Description : Proteins are most complex organic compounds, containing a. Carbon b. Hydrogen c. oxygen and nitrogen d. All of these
Last Answer : All of these
Description : 6. In 1953 S L Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre existing non living organic molecules. The ... -reducing atmosphere. d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
Last Answer : d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
Description : Consider the following statements: 1. The atmosphere of the primitive earth was reducing 2. The primary source of energy for the chemosynthetic reactions on earth that led to the origin of life was the solar energy 3. Liquid water did not ... 1 and 2 (b) 1 and 4 (c) 1, 2, and 3 (d) 1, 3, and 4
Last Answer : Ans:(d)
Description : Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate paper black and B evolved a gas w
Last Answer : Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate ... ` D. `S^(2-), NO_(3)^(-)`
Description : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia acid absorbed in 60 mL of `M/10`
Last Answer : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia ... ` B. `10%` C. `3%` D. `5%`
Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?
Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%
Description : The correct sequence for the manufacture of molecules/organic compounds on the primitive earth is (a) NH3, nucleic acid, protein and carbohydrate (b) protein, carbohydrate, water and nucleic acid (c) NH3, protein, carbohydrate and nucleic acid (d) NH3, water, nucleic acid and protein.
Last Answer : (d) NH3, water, nucleic acid and protein.
Description : Do you think its possible that life could have evolved on other planets; in a similar manner to Earth?
Last Answer : The key word here is “possible”. If it happened once, it is possible it will happen or has happened. No brainer.
Description : which is the correct sequence of events in the origin of life: I. Formation of protobionts II. Synthesis of organic monomers III. Synthesis of organic
Last Answer : which is the correct sequence of events in the origin of life: I. Formation of protobionts II. Synthesis of organic ... II, III, IV D. I, III, II, IV
Description : Which of the following is the correct sequence of events in the origin of life? I. Formation of protobionts II. Synthesis of organic monomers III. Synthesis of organic polymers IV. Formation of DNA-based genetic systems (a) I, II, III, IV (b) I, III, II, IV (c) II, III, I, IV (d) II, III, IV, I
Last Answer : c) II, III, I, IV
Description : Assertion : Organichlorine presticides are organic compounds that have been chlorinated. Reason:Fenitrothion is one of the organochlorine pesticides.
Last Answer : Assertion : Organichlorine presticides are organic compounds that have been chlorinated. Reason:Fenitrothion is ... reason is wrong D. Both are wrong
Description : Who did an experiment to prove that ' The organic compounds were thers of life '?
Last Answer : Who did an experiment to prove that ' The organic compounds were thers of life '? A. Darwing B. Stanley Miller and Harold C. Urey C. Melvin D. Fox
Description : What was the first organism evolved on earth around 4 billion years ago?
Last Answer : Single cell prokaryotes first appeared perhaps 3.8 billion yearsago.
Description : What period was it when all of the major animal phlya on earth today evolved?
Last Answer : What is the answer ?
Description : Which of the following theories of origin of petroleum does not explain the presence of nitrogen & sulphur compounds in crude oil? (A) Modern theory (B) Carbide theory (C) Engler theory (D) All (A), (B) and (C
Last Answer : (B) Carbide theory
Description : A metabolic pathways is a (A) Route taken by chemicals (B) Sequence of enzyme facilitated chemical reactions (C) Route taken by an enzyme from one reaction to another (D) Sequence of origin of organic molecules
Last Answer : Answer : B
Description : (2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a ... essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.
Last Answer : Metal are good conductors, because – (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface
Description : Which of these acids is not organic in origin? (1) Lactic acid (2) Sulphuric acid (3) Citric acid (4) Oxalic acid
Last Answer : Sulphuric acid
Description : Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly ... the hypothesis? What is an example of a discovery that would strengthen it?
Last Answer : Hypothesis to be tested: Vertebrates evolved from echinoderms. Testing material: A newly found protochordate species (i.e., a vertebrate forerunner). Example of weakening observation (that ... shows how science works, beginning with the placement of hypothesis and further observational testing.)
Description : If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by A. Chezy B. Manning C. Bazin D. Kutter
Last Answer : ANS: B
Description : The breakdown of the C-C bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy is called.
Last Answer : The breakdown of the C-C bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy is called.
Description : Which molecule/ion among the following cannot act as a ligand in complex compounds ?
Last Answer : Which molecule/ion among the following cannot act as a ligand in complex compounds ? A. `CH_(4)` B. `CN^(-)` C. `Br^(-)` D. `CO`
Description : (3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of ... mixed with water by way of a complex series of chemical reactions still only partly understood.
Last Answer : Milk is a colloidal system in which: (1) Water is dispersed in fat (2) Fat is dispersed in water (3) Fat and water are dispersed in each other (4) Fat is dissolved
Description : $ The process of synthesis of complex organic molecules from simpler ones, by the living organisms is called Anabolisms. ! Anabolism is always useful
Last Answer : $ The process of synthesis of complex organic molecules from simpler ones, by the living organisms is called ... wrong D. If both As and R are wrong.
Description : In Intermediate COCOMO the mode that represents complex products is referred to as a) Embedded b) Semidetached c) Organic d) Multiplicative e) onolithic.
Last Answer : a) Embedded
Description : Choose the correct statement about severity of side effects to oral iron medication: A. Ferrous salts are better tolerated than ferric salts B. Complex organic salts of iron are better ... better tolerated than tablets D. Tolerability depends on the quantity of elemental iron in the medication
Last Answer : D. Tolerability depends on the quantity of elemental iron in the medication
Description : What is the name of the first organic compound prepared from inorganic compounds ?
Last Answer : The first organic compound made from inorganic compound is called urea.
Last Answer : German Scientist Uhlar 3
Description : During prolonged fastings, in what sequence are the following organic compounds used up by the body ? (a) First carbohydrates, next fats and lastly proteins (b) First fats, next ... carbohydrates, next proteins and lastly lipids (d) First proteins, next lipids and lastly carbohydrates
Last Answer : (a) First carbohydrates, next fats and lastly proteins
Description : A line AB with end point A (2,3) & B (7,8) is to be rotated about origin by 300 inclockwise direction. Determine the coordinates of end points S of rotated line. a.(3.232, 2.598) b.(5.232, 3.598) c.(3.232, 1.298) d.(3.232, 1.598)
Last Answer : d.(3.232, 1.598)
Description : Write the coordinates of a point on x-axis at a distance of 6 units from the origin in the positive direction of x-axis and then justify your answer. -Maths 9th
Last Answer : Solution :- As, any point on x-axis has coordinates (,)x0 where x is the distance from origin, so required coordinates are (6, 0).
Description : A man walks a distance of 3 units from the origin towards the North-East `(N45^0E)` direction.From there, he walks a distance of 4 units towards the N
Last Answer : A man walks a distance of 3 units from the origin towards the North-East `(N45^0E)` direction.From there, he walks ... ^(ipi/4)` D. `(3+4i)e^(ipi/4)`
Description : How do I know what physical states I should use for different organic compounds?
Last Answer : answer:look in the textbook at the states in which the compounds are labelled in example reactions. They are extremely unlikely to be different in an exam. If they are, it will be a A* mark ... will just be mostly intuitive but then, most people never get a feel for organic chemistry hahahah.
Description : What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds? -Chemistry
Last Answer : —CH2— is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds.
Description : What are the important organic compounds present in living organisms? -Biology
Last Answer : All organisms need four types of organic molecules: nucleic acids, proteins, carbohydrates and lipids; life cannot exist if any of these molecules are missing. Nucleic Acids. The nucleic acids are DNA ... acid and ribonucleic acid, respectively. ... Proteins. ... Carbohydrates. ... Lipids.
Description : Form of energy do plants use to synthesize organic compounds? -Biology
Last Answer : answer:
Description : Which is the essential element in all organic compounds? -General Knowledge
Last Answer : The answer is 'Carbon'
Description : By which Carbon and hydrogen are estimated in organic compounds? -Do You Know?
Last Answer : The percentages of carbon and hydrogen in the compound are calculated from the masses of carbon dioxide and water. Estimation of carbon and hydrogen in an organic compound is based on their conversion to CO, and H20 respectively
Description : What are the two differences between organic compounds and inorganic compounds ?
Last Answer : The two differences between organic and inorganic compounds are mentioned below: 1. All organic compounds must have carbon in their molecules. Such as: CH 4, C 2 H 3 OH etc. But molecules of ... On the other hand, due to ionic bonds, the reaction of inorganic compounds is faster. Thank you!
Description : Soap Organic Compounds or Inorganic Compounds ?
Last Answer : Soap is an organic compound because it is derived from organic compounds. Soap is made by adding caustic soda to organic compounds. . .. CH2-OCO-R .. | CH-OCO-R ............................................ ... .... CH2-OH oil or fat + caustic soda --- > soap + glycerol here R = Cn H 2n + 1 n = 12-18
Description : How do you prepare organic compounds urea ?
Last Answer : Scientist Friedrich Volar prepares the organic compound urea by heating the inorganic compound ammonium cyanate. Thanks!
Description : What class of organic compounds is acetylene ?
Last Answer : Acetylene alkyne class organic compounds.
Description : Are organic compounds electrolytic or covalent substances ?
Last Answer : Organic compounds are covalent substances.
Description : What is the reason for the high number of organic compounds ?
Last Answer : The reasons for the high number of organic compounds are: 1) Cation of carbon element 2) Electronegativity and bonding strength of carbon 3) Equivalence of organic compounds
Last Answer : Carbon, Hydrogen By Formed Compounds, That From Originated To compounds Organic Compounds Says.
Description : Assertion: Amount of biodegradable organic matter present in water is measured by BOD of water Reason: During biodegradation of organic compounds. Oxy
Last Answer : Assertion: Amount of biodegradable organic matter present in water is measured by BOD of water Reason: ... but reason is wrong D. both are wrong
Description : Organic compounds sometimes adjust their electronic as well as steric structure to attain stability. Among the following, the compound having highest
Last Answer : Organic compounds sometimes adjust their electronic as well as steric structure to attain stability. Among the following, ... moment is : A. B. C. D.