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251.	Which of the following is a common feature to all the compounds found in the acid-soluble pool?(a) They all are biomacromolecules(b) They have molecular weights greater than 8000 Dalton(c) They have molecular weights in the range of 18-8000 Dalton(d) They have molecular weights in the range of 18-800 DaltonThis question was addressed to me at a job interview.This interesting question is from Biomacromolecules in portion Biomolecules of Biology – Class 11
Answer» The correct choice is (d) They have MOLECULAR weights in the range of 18-800 Dalton Explanation: All the biomolecules which are found in the ACID-soluble pool have molecular weights in the range of 18-800 Dalton while those biomolecules which are found in acid INSOLUBLE pool have molecular weights GREATER than 10,000 Dalton.

252.	Which of these secondary metabolites is useful for human welfare?(a) Curcumin(b) Abrin(c) Ricin(d) GumsI got this question during a job interview.This interesting question is from Biomolecules in chapter Biomolecules of Biology – Class 11
Answer» Right answer is (a) Curcumin The explanation is: Curcumin is a drug and a secondary METABOLITE. It has anti-inflammatory properties and is mainly FOUND in TURMERIC. Abrin and ricin are toxins while gums are polymeric SUBSTANCES with no role in human WELFARE.

253.	What is the maximum weight of biomolecules?(a) 800 Da(b) 10,000 Da(c) 1000 Da(d) 5000 DaThis question was addressed to me in final exam.This key question is from Biomacromolecules in section Biomolecules of Biology – Class 11
Answer» The correct answer is (c) 1000 Da The best explanation: BIOMOLECULES or micro-molecules have an approximate MOLECULAR WEIGHT between 1 to 1000 Da. THUS, 1000 Da is the maximum weight. Biomacromolecules have a molecular weight GREATER than 10,000 Da.

254.	What is the use of elemental analysis?(a) To add those nutrients in food(b) To find the elemental composition of living tissues(c) To gain confidence(d) To research the unknownThis question was posed to me in an internship interview.This interesting question is from Biomolecules topic in division Biomolecules of Biology – Class 11
Answer» Right choice is (b) To find the elemental composition of LIVING tissues For explanation I would say: Elemental ANALYSIS gives the elemental composition of living tissues in the form of HYDROGEN, oxygen, chlorine, carbon, ETC. while analysis for compounds gives an idea of the KIND of organic and inorganic constituents present in living tissues.

255.	Which nitrogenous base is not found in RNA?(a) Guanine(b) Adenine(c) Thymine(d) CytosineThis question was posed to me in semester exam.This intriguing question comes from Biomolecules topic in portion Biomolecules of Biology – Class 11
Answer» Correct CHOICE is (c) Thymine For explanation I WOULD say: Deoxyribonucleic ACID (DNA) contains the NITROGENOUS bases adenine, guanine, cytosine and thymine. However, ribonucleic acid (RNA) contains the nitrogenous bases adenine, guanine, cytosine and uracil INSTEAD of thymine.

256.	What is done to obtain the inorganic substances from tissue?(a) Acidification(b) Evaporation(c) Complete combustion(d) DilutionI had been asked this question in semester exam.The doubt is from Biomolecules topic in portion Biomolecules of Biology – Class 11
Answer» Right choice is (c) Complete combustion The BEST explanation: In order to obtain inorganic SUBSTANCES from TISSUE, the tissue is first allowed to sit so that the water EVAPORATES. The carbon COMPOUNDS are eliminated. The remaining ash contains inorganic compounds.

257.	Glycerol is also known as ______(a) dihydroxy butane(b) methyl butanol(c) trihydroxy propane(d) 3 propanolThis question was addressed to me in my homework.This intriguing question originated from Biomolecules topic in chapter Biomolecules of Biology – Class 11
Answer» Correct choice is (C) trihydroxy propane Easiest explanation: The FORMULA for glycerol is C3H8O3. It has 3 carbon (C) atoms, 8 hydrogen (H) atoms, and 3 oxygen (O) atoms. each carbon atom is BONDED to an -OH (hydroxyl) GROUP. Glycerol has antimicrobial and antiviral properties.

258.	How can we get a theoretical idea about the molecular formula of a compound?(a) Analytical techniques(b) Chemical treatment(c) Biological treatment(d) CombustionThis question was addressed to me during an internship interview.This intriguing question comes from Biomolecules in section Biomolecules of Biology – Class 11
Answer» Right answer is (a) ANALYTICAL TECHNIQUES For explanation: Techniques defined under analytical chemistry and stoichiometric CALCULATIONS allow US to APPROXIMATELY determine the molecular formula of a compound. It is the easiest and most accurate method out of all the options.

259.	Which among the following does not affect the activity of the enzyme after a particular point?(a) Temperature(b) PH(c) Concentration of substrates(d) Competitive inhibitorThis question was posed to me in an international level competition.Origin of the question is Biomolecules-3 in section Biomolecules of Biology – Class 11
Answer» Right option is (d) Competitive inhibitor For explanation: Temperature, pH, competitive inhibitor, concentration of SUBSTRATES and enzymes are the factors that affect the activity of enzyme. RATE of REACTION increases with the concentration of enzyme and substrate but remains unaffected after a PARTICULAR rate.

260.	Tertiary structure of protein is formed by __________(a) Sulphide linkages between different amino acids(b) Multiple chains of polypeptides held together by hydrogen bonds(c) Peptide linkages between two amino acids(d) Hydrogen bond formed by helical or pleated structureI have been asked this question during an interview.I would like to ask this question from Biomolecules-2 topic in division Biomolecules of Biology – Class 11
Answer» Right option is (a) SULPHIDE linkages between different amino acids To elaborate: Primary structure of protein is formed by peptide linkages between two amino acids. Secondary structure, i.e. α-Helix and β-Sheath, of protein is formed by hydrogen bonds. Tertiary structure of protein is formed by sulphide linkages between different amino acids Quaternary structure is formed when multiple CHAINS of POLYPEPTIDES HELD together by hydrogen bonds.

261.	Which among the following is incorrect about amino acids?(a) There are 20 naturally occurring amino acids(b) All the amino acids are chiral(c) Amino acids are classified as acidic, basic or neutral based on the relative number of amino and carboxylic groups(d) Amino acids are classified as essential amino acids and non-essential based on whether they are synthesized in the body or notThis question was addressed to me in an online interview.I'd like to ask this question from Biomolecules-2 topic in portion Biomolecules of Biology – Class 11
Answer» The correct choice is (b) All the AMINO acids are CHIRAL Easiest explanation: There are 20 naturally occurring amino acids. All the amino acids EXCEPT glycine are chiral. Amino acids are classified as acidic, basic or neutral based on the relative number of amino and CARBOXYLIC groups. Amino acids are classified as essential amino acids and non-essential based on whether they are SYNTHESIZED in the body or not.

262.	Which among the following is incorrect about amino acids?(a) Amino acids are those that contain an amine group and a carboxylic group(b) Base on the position of amino group with respect to the carboxylic group, amino groups are classified as α-, β-, γ-, δ- amino acids(c) Proteins on hydrolysis produce α-, β-, γ-, δ- amino acids(d) Amino acids are usually represented by a three letter symbol or a one letter conventionThis question was posed to me during a job interview.This intriguing question originated from Biomolecules-2 topic in section Biomolecules of Biology – Class 11
Answer» CORRECT answer is (c) Proteins on hydrolysis PRODUCE α-, β-, γ-, δ- amino acids The explanation is: Amino acids are those that CONTAIN an amine group and a carboxylic group. Base on the POSITION of amino group with respect to the carboxylic group, amino groups are classified as α-, β-, γ-, δ- amino acids. Proteins on hydrolysis produce only α-amino acids.

263.	Which among the following is incorrect about fructose and glucose?(a) Fructose is also called as pyranose and it’s a ketose sugar(b) Glucose and fructose can be obtained by hydrolysis of sucrose(c) Both fructose and glucose have the same molecular formula(d) Both of them taste sweetThis question was posed to me in class test.This intriguing question originated from Biomolecules-1 in division Biomolecules of Biology – Class 11
Answer» The correct answer is (a) FRUCTOSE is also CALLED as pyranose and it’s a KETOSE sugar Easy explanation: Fructose is also called as furanose and it’s a ketose sugar. Glucose and fructose can be obtained by hydrolysis of sucrose. Both fructose and glucose have the same molecular formula. Both of them TASTE sweet.

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