Enzymes are sensitive to (a) Heat (b) pH (c) Poisons (d) All three

Enzymes are sensitive to (a) Heat (b) pH (c) Poisons (d) All three
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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

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

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong? (a) Enzymes require optimum pH for maximal activity. (b) Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80° - 90°C. (c) Enzymes are highly specific. (d) Most enzymes are proteins but some are lipids.

Description : Three of the following statements about enzymes are correct and one is wrong. Which one is wrong? (a) Enzymes require optimum pH for maximal activity. (b) Enzymes are denatured at high temperature but ... - 90°C. (c) Enzymes are highly specific. (d) Most enzymes are proteins but some are lipids.

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Poisons like cyanide inhibit Na+ efflux and K+ influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that (a) ATP is the carrier protein in the transport system (b) energy for Na+-K+ exchange pump comes from ATP (c) ATP is hydrolysed by ATPase to release energy (d) Na+-K+ exchange pump operates in the cell.

Description : Poisons like cyanide inhibit Na+ efflux and K+ influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that (a) ATP is the carrier protein in the ... is hydrolysed by ATPase to release energy (d) Na+-K+ exchange pump operates in the cell.

Last Answer : (b) energy for Na+-K+ exchange pump comes from ATP

Systemic insecticides (A) Are absorbed throughout the plant (B) Kill insects following external bodily contact (C) Are stomach poisons (D) Emit poisonous vapour

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Which of the following is a dimensionless quantity? (a) Shear stress (b) Poison’s ratio (c) Strain (d) Both (b) and (c)

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The value of Poison’s ratio depends upon (a) Nature of load, tensile or compressive (b) Magnitude of load (c) Material of the test specimen (d) Dimensions of the test specimen

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The study of poisons is called: w) oncology x) toxicology y) phrenology z) ergonomics (pron: ur - go - no - mics)

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Last Answer : ANSWER: X -- TOXICOLOGY

Toxicology is related to the study of (1) viruses (2) bacteria (3) diseases (4) poisons

Description : Toxicology is related to the study of (1) viruses (2) bacteria (3) diseases (4) poisons

Last Answer : poisons

Dry seeds endure higher temperature than germinating seeds as (A) Hydration is essential for making enzymes sensitive to temperature (B) Dry seeds have a hard covering (C) Dry seeds have more reserve food (D) Seedlings are tender

Description : Dry seeds endure higher temperature than germinating seeds as (A) Hydration is essential for making enzymes sensitive to temperature (B) Dry seeds have a hard covering (C) Dry seeds have more reserve food (D) Seedlings are tender

Last Answer : Answer : A

Enzymes are(A) Proteins with high molecular weight (around 10,000)(B) Derived from living organisms(C) Catalyst for temperature sensitive reactions(D) All (A), (B) and (C)

Description : Enzymes are (A) Proteins with high molecular weight (around 10,000) (B) Derived from living organisms (C) Catalyst for temperature sensitive reactions (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Which of the following is not true regarding enzymes? (A) They catalyze only a particular type of reaction (B) They remain active even after separation from the source (C) They are destroyed after the completion of the reaction they catalyse (D) They are irreversibly destroyed at high temperature (E) Their activity depends on the pH of the solution

Description : Which of the following is not true regarding enzymes? (A) They catalyze only a particular type of reaction (B) They remain active even after separation from the source (C) They are destroyed ... They are irreversibly destroyed at high temperature (E) Their activity depends on the pH of the solution

Last Answer : Answer : C

Enzymes activity is controlled by (A) pH of the solution (B) Temperature (C) Concentration of the enzyme (D) Concentration of the substrate (E) All of these

Description : Enzymes activity is controlled by (A) pH of the solution (B) Temperature (C) Concentration of the enzyme (D) Concentration of the substrate (E) All of these

Last Answer : Answer : C

If all the enzymes, intermediates and cofactors of the citric acid cycle as well as an excess of the starting substrate acetylCoA are present and functional in an organelle free solution at the appropriate pH, which of the following factors of the citric acid cycle would prove to be rate limiting? (A) Molecular oxygen (B) Half life of enzyme (C) Turnover of intermediates (D) Reduction of cofactors

Description : If all the enzymes, intermediates and cofactors of the citric acid cycle as well as an excess of the starting substrate acetylCoA are present and functional in an organelle free solution at the appropriate ... oxygen (B) Half life of enzyme (C) Turnover of intermediates (D) Reduction of cofactors

Last Answer : Answer : D

The pH optima of most of the enzymes is (A) Between 2 and 4 (B) Between 5 and 9 (C) Between 8 and 12(D) Above 12

Description : The pH optima of most of the enzymes is (A) Between 2 and 4 (B) Between 5 and 9 (C) Between 8 and 12(D) Above 12

Last Answer : Answer : B

Streptomycin sulfate is not absorbed orally because it is (a) Degraded by gastrointestinal enzymes (b) Destroyed by gastric acid (c) Highly ionized at a wide range of pH values (d) Insoluble in water

Description : Streptomycin sulfate is not absorbed orally because it is (a) Degraded by gastrointestinal enzymes (b) Destroyed by gastric acid (c) Highly ionized at a wide range of pH values (d) Insoluble in water

Last Answer : Ans: C

What is the optimum pH of usual enzymes?

Description : What is the optimum pH of usual enzymes?

Last Answer : Usually enzymes have the optimum pH between 6 and 8.

What is common among amylase, rennin and trypsin? (a) These are produced in stomach. (b) These act at a pH lower than 7. (c) These all are proteins. (d) These all are proteolytic enzymes.

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Last Answer : (c) These all are proteins.

Hydrolytic enzymes which act on low pH are called as (a) proteases (b) α-amylases (c) hydrolases (d) peroxidases.

Description : Hydrolytic enzymes which act on low pH are called as (a) proteases (b) α-amylases (c) hydrolases (d) peroxidases.

Last Answer : (a) proteases

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen? (a) The pancreatic enzymes and specially the trypsin and lipase will not work efficiently. (b) The pH of stomach will fall abruptly. (c) Steapsin will be more effective. (d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.

Description : If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen? (a) The pancreatic enzymes and specially the trypsin and lipase will ... more effective. (d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.

Last Answer : (d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.

The catalytic efficiency of two different enzymes can be compared by the (a) formation of the product (b) pH of optimum value (c) Km value (d) molecular size of the enzyme.

Description : The catalytic efficiency of two different enzymes can be compared by the (a) formation of the product (b) pH of optimum value (c) Km value (d) molecular size of the enzyme.

Last Answer : (c) Km value

Which of the following statements about enzymes is wrong? (a) Enzymes are denatured at high temperatures. (b) Enzymes are mostly proteins but some are lipids also. (c) Enzymes are highly specific. (d) Enzymes require optimum pH and temperature for maximum activity

Description : Which of the following statements about enzymes is wrong? (a) Enzymes are denatured at high temperatures. (b) Enzymes are mostly proteins but some are lipids also. (c) Enzymes are highly specific. (d) Enzymes require optimum pH and temperature for maximum activity

Last Answer : (b) Enzymes are mostly proteins but some are lipids also.

Which of the following statements is not correct? (a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum. (b) Lysosomes have numerous hydrolytic enzymes. (c) The hydrolytic enzymes of lysosomes are active under acidic pH. (d) Lysosomes are membrane-bound structures.

Description : Which of the following statements is not correct? (a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum. (b) Lysosomes have numerous hydrolytic enzymes. (c) The hydrolytic enzymes of lysosomes are active under acidic pH. (d) Lysosomes are membrane-bound structures.

Last Answer : (a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum.

Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C(B) Most of the enzyme catalysed reactions involve at least two substrates (C) Enzymes help in increasing the activation energy of the reaction (D) Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Description : Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C ... in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Last Answer : (C) Enzymes help in increasing the activation energy of the reaction

Streptomycin sulfate is not absorbed orally because it is: A. Degraded by gastrointestinal enzymes B. Destroyed by gastric acid C. Highly ionized at a wide range of pH values D. Insoluble in water

Description : Streptomycin sulfate is not absorbed orally because it is: A. Degraded by gastrointestinal enzymes B. Destroyed by gastric acid C. Highly ionized at a wide range of pH values D. Insoluble in water

Last Answer : C. Highly ionized at a wide range of pH values

The ………. prints its output on special heat sensitive paper. -Technology

Description : The ………. prints its output on special heat sensitive paper. -Technology

Last Answer : The thermal printer prints its output on special heat sensitive paper.

Is a granite counter top heat sensitive?

Description : Is a granite counter top heat sensitive?

Last Answer : Granite counter tops aare not sensitive to the heat normally associated with their use in kitchens. A hot pan will not affect them.

Gas thermometers are more sensitive than the liquid thermometers because the gases – (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high specific heat

Description : Gas thermometers are more sensitive than the liquid thermometers because the gases – (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high specific heat

Last Answer : (1) have large coefficient of expansion Explanation: Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the has thermometer is more sensitive than liquid (mercury) thereto-meter.

Gas thermometers are more sensitive than the liquid thermometers because of the gases - (1) have low specific heat (2) have high specific heat (3) have large coefficient of expansion (4) are lighter

Description : Gas thermometers are more sensitive than the liquid thermometers because of the gases - (1) have low specific heat (2) have high specific heat (3) have large coefficient of expansion (4) are lighter

Last Answer : (1) have low specific heat Explanation: Gas thermometers are more sensitive because gas has low specific heat than liquids.

Periodic testing by a shoreside support technician using a special camera which can detect potentially dangerous loose or corroded bus bar and controller connections is termed ______________. A. heat sensitive thermography B. visual pyrotronics C. corrosion electrolysis D. electric vibroanalysis

Description : Periodic testing by a shoreside support technician using a special camera which can detect potentially dangerous loose or corroded bus bar and controller connections is termed ______________. A. heat sensitive thermography B. visual pyrotronics C. corrosion electrolysis D. electric vibroanalysis

Last Answer : Answer: A

To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should _______. A. ground the board B. avoid reversing the polarity of the leads C. isolate sensitive components with heat sinks D. all of the above

Description : To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should _______. A. ground the board B. avoid reversing the polarity of the leads C. isolate sensitive components with heat sinks D. all of the above

Last Answer : Answer: B

Crude oil is subjected to vacuum distillation in the last stage, because (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose (B) Lighter/low boiling products are prone to thermal decomposition (C) High purity products can be obtained thereby (D) None of these

Description : Crude oil is subjected to vacuum distillation in the last stage, because (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose (B) Lighter/low ... prone to thermal decomposition (C) High purity products can be obtained thereby (D) None of these

Last Answer : (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available (B) One of the liquid components is heat sensitive (C) Viscosity of liquid components is very high (D) One of the liquid components has very high affinity towards the solvent

Description : Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available ... very high (D) One of the liquid components has very high affinity towards the solvent

Last Answer : (D) One of the liquid components has very high affinity towards the solvent

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using (A) Liquid extraction (B) Distillation (C) Evaporation (D) Absorption

Description : Heat sensitive materials with very high latent heat of vaporisation may be economically separated using (A) Liquid extraction (B) Distillation (C) Evaporation (D) Absorption

Last Answer : (A) Liquid extraction

Molecular distillation is (A) High temperature distillation (B) For heat-sensitive materials (C) Very low pressure distillation (D) Both (B) and (C)

Description : Molecular distillation is (A) High temperature distillation (B) For heat-sensitive materials (C) Very low pressure distillation (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

High pressure at the bottom of a distillation tower handling heat sensitive materials results in (A) Thermal decomposition of bottoms (B) Increased relative volatility (C) Erosion of the tower (D) Very efficient operation

Description : High pressure at the bottom of a distillation tower handling heat sensitive materials results in (A) Thermal decomposition of bottoms (B) Increased relative volatility (C) Erosion of the tower (D) Very efficient operation

Last Answer : (A) Thermal decomposition of bottoms

When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation. (A) Continuous (B) Steam (C) Azeotropic (D) None of these

Description : When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation. (A) Continuous (B) Steam (C) Azeotropic (D) None of these

Last Answer : (B) Steam

Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer. (A) Indirect tray (B) Spray (C) Freeze (D) None of these

Description : Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer. (A) Indirect tray (B) Spray (C) Freeze (D) None of these

Last Answer : (C) Freeze

Viscous & heat sensitive liquids are concentrated in __________ evaporators. (A) Open pan (B) Long tube (C) Agitated film (D) None of these

Description : Viscous & heat sensitive liquids are concentrated in __________ evaporators. (A) Open pan (B) Long tube (C) Agitated film (D) None of these

Last Answer : (C) Agitated film

The advantage of backward feed multiple effect evaporators over forward feed units is that (A) Heat sensitive material can be handled (B) There is no additional cost of pumping (C) Most concentrated liquid is at highest temperature (D) Equal heat transfer co-efficients exist in various effects

Description : The advantage of backward feed multiple effect evaporators over forward feed units is that (A) Heat sensitive material can be handled (B) There is no additional cost of pumping ... liquid is at highest temperature (D) Equal heat transfer co-efficients exist in various effects

Last Answer : (C) Most concentrated liquid is at highest temperature

Vacuum is generally maintained in the vapour space of an evaporator mainly to (A) Get economical temperature difference by using moderate pressure steam (B) Facilitate forward feeding in multiple effect evaporation (C) Concentrate heat sensitive materials (D) Achieve very high concentration of the final product

Description : Vacuum is generally maintained in the vapour space of an evaporator mainly to (A) Get economical temperature difference by using moderate pressure steam (B) Facilitate forward ... (C) Concentrate heat sensitive materials (D) Achieve very high concentration of the final product

Last Answer : (A) Get economical temperature difference by using moderate pressure steam

Pick out the wrong statement: (A) The capacity of an evaporator is reduced by the boiling point elevation (B) Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger (C) Steam jet ejector is used for vapor compression in a thermal recompression evaporator (D) Heat sensitive materials should be concentrated in high pressure evaporators

Description : Pick out the wrong statement: (A) The capacity of an evaporator is reduced by the boiling point elevation (B) Corrosive liquid is normally passed through the tubes in a ... recompression evaporator (D) Heat sensitive materials should be concentrated in high pressure evaporators

Last Answer : (D) Heat sensitive materials should be concentrated in high pressure evaporators

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator. (A) Long tube (B) Falling film (C) High pressure (D) None of these

Description : Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator. (A) Long tube (B) Falling film (C) High pressure (D) None of these

Last Answer : (B) Falling film