Description : Which of the following statement(s) is/are true concerning protein/amino acid metabolism in man? a. The major source of amino acids is breakdown of circulating proteins b. The recommended daily ... balance refers to a decrease in nitrogen taken into the body versus the amount of nitrogen lost
Last Answer : Answer: b, d About 15% of the total body weight is made up of proteins, about half of which are intracellular and half extracellular. In man and other animals, dietary protein is the source of ... is exceeded by the amount of nitrogen lost in the urine, stool, skin, wounds, and fistula drainage
Description : What happens when a chemical bond is formed? (1) energy is always absorbed (2) energy in always released (3) more energy is released than is absorbed (4) energy is neither released nor ... as potential energy. Upon the breaking of these bonds the energy is released thereby creating usable energy.
Last Answer : Silver nitrate solution is kept in brown bottles in laboratory because - (1) it reacts with ordinary white bottles (2) brown bottles stops the passage of light through it (3) brown bottles do not react with it (4) brown bottles react with it
Description : Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is __________ hybridized and the CNC bond angle is __________. (a) sp2; >109.5° (b) sp2; 109.5° (d) sp3;
Last Answer : sp3;
Description : In a nucleotide, the nitrogen base is joined to the sugar molecule by a) Phosphodiester bond b) Glycosidic bond c) Hydrogen bond d) (a) &(b)
Last Answer : b) Glycosidic bond
Description : Which describes the bond strength or bond dissociation energy? (a) energy required to break a bond (b) energy released when a bond breaks (c) energy released when a bond is formed (d) (a) and (c)
Last Answer : (a) and (c)
Description : From two amino acids peptide bond formation involves removal of one molecule of (A) Water (B) Ammonia (C) Carbondioxide (D) Carboxylic acid
Last Answer : Answer : A
Description : In a protein molecule the disulphide bond is not broken by (A) Reduction (B) Oxidation (C) Denaturation (D) X-ray diffraction
Last Answer : Answer : C
Description : In water molecule the bond angle decreases from 109.28 to 104.5, why this does happens ?
Last Answer : The repulsion between lone pair and lone pair electrons In NH3 molecule, the bond angle decreases from 109.28 to 107.3 why does it happen. The more repulsion between lone pair and bond pair
Description : How many total electrons are shared in a triple covalent bond?
Last Answer : 4 :)
Description : How many sigma and pi bonds are there in a triple bond?
Last Answer : 1 sigma, 2 pi bonds in a triple bond.
Description : Why are covalent compounds poor conductors of electricity? (1) Due to the presence of charged particles. (2) Due to the absence of charged particles. (3) Due to the presence of a triple bond. (4) None of the above
Last Answer : (2) Due to the absence of charged particles. Explanation: In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
Description : Unsaturated hydrocarbons with triple bond?
Last Answer : Alkynes
Description : The unsaturated hydrocarbons having one triple bond between carbon atoms are
Last Answer : alkynes.
Description : Classify the following compounds containing double bond and triple bond – Ethyne, benzene, Butyne, pentene
Last Answer : Double bond: Benzene, pentene Triple bond: Ethyne, Butyne
Description : Which of the following describes a triple bond? (a) two sigma bonds and two pi bonds (b) one sigma bond and one pi bond (c) two sigma bonds and one pi bond (d) one sigma bond and two pi bonds
Last Answer : one sigma bond and two pi bonds
Description : How many electrons are involved in a carbon-carbon triple bond? (a) 1 (b) 2 (c) 3 (d) 6
Last Answer : 6
Description : The bond angles associated with the hybrid orbitals of a carbon involved in a triple bond is (a) 180° (b) 120° (c) 109° (d) 45
Last Answer : 180
Description : A triple bond consists of (a) 2 sigma bonds and 1 pi bond (b) 3 sigma bonds (c) 1 sigma bond and 2 pi bonds (d) 3 pi bonds
Last Answer : 1 sigma bond and 2 pi bonds
Description : The carbon-carbon bond lengths in rank of increasing bond length is : (a) triple, double, single (b) single, double, triple (c) single, triple, double (d) triple, single, double
Last Answer : triple, double, single
Description : Catenation is a property of the carbon atom which describes its ability to (a) bond with other carbon atoms (b) form double and triple bonds (c) exist in plant and animal form (d) form bonds in its ground state
Last Answer : bond with other carbon atoms
Description : A triple bond consists of how many pi bonds and how many sigma bonds?
Last Answer : ANSWER: ONE SIGMA BOND AND TWO PI BONDS
Description : A triple bond consists of: w) three sigma bonds x) three pi bonds y) two sigma bonds and one pi bond z) one sigma bond and two pi bonds
Last Answer : ANSWER: Z -- ONE SIGMA BOND AND TWO PI BONDS
Description : Hydrocarbons that contain a triple bond between carbon atoms are known as: w) alkenes x) alkanes y) alkynes z) polymers
Last Answer : ANSWER: Y -- ALKYNES
Description : The triple bond between the carbon atoms causes acetylene, C2H2, to have which of the following shapes? w) trigonal planar (pron: try-gon-al) x) linear y) tetrahedral z) trigonal bipyramidal
Last Answer : ANSWER: X -- LINEAR
Description : Ionic compounds have high melting and boiling points because A) less energy is required to break the strong interionic attraction B) large amount of energy is required to break the interionic attraction C) No energy is required D) None of the above
Last Answer : B) large amount of energy is required to break the interionic attraction
Description : For conversion of oxaloacetate to phosphoenol pyruvate, high energy molecule is required in the form of (A) GTP only (B) ITP only (C) GTP (or) ITP (D) None of these
Last Answer : C
Description : A molecule of CO2 is captured by biotin when it acts as coenzyme for carboxylation reaction. The carboxyl group is covalently attached to (A) A nitrogen (N1) of the biotin molecule (B) Sulphur of thiophene ring (C) α-Amino group of lysine (D) α-Amino group of protein
Description : How many high-energy phosphate bond equivalents are required for amino acid activation in protein synthesis? (A) One (B) Two (C) Three (D) Four
Last Answer : Answer : B
Description : A DNA with unequal nitrogen bases would most probably be (a) single stranded (b) double stranded (c) triple stranded (d) four stranded
Last Answer : (a) single stranded
Description : Bond energy of a molecule :
Last Answer : Bond energy of a molecule : A. Is always negative B. Is always positive C. Either positive or ... D. Depends upon the physical state of the system
Description : Which of the following statement(s) is/are true concerning translation of the mRNA message to protein synthesis? a. An adaptor molecule, tRNA, recognizes specific nucleic acid bases and unites them ... and the free amino acid occurs in the free cytoplasm d. Complete protein synthesis takes hours
Last Answer : Answer: a, b The synthesis of protein involves conversion from a four-letter nucleotide language to one of 20 chemically distinct amino acids. This process is referred to as ... translation and be moving down the mRNA molecules simultaneously, thus increasing the rate of protein synthesis
Description : Is the bond energy of all the four C-H bonds in CH4 molecule equal? If not then why ? How is C-H bond energy then reported?
Last Answer : Ans. No because after breaking of C-H bonds one by one, the electronic environments change. The reported value is the average of of the bond dissociation energies of the four C-H bonds.
Description : How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal? (a) 1 (b) 2 (c) 30 (d) 57
Last Answer : d) 57
Description : In the synthesis of 1 molecule of urea in the Kreb’s Hanseleit cycle, the number of ATPs required is (A) 1 (B) 2 (C) 3 (D) 4
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has – (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : (3) stable half filled 2p sub level Explanation: Ionization energy is a measure of the ease in which atoms lose electrons and become positive ions.
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : stable half filled 2p sub level
Description : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A and T there are three H-bond, whereas in between G and
Last Answer : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A ... false. D. If both assertion and reason are false.
Description : Shape of molecule having 4- bond pair and one lone pair is :-
Last Answer : Shape of molecule having 4- bond pair and one lone pair is :- A. Trigonal bipyramidal B. T-shape C. See-saw D. Square planar
Description : The bond angle in `XeF_(2)` molecule is
Last Answer : The bond angle in `XeF_(2)` molecule is A. `120^(@)` B. `109^(@)` C. `180^(@)` D. `90^(@)`
Description : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.
Last Answer : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. ... I is not correct and Statement-II is correct
Description : Name a molecule having banana bond.
Last Answer : Name a molecule having banana bond.
Description : What molecule contains a non-polar covalent bond?
Last Answer : Feel Free to Answer
Description : What kind of bond is formed when the attraction between the hydrogen atom in one water molecule and the oxygen molecule in another?
Description : What is the bond order of a N2+ molecule?
Last Answer : answer is 2
Description : How many hydrogen bond a water molecule can form?
Last Answer : four
Description : In an oxygen molecule, two atoms are united by - (1) one bond (2) two bonds (3) three bonds (4) four bonds
Last Answer : (2) two bonds Explanation: Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule ... is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.