Description : Which of the following processes doesn't account for an increase in atmospheric CO2 (carbon dioxide) levels? w) deforestation x) photosynthetic processes y) plant respiration z) fossil fuel combustion
Last Answer : ANSWER: X -- PHOTOSYNTHETIC PROCESSES
Description : The path of `CO_(2)` in the dark reaction of photosynthetic was successfully traced by the use of the following or The dark reaction is traced by
Last Answer : The path of `CO_(2)` in the dark reaction of photosynthetic was successfully traced by the use of the following or ... O_(2)` C. `P^(32)` D. X-rays
Description : Select the correct statement: (1) C4 pathway for. CO2 fixation were discovered by Hatch and Slack (2) CO2 is essential for photosynthesis (3) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria (4) Phloem is the principal pathway for translocation of solutes
Last Answer : Ans. ((c))
Description : During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation? (a) Release of O2 (b) Formation of ATP (c) Formation of NADPH (d) Involvement of PS I and PS II pigment systems
Last Answer : (b) Formation of ATP
Description : In light reaction, plastoquinone facilitates the transfer of electrons from (a) PS-II to Cytb6f complex (b) Cytb6f complex to PS-I (c) PS-I to NADP+ (d) PS-I to ATP synthase.
Last Answer : (a) PS-II to Cytb6f complex
Description : Dark reactions of photosynthesis occur in (a) granal thylakoid membranes (b) stromal lamella membranes (c) stroma outside photosynthetic lamellae (d) periplastidial space.
Last Answer : c) stroma outside photosynthetic lamellae
Description : In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm, hence is called (A)____ while in PS II it has absorption maxima at 680 nm
Last Answer : In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm, hence is called (A) ... absorption maxima at 680 nm and is called (B)____
Description : Ferredoxin is a constituent of (a) PS I (b) PS II (c) Hill reaction (d) P680.
Last Answer : (a) PS I
Description : Who demonstrate that photosynthesis is light dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carboh
Last Answer : Who demonstrate that photosynthesis is light dependent reaction in which hydrogen from a suitable ... comes from water nor from carbon dioxide.
Description : Spurious tuples may occur due to i. Bad normalization ii. Theta joins iii. Updating tables from join a) i& ii b) ii & iii c) i& iii d) ii & iii
Last Answer : a) i& ii b) ii & iii
Description : Photosynthetic inhibition by 02 is called: (A) Reaction (B) Warburg’s effect (C) Back inhibition (D) Competitive effect
Last Answer : (B) Warburg’s effect
Description : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II is mostly found in the appressed part of granum.
Last Answer : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II ... false. D. If both Assertion and Reason are false.
Description : Primary electron acceptor of PS-II is
Last Answer : Primary electron acceptor of PS-II is A. Pheophytin B. Ferredoxin C. PQ D. PC
Description : PS II is found in
Last Answer : PS II is found in A. Stacked part of granum B. Non-stacked part of granum C. Stroma thylakoid D. Stroma
Description : `P_(680)` is calld PS II ! C-4 plants hav photorespiration.
Last Answer : `P_(680)` is calld PS II ! C-4 plants hav photorespiration. A. If both As and R are correct and R is ... , R is wrong D. If both As and R are wrong.
Description : NADP+ is reduced to NADPH in (a) PS I (b) PS II (c) Calvin cycle (d) noncyclic photophosphorylation.
Last Answer : (d) noncyclic photophosphorylation.
Description : Which pigment system is inactivated in red drop? (a) PS-I and PS-II (b) PS-I (c) PS-II (d) None of these
Last Answer : (c) PS-II
Description : Maximum photosynthetic activity occurs in - (1) blue and red region of light (2) green and yellow region of light (3) blue and orange region of light (4) violet and orange region of light
Last Answer : (1) blue and red region of light Explanation: Wavelength of light between 400 nm and 700 nm is most effective for photosynthesis. This light is called photo synthetically active radiation (PAR). ... in red and minimum in blue region. In both these regions light is absorbed by chlorophylls.
Description : Plants adapted to low light intensity have (a) larger photosynthetic unit size than the sun plants (b) higher rate of CO2 fixation than the sun plants (c) more extended root system (d) leaves modified to spines.
Last Answer : (a) larger photosynthetic unit size than the sun plants
Description : Maximum photosynthetic activity occurs in : (1) blue and red region of light (2) green and yellow region of light (3) blue and orange region of light (4) violet and orange region of light
Last Answer : blue and red region of light
Description : The 5- carbon compounds produced during dark reaction of photosynthesis is (A) Ribose phosphate (B) Xylulose phosphate (C) Ribulose bis phosphate (D) Seda heptulose phosphate
Last Answer : (C) Ribulose bis phosphate
Description : The maximum possible chain length of fatty acids formed in the pathway of de novo synthesis is (A) 16 Carbon atoms (B) 18 Carbon atoms (C) 20 Carbon atoms (D) 24 Carbon atoms
Last Answer : Answer : A
Description : When acetate is the sole source of carbon for some microorganisms, the cycle which is used, is called A.pentose phosphate pathway B.glycolyic pathway C.glyoxylate pathway D.oxaloacetate pathway
Last Answer : C.glyoxylate pathway
Description : when a carbonate reacts with an acid,it produces carbon dioxide gas. how can this reaction be used in our dairy life -Biology
Last Answer : answer:
Description : Is the correct equation for the reaction below. One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon-dioxide gas and four molecules of water vapor?
Last Answer : Yes, it is correct.C3H8 + 5 O2 = 3 CO2 + 4 H2O
Description : What are the consequences of shifting the chemical equilibrium of the formation of bicarbonate from carbon dioxide and water towards the consumption of products of the reverse reaction?
Last Answer : The shifting of the chemical equilibrium of the formation of bicarbonate from carbon dioxide and water into the reverse reaction (production of water and carbon dioxide) means spending of hydrogen ions and thus it increases the solution pH.
Description : What is the chemical equation of the formation of bicarbonate from carbon dioxide and water? What is the enzyme that catalyzes this reaction?
Last Answer : The chemical equation of the chemical equilibrium of the formation of bicarbonate having as reagents carbon dioxide and water is as follows: CO2 + H20 --> H2CO3 --> H+ + HCO3- The reaction is catalyzed by the enzyme carbonic anhydrase present in red blood cells.
Description : In an acid base reaction which product is produced along with a salt? (1) Hydrogen gas (2) Oxygen gas (3) Carbon dioxide (4) Water
Last Answer : (4) Water Explanation: When an acid and a base are placed together, they read to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
Description : Absorption with chemical reaction' is involved in the removal of (A) Carbon dioxide from gaseous stream using alkaline solution (B) Benzol from coke oven gas using solar oil/wash oil (C) Ammonia ... gas using refrigerated water (D) Tar from coke oven gas in primary gas coolers using chilled water
Last Answer : (A) Carbon dioxide from gaseous stream using alkaline solution
Description : An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is: (A) 9.21 (B) 4.605 (C) 100 (D) 0.001
Last Answer : (B) 4.605
Description : Ultraviolet radiations from sunlight causes a reaction that produces (a) fluorides (b) carbon monoxide (c) sulphur dioxide (d) ozone.
Last Answer : (d) ozone.
Description : How carbon monoxide, emitted by automobiles, prevents transport of oxygen in the body tissues? (a) By forming a stable compound with haemoglobin (b) By obstructing the reaction of oxygen with haemoglobin (c) By changing oxygen into carbon dioxide (d) By destroying the haemoglobin
Last Answer : (a) By forming a stable compound with haemoglobin
Description : The Classical example of redox reaction is Combustion of fossil fuel. During combustion of fossil fuels, the carbon compound in the fossil fuel reacts with oxygen in the presence of a heat source to ... to react with oxygen, so the energy used in portion of combustion is an endothermic reaction.
Last Answer : Combustion of fossil fuel
Description : Silver acetate reacts with Br2 to form methyl bromide, carbon dioxide, and AgBr. This is an example of (a) Wurtz reaction (b) Etard's reaction (c) Hunsdiecker reaction (d) Perkin reaction
Last Answer : Hunsdiecker reaction
Description : The breakdown of pyruvate to give carbon dioxide, water and energy takes place in (i) cytoplasm (ii) mitochondria (iii) chloroplast (iv) nucleus -Biology
Last Answer : The break down of pyruvate to give carbon dioxide, energy and water takes place in the presence of oxygen and is termed as aerobic respiration. This process takes place in the mitochondria of a cell.
Description : The autotrophic mode of nutrition requires (i) carbon dioxide and water (ii) chlorophyll (iii) sunlight (iv) all of the above -Biology
Last Answer : Autotrophic nutrition is the mode of nutrition in which green plants prepare their own food by the process of photosynthesis. It requires carbon dioxide, water, sunlight and chlorophyll. Hence, option (iv) is correct.
Description : i) Write a balanced chemical equation for process of photosynthesis. (ii)When do desert plants take up carbon dioxide and perform photosynthesis? -Chemistry
Last Answer : Answer. (ii) In desert plants the stomata are open at night. They take CO2 at night and is stored in the form of acid and is used during day time for photosynthesis.
Description : (i) Write the balanced chemical equation for the process of photosynthesis, (ii) When do the desert plants take up carbon dioxide and perform photosynthesis ? -Biology
Last Answer : (i) Photosynthesis can be represented using a chemical equation. The overall balanced equation is (ii) Desert plants open up their stomata during night and take in CO2. Stomata remains close during the ... cells until the sun comes out and they can carry on with photosynthesis during the day time.
Description : Oxygen liberated during photosynthesis is coming from : (1) Carbon dioxide (2) Water (3) Bresk down of chlorophy II (4) Atmosphere
Last Answer : (2) Water Explanation: Oxygen liberated during photosynthesis is coming m6t.o create a stable, unstirred layer to support surface neutralization of acid and act as a protective physical barrier against luminal pepsin.
Last Answer : Water
Description : Consider the pathway of a well known organic reaction Which step is rate determining step?
Last Answer : Consider the pathway of a well known organic reaction Which step is rate determining step? A. Formation ... III C. Formaton of V D. Formation of IV
Description : An allosteric enzyme is generally inhibited by (A) Initial substrate of the pathway (B) Substrate analogues (C) Product of the reaction catalysed by allosteric enzyme (D) Product of the pathway
Last Answer : Answer : D
Description : The rate limiting reaction in the lipogenic pathway is (A) Acetyl-CoA carboxylase step (B) Ketoacyl synthase step (C) Ketoacyl reductase step (D) Hydratase step
Description : The pathway of glycogen biosynthesis involves a special nucleotide of glucose. In the reaction below, NuDP stands for NuDP Glucose + glycogenn → NuDP + glycogenn+1 (A) ADP (B) GDP (C) UDP (D) CDP
Last Answer : Answer : C
Description : The reaction catalysed by phosphofructokinase (A) Is activated by high concentrations of ATP and citrate (B) Uses fruitose-1-phosphate as substrate (C) Is the rate-limiting reaction of the glycolytic pathway (D) Is inhibited by fructose 2, 6-bisphosphate
Last Answer : C
Description : In the metabolic pathway, ABCDE, discuss what effect molecule E would likely have on regulating the enzyme that catalyzes the reaction of A to B?
Last Answer : E is the product. If there is enough of molecule E to complete a chemical process, for example, the molecules (reactants) ABCDE will not be needed, and therefore an excess of E means less of ABCDE produced.
Description : What happens when a catalyst is added to a system at equilibrium? A The reaction follows an alternative pathway of lower activation energy. B The heat of reaction decreases. C The potential ... decreases. D The potential energy of the products decreases. E The rate of chemical reaction decreases.
Last Answer : A The reaction follows an alternative pathway of lower activation energy.
Description : Leishmania donovani is susceptible to certain antifungal drugs because both fungi and Leishmania: A. Utilise purine salvage pathway B. Utilise similar glycolytic mechanisms C. Have similar topoisomerase II enzyme D. Have ergosterol in their cell membranes
Last Answer : D. Have ergosterol in their cell membranes