most fundamental similarity is that both are effective in minute concentrations.

(D) Mushrooms are biological organisms (fungi) that primarily consist of organic molecules.
$Lipids$,$Proteins$,and $Carbohydrates$ are all carbon-based compounds,which by definition classifies them as organic compounds.
$Water$ $(H_2O)$ is an inorganic compound because it does not contain carbon-hydrogen bonds.
Therefore,$Water$ is the correct answer as it is the only component listed that is not an organic compound.

(B) Assertion $A$ is true because living organisms constantly exchange matter with their environment to acquire essential nutrients,water,and minerals.
Reason $R$ is also true because organisms possess metabolic pathways to synthesize complex organic molecules (like proteins,lipids,and nucleic acids) from simpler precursors.
However,the fact that organisms synthesize their own components does not explain why they must obtain molecules and elements from the environment. These are two independent biological processes: one involves uptake from the environment (nutrition/absorption),and the other involves internal metabolic synthesis. Thus,$R$ is not the correct explanation for $A$.

(B) In biological systems,chemical compounds are classified into organic and inorganic compounds.
Water,mineral salts,and mineral elements are examples of inorganic compounds.
Enzymes are biological catalysts that are primarily composed of proteins.
Since proteins are complex organic macromolecules,enzymes are classified as organic compounds.
Therefore,the correct option is $B$.

(D) Organic compounds are primarily defined as compounds containing carbon atoms covalently bonded to hydrogen,oxygen,nitrogen,or other elements.
$C - C$,$C - H$,and $C - O$ bonds are fundamental to the structure of organic molecules like hydrocarbons,alcohols,and carbohydrates.
While sulfur can be present in organic compounds (e.g.,in amino acids like cysteine or methionine),the specific bond $S - H$ is a functional group (thiol) found in organic chemistry.
However,in the context of basic organic chemistry definitions regarding the backbone and primary functional groups,all these bonds are technically possible in organic compounds.
If the question implies which bond is $NOT$ a characteristic 'backbone' or 'primary' bond compared to the others,or if there is a specific context of a missing option,we must re-evaluate.
Given the standard options,all these bonds $(C-C, C-H, C-O, S-H)$ are found in organic molecules. If this is a multiple-choice question where one must be selected as 'least characteristic' or if there is a typo in the question,typically $S-H$ is the least common in basic introductory organic chemistry compared to the others. However,chemically,all are valid.

(A) In a water molecule $(H_2O)$,the oxygen atom is bonded to two hydrogen atoms.
These bonds are formed by the sharing of electrons between the oxygen and hydrogen atoms.
$A$ bond formed by the sharing of electrons is known as a covalent bond.
Therefore,the atoms within a single water molecule are held together by covalent bonds.
Note: Hydrogen bonds exist between different water molecules,not within a single molecule.

(B) Organic components in living organisms are primarily composed of carbon-based compounds. These include macromolecules and micromolecules such as carbohydrates,proteins,lipids,nucleic acids,enzymes,and hormones. These substances are essential for the structure,function,and regulation of the body's cells and tissues. Therefore,option $B$ provides the most comprehensive list of organic components.

(A) single water molecule $(H_2O)$ consists of one oxygen atom covalently bonded to two hydrogen atoms. Therefore,there are $2$ covalent bonds within the molecule.
Hydrogen bonds are intermolecular forces that occur between different water molecules,not within a single molecule. Thus,the number of hydrogen bonds within a single water molecule is $0$.
Hence,the correct answer is $2, 0$.

(A) The term $pH$ stands for the 'potential of hydrogen' or 'power of hydrogen'.
It is a scale used to specify the acidity or basicity of an aqueous solution.
It is defined as the negative logarithm of the hydrogen ion concentration,expressed as $pH = -log[H^+]$.

(A) In a water molecule $(H_2O)$,the oxygen atom shares electrons with two hydrogen atoms to achieve a stable electron configuration.
This sharing of electron pairs between atoms is known as a covalent bond.
Therefore,the hydrogen and oxygen atoms are held together by covalent bonds.

(C) Water possesses a high $Specific \ Heat$ capacity,which means it requires a large amount of energy to raise its temperature by $1^{\circ}C$. Additionally,it has a high $Latent \ Heat$ of vaporization. These properties allow water to act as a thermal buffer,absorbing or releasing significant amounts of heat from the environment with minimal changes to its own temperature,thereby maintaining homeostasis in living organisms.

(B) The vitamins that contain sulfur as a structural component are Biotin (Vitamin $B_7$) and Thiamine (Vitamin $B_1$).
Biotin contains a thiophene ring fused to an imidazole ring,where sulfur is a key atom.
Thiamine contains a thiazole ring,which also incorporates a sulfur atom in its structure.
Therefore,the correct pair is Biotin-Thiamine.

(A) Water $(H_2O)$ is a polar molecule due to the electronegativity difference between oxygen and hydrogen atoms,which creates a dipole moment.
Because of this polar nature,water can dissolve a wide variety of substances,including ionic compounds and polar covalent molecules,making it an efficient solvent.
Therefore,the polar nature of water is the direct reason why it acts as an efficient solvent.
Thus,both $A$ and $R$ are true,and $R$ is the correct explanation of $A$.

(B) $ATP$ (Adenosine Triphosphate) is known as the energy currency of the cell.
It plays a crucial role in energy exchange because it stores and releases energy through the hydrolysis of its high-energy phosphate bonds.
When $ATP$ is converted to $ADP$ (Adenosine Diphosphate) and inorganic phosphate,a significant amount of energy is released,which is utilized for various metabolic activities in the cell.

(C) In a water molecule $(H_2O)$,the oxygen atom is $sp^3$ hybridized. Due to the presence of two lone pairs of electrons on the oxygen atom,the bond angle is compressed from the ideal tetrahedral angle of $109.5^\circ$ to approximately $104.5^\circ$ (or $104.45^\circ$ in precise measurements) due to lone pair-bond pair repulsion.

(C) The image shows water molecules $(H_2O)$ surrounding ions ($Cl^-$ and $Na^+$).
Water is a polar molecule with a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.
Because of this polarity,water molecules can surround and hydrate ions,effectively dissolving ionic compounds like $NaCl$.
This ability to dissolve a wide variety of substances makes water an 'efficient solvent' or 'universal solvent' in biological systems.

(A) Water molecules $(H_2O)$ are polar in nature due to the electronegativity difference between oxygen and hydrogen atoms.
This polarity leads to the formation of a weak electrostatic attraction between the partially positive hydrogen atom of one water molecule and the partially negative oxygen atom of another water molecule.
This specific type of intermolecular force is known as a $Hydrogen \ bond$.
Peptide bonds are found in proteins,glycosidic bonds in carbohydrates,and ionic bonds in salts.

(C) Water $(H_2O)$ is a chemical substance that is colorless,tasteless,and odorless at room temperature and normal atmospheric pressure. It is the most essential solvent for all living organisms and is a fundamental component of biological systems.

(D) Water acts as a $universal \ solvent$ because of its high polarity and ability to form hydrogen bonds with various solutes. This property allows it to dissolve a wide range of substances, including salts, sugars, and proteins, within the cytoplasm. By keeping these diverse molecules in a dissolved or colloidal state, water ensures the $homogeneity$ of the cytoplasm, which is essential for the smooth functioning of metabolic reactions.

(A) The figure represents a water $(H_2O)$ molecule.
In a water molecule, the bond angle between the two $O-H$ bonds is $104.5^\circ$.
The bond length of the $O-H$ covalent bond is approximately $95.84 \ pm$.
In the provided figure, '$a$' represents the bond length of the $O-H$ bond.
Therefore, the correct value for '$a$' is $95.84 \ pm$.

(B) Water is the most essential component for all living systems. It acts as a universal solvent, provides a medium for biochemical reactions, helps in the transport of nutrients and waste products, and maintains the structural integrity of cells and tissues. Approximately $70-90\%$ of the mass of a living cell consists of water.

(A) Water is the most abundant chemical component in living organisms. In a typical living cell,water accounts for approximately $70\%$ to $90\%$ of the total cellular mass. It acts as a universal solvent and is essential for all metabolic reactions occurring within the cell.

(B) The chemical formula of water is $H_2O$.
This formula indicates that one molecule of water consists of $2$ atoms of Hydrogen $(H)$ and $1$ atom of Oxygen $(O)$.
Therefore,the number of $H$ and $O$ atoms are $2$ and $1$ respectively.

(D) In a water molecule $(H_2O)$,the oxygen atom shares electrons with two hydrogen atoms.
This sharing of electron pairs between atoms results in the formation of a covalent bond.
Specifically,these are polar covalent bonds because oxygen is more electronegative than hydrogen,leading to an unequal sharing of electrons.

(C) Water $(H_2O)$ at normal temperature is a colorless,tasteless,and odorless liquid. It is a universal solvent and is essential for all known forms of life.

(C) In a water molecule $(H_2O)$, oxygen is more electronegative than hydrogen.
Due to the difference in electronegativity, the shared pair of electrons is pulled more towards the oxygen atom.
This results in the oxygen atom acquiring a partial negative charge $(\delta^-)$ and the hydrogen atoms acquiring a partial positive charge $(\delta^+)$.
Therefore, $H$ has a positive charge and $O$ has a negative charge.

(C) Water possesses a property known as $High \ Specific \ Heat$.
This means that water can absorb or release a large amount of heat energy with only a minimal change in its own temperature.
This property is crucial for maintaining stable temperatures in biological systems and the environment,as it acts as a thermal buffer.