Description : Fermentation is a process of decomposition of an organic compound by (1) catalysts (2) enzymes (3) carbanions (4) free radicals
Last Answer : (2) enzymes Explanation: Fermentation in food processing typically is the conversion of carbohydrates to alcohols and carbon dioxide or organic acids using yeasts, bacteria, or a combination there ... to lactic acid. Alcoholic fermentation follows the same enzymatic pathway for the first 10 steps.
Description : The mechanism of dehydration of an alcohol to give an ether involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes
Last Answer : Carbonium ions
Description : The mechanism of dehydration of an alcohol to give an alkene involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes
Description : Homolytic fission of C–C bond leads to the formation of : (a) Free radicals (b) Carbonium ions (c) Carbanions (d) None of these
Last Answer : Free radicals
Description : Enzymes are organic catalysts used in the __________ reactions. (A) Chemical (B) Biochemical (C) Photochemical (D) Electrochemical
Last Answer : (B) Biochemical
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : Many microbes can effect the chemical process of (a) Dehydration (b) Decomposition (c) Fermentation (d) Polymerisation
Last Answer : Ans:(c)
Description : Addition polymerisation takes place either by a free radical mechanism or ionic mechanism depending on the reagents used. Free radical polymerisation is catalyzed by __________, which decompose to give free radicals. (A) Organic peroxides (B) Sulphuric acid (C) Hydrofluoric acid (D) None of these
Last Answer : (A) Organic peroxides
Description : Enzymes and catalysts similarities -Biology
Last Answer : answer:
Description : Which is not true about inorganic catalysts and enzymes? (A) They are specific (B) Inorganic catalysts require specific not needed by enzymes (C) They are sensitive to pH (D) They speed up the rate of chemical reaction
Last Answer : Answer : B
Description : Enzymes are different from catalysts in (A) Being proteinaceous (B) Not used up in reaction (C) Functional at high temperature (D) Having high rate of diffusion
Last Answer : Answer : A
Description : Proteinous substances which catalyze biochemical reactions are known as (A) Activators (B) Catalysts (C) Enzymes (D) Hormones
Last Answer : Answer : C
Description : Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in (A) Blood (B) Saliva (C) Intestine (D) Gland
Last Answer : (B) Saliva
Description : Pick out the wrong statement. (A) Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively (B) Protein catalysts are called enzymes (C) The rate ... concentration of reactants at high concentration of enzymes (D) Total sugar content in molasses is about 10%
Last Answer : (D) Total sugar content in molasses is about 10%
Description : What organic molecule function as a catalysts for chemical reactions in living organisms?
Last Answer : They are called enzymes, but there a probably billions of different enzymes. They are built from protein molecules decorated with sugars and sometimes include one or more metal atoms at their "active" site.
Description : Organic catalysts differ from the inorganic catalyst in the sense that the former is (A) Active at cryogenic temperatures only (B) Prohibitively costly (C) Proteinous in nature (D) Active at very high temperature only
Last Answer : (C) Proteinous in nature
Description : Bacterial decomposition of biological material under anaerobic condition is – (1) fermentation (2) fertilization (3) contamination (4) composting
Last Answer : (1) fermentation Explanation: Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler com-pounds in the absence ... carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
Description : Role of biotechnology in the production of food based on ------? A. Decomposition B. Respiration C. Digestion D. Fermentation (Answer) E. None of these
Last Answer : D. Fermentation (Answer)
Description : Bacterial decomposition of biological material under anaerobic condition is (1) fermentation (2) fertilization (3) contamination (4) composting
Last Answer : fermentation
Description : The two enzymes present in yeast that are responsible for the formation of ethylalcohol from molasses in the fermentation process are
Last Answer : The two enzymes present in yeast that are responsible for the formation of ethylalcohol from molasses ... C. Zymase, diastase D. Invertase, maltase
Description : Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of ... a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin
Last Answer : Answer: a, b, c, d The acute-phase response is a series of homeostatic responses of the organism to tissue injury in infection and inflammation. After an inflammatory stimulus occurs, a number ... 30% to 50% of the level before injury. The reason for the decrease in production is poorly understood
Description : Antioxidants help a person maintain good health because they (a) prevent the vitamins deficiency. (b) prevent excessive oxidation of glucose and other carbohydrates. (c) neutralise the free radicals ... metabolism. (d) activate certain genes in the body cells which help delay the ageing process.
Description : The process of decomposition of organic matter is termed as
Last Answer : Ans. Humification
Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid ... pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste
Last Answer : (2) The process occurs at a temperature above 430°C at atmospheric pressure. Explanation: Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the ... . Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant ... high pressure at temperature above 430° C. (4) It is a thermochemical decomposition of organic waste
Last Answer : The process occurs at a temperature above 430°C at atmospheric pressure.
Description : The fruit when kept is open, tastes bitter after 2 hours because of (A) Loss of water from juice (B) Decreased concentration of fructose in juice (C) Fermentation by yeast (D) Contamination by bacterial enzymes
Last Answer : Answer : D
Description : The processing of green tea involves brief heating of the freshly picked leaves. What could be the possible reason/s? 1. To retain green colour of leaves 2. To give it a special flavour 3. To denature leaf enzymes for preventing ... reason/s is/are true? (a) Only 1 (b) 1 and 3 (c) Only 2 (d) Only 3
Last Answer : Ans:(d)
Description : At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. (A) Independent of (B) Directly proportional to (C) Inversely proportional to (D) Proportional to the square of
Last Answer : (A) Independent of
Description : Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF ... (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process
Last Answer : (C) All the alkylation processes use very high temperature (> 1000°C)
Description : What do you understand by the term Dark Fermentation'? (1) It is a method to dispose nu-clear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.
Last Answer : (4) It is a method to produce Hydrogen as a fuel from waste water. Explanation: Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex ... . Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
Description : Production of alcohol from organic compounds by microorganisms is known as (1) Combustion (2) Fermentation (3) Anaerobic: respiration (4) Aerobic respiration
Last Answer : (3) Anaerobic: respiration Explanation: The process of breaking down large molecules into simpler one in the presence of enzyme is called fermentation.
Description : One of the major sources of organic compounds is Natural gas (b) Fermentation (c) Sea water (d) Atmosphere
Last Answer : Natural gas
Description : What do you understand by the term ‘Dark Fermentation’? (1) It is a method to dispose nuclear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.
Last Answer : It is a method to produce Hydrogen as a fuel from waste water.
Description : Production of alcohol from organic compounds by microorganisms is known as (1) Combustion (2) Fermentation (3) Anaerobic respiration (4) Aerobic respiration
Last Answer : Fermentation
Description : Consider the following carbanions : Correct decreasing order of stability is :
Last Answer : Consider the following carbanions : Correct decreasing order of stability is : A. `II gt III gt IV gt I` B. ` ... gt III` D. `I gt II gt III gt IV`
Description : Consider the following carbanions: Correct decreasing order of stability is :
Last Answer : Consider the following carbanions: Correct decreasing order of stability is : A. II gt III gt I gt IV B. III ... II gt III D. I gt II gt III gt IV
Description : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2)`, in order of their decreasing stability
Last Answer : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2 ... (2)bar(C)HgtC_(6)H_(5)bar(C)H_(2)gtbar(C)Cl_(3)`
Description : Which one of the following carbanions is the least stable?
Last Answer : Which one of the following carbanions is the least stable? A. `CH_(3)CH_(2)^(-)` B. `HC-=C^(-)` C. `CH_(3)^(-)` D. `(CH_(3))_(3)barC`
Description : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3)C-C-=bar(C)(II),` `H_(2)C=bar(C)H(III)," "H_(3)C-bar(C)H_(2)(
Last Answer : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3 ... `IIgtIgtIIIgtIV` C. `IVgtIIIgtIIgtI` D. `IgtIIgtIIIgtIV`
Description : The order of stability of carbanions is (a) primary > secondary > tertiary (b) secondary > tertiary > primary (c) tertiary > secondary > primary (d) tertiary > primary > secondary
Last Answer : primary > secondary > tertiary
Description : Are "mines" a fitting metaphor for "free radicals"?
Last Answer : I would think of free radicals as a rusting of the body.
Description : Arrange the following free radicals in increasing order of stability:
Last Answer : Arrange the following free radicals in increasing order of stability:
Description : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical).
Last Answer : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical). A. ... IF (A) is incorrect but (R) is correct.
Description : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV)
Last Answer : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV) ... gt III D. IV gt III gt I gt II
Description : The increasing order of stability of the following free radicals is :
Last Answer : The increasing order of stability of the following free radicals is : A. `(CH_(3))_(2)overset(.)CHlt(CH_(3)) ... (.)Clt(C_(6)H_(5))_(2)overset(.)CH`
Description : Due to the presence of an unpaired electron, free radicals are:
Last Answer : Due to the presence of an unpaired electron, free radicals are: A. chemically reactive B. chemically inactive C. anions D. cations
Description : Which of the following orders regarding relative stability of free radicals is correct?
Last Answer : Which of the following orders regarding relative stability of free radicals is correct? A. `3^(@)lt2^(@)lt1^(@)` B. ... (@)` D. `3^(@)gt2^(@)lt1^(@)`
Description : Which of the following statement(s) is/are true concerning ischemia reperfusion injury? a. During ischemia, ATP degradation results in increased plasma and intracellular levels of ... immunization with antibodies to neutrophil adhesive complex lessen the ischemic/reperfusion microvascular injury
Last Answer : Answer: a, b, c, d During the ischemia and hypoperfusion phase, degradation of ATP stores essential to maintain cell integrity and significant loss of diffusible ... either the neutrophil adhesive complex or the endothelial selectins dramatically lessens ischemia/reperfusion microvascular injury