Description : Thiamidine dimer formation in DNA is caused by - (1) IR-rays (2) X-rays (3) b and g-rays (4) UV-rays
Last Answer : (4) UV-rays Explanation: When cells are exposed to sunlight, radiant energy damage the DNA. For example, ultraviolet irradiation causes covalent bond formation between adjacent thymines on the same strand of ... . This added energy opens up the bond and allows it to react with a neighboring base.
Description : For bactericidal activity,__________ has/have the ability to cause thymine dimer formation. a. X rays b. B ultraviolet light a. Gamma Rays b. Microwaves
Last Answer : b. B ultraviolet light
Description : Thiamidine dimer formation in DNA is caused by (1) IR-rays (2) X-rays (3) b and g-rays (4) UV-rays
Last Answer : UV-rays
Description : What are the signals of the functional group present in ethanoic acid ?
Last Answer : : The active group present in ethanoic acid is the carboxylic acid group (- COOH)
Description : What is Ethanoic Acid ?
Last Answer : It is an organic acid. A 6-10% aqueous solution of vinegar or vinegar is called ethanoic acid.
Description : Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar? (1) Butanoic acid (2) Methanoic acid (3) Ethanoic acid (4) Hexanoic acid
Last Answer : (3) Ethanoic acid Explanation: When ethanol reacts with oxygen it forms a weak acid called ethanoic acid. In an open bottle of beer or wine, the reaction happens naturally in the presence of bacteria, and it is the ethanoic acid that can make beer or wine taste sour.
Description : Ethanoic acid is commonly called - (1) Acetic acid (2) Sulphuric acid (3) Sodium Ethoxide (4) Ethyne
Last Answer : (1) Acetic acid Explanation: Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 58% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles.
Description : Which of the following substance’s smell is similar to Ethanoic acid? (1) Tomatojuice (2) Kerosene (3) Vinegar (4) Lemon
Last Answer : (3) Vinegar Explanation: Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of-vinegar apart from water.
Description : Distinguish between : (i) Acetaldehyde and acetone (ii) Methanoic acid and Ethanoic acid.
Last Answer : (i) Acetaldehyde will give positive tests with Tollen’s reagent and Fehling Solns. whereas acetone will not give these test. (ii) Methanoic acid gives Tollen’s reagent test whereas ethanoic acid does not due to difference in their boiling points.
Description : Which of the following substance’s smell is similar to Ethanoic acid? (1) Tomato juice (2) Kerosene (3) Vinegar (4) Lemon
Last Answer : Vinegar
Last Answer : : Chemical symbol of ethanoic acid CH3COOH
Description : What element is in sulphuric acid hydrochloric acid nitric acid and ethanoic acid?
Last Answer : Hydrogen
Description : What is the common name of ethanoic acid?
Last Answer : Need answer
Description : How many ions in ethanoic acid?
Last Answer : None
Description : Sperm and egg nuclei fuse due to (a) base pairing of their DNA and RNA (b) formation of hydrogen bonds (c) mutual attraction due to differences in electrical charges (d) attraction of their protoplasts.
Last Answer : attraction of their protoplasts
Description : What is the meaning of Dimer ?
Last Answer : A compound consisting of 2 monomers is called a dimer.
Description : `BCl_(3)` does not exist as dimer but `BH_(3)` exist as dimer `(B_(2)H_(6))` because :-
Last Answer : `BCl_(3)` does not exist as dimer but `BH_(3)` exist as dimer `(B_(2)H_(6))` ... hydrogen atoms get fitted between boron aotms. D. None of these
Description : DNA-dependent RNA polymerase is a (A) Monomer (B) Dimer (C) Trimer (D) Tetramer
Last Answer : Answer : D
Description : Ultraviolet light can damage a DNA strand causing (A) Two adjacent purine residue to form a covalently bounded dimer (B) Two adjacent pyrimidine residues to form covalently bonded dimer (C) Disruption of phosphodiesterase linkage (D) Disruption of non-covalent linkage
Last Answer : Answer : B
Description : Insulin receptor is a (A) Monomer (B) Dimer (C) Trimer (D) Tetramer
Description : Thyroid stimulating hormone is a dimer. The α-subunits of TSH, LH, FSH are identical. Thus the biological specificity must therefore be β subunit in which the number of amino acids is (A) 78 (B) 112 (C) 130 (D) 199
Description : Lactate dehydrogenase is a (A) Monomer (B) Dimer (C) Tetramer (D) Hexamer
Last Answer : Answer : C
Description : Bence-Jones protein is (A) An immunoglobulin (B) A dimer of heavy chains (C) A dimer of light chains (D) A dimer of one heavy and one light chains
Description : The hydrogen bonds between peptide linkages are interfered by (A) Guanidine (B) Uric acid (C) Salicylic acid (D) Oxalic acid
Last Answer : Answer : A
Description : The hydrogen bonds between peptide linkages of a protein molecules are interfered by (A) Guanidine (B) Uric acid (C) Oxalic acid (D) Salicylic acid
Description : The number of hydrogen bonds between guanine and cytosine in DNA is – (1) 2 (2) 3 (3) 4 (4) 1
Last Answer : (2) 3 Explanation: The chemistry of the nitrogenous bases is really the key to the function of DNA. It allows something called complementary base pairing. Cytosine can form three hydrogen bonds with guanine, and adenine can form two hydrogen bonds with thymine.
Description : Benzene undergoes substitution reaction more easily than addition reaction because (a) it has a cyclic structure (b) it has three double bonds (c) it has six hydrogen atoms (d) there is delocalization of electrons
Last Answer : there is delocalization of electrons
Description : The double helical structure of DNA is held together by (a) sulfur-sulfur linkages (b) peptide bonding (c) hydrogen bonding (d) glycosidic bonds
Last Answer : hydrogen bonding
Description : Which of the following pairs of compounds will not form hydrogen bonds with each other? (a) CH3OH and CH3CH2OH (b) CH3SH and CH3CH2SH (c) CH3OCH3 and CH3CH2OCH2CH3 (d) CH3COOH and H2O
Last Answer : CH3OCH3 and CH3CH2OCH2CH3
Description : Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater ... of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.
Last Answer : Hydrogen bonds must be broken in the process of volatilization
Description : The higher reactivity of an alkene or alkyne, as compared to an alkane, is due to (a) sigma bonds (b) pi bonds (c) hydrogen bonds (d) None of these
Last Answer : pi bonds
Description : Which one of the following substances will form strong hydrogen bonds? A HCOOH B CH3CN C CCl4 D SiH4 E CH3OCH3
Last Answer : A HCOOH
Description : A family of organic compounds containing only carb and hydrogen and having only single bonds are the: w) alkenes and alkanes x) alkanes and cycloalkanes y) alkynes (pron: AL-kines) and alkenes z) cycloalkanes and alkenes
Last Answer : ANSWER: B -- ALKANES AND CYCLOALKANES
Description : The angle between any two carbon-hydrogen bonds in a methane molecule is how many degrees?
Last Answer : ANSWER: 109.5 DEGREES
Description : The number of hydrogen bonds between guanine and cytosine in DNA is (1) 2 (2) 3 (3) 4 (4) 1
Last Answer : 3
Description : The formation of a peptide bond during the elongation step of protein synthesis results in the splitting of how many high energy bonds? (A) 1 (B) 2 (C) 3 (D) 4
Description : Glycogen synthetase catalyses the formation of (A) α−1, 4-Glycosidic bonds (B) α−1, 6-Glycosidic bonds (C) Both (A) and (B) (D) None of these
Description : Calcium is important in skeletal muscle contraction because it (a) binds to troponin to remove the masking of active sites on actin for myosin (b) activates the myosin ATPase by binding to it ... filament (d) prevents the formation of bonds between the myosin cross bridges and the actin filament.
Last Answer : (a) binds to troponin to remove the masking of active sites on actin for myosin
Description : In what type of chemical reaction are the products of water removed during the formation of covalent bonds? a. Hydrolysis b. Ionization c. Dehydration synthesis d. Decomposition
Last Answer : c. Dehydration synthesis
Description : Calcium is important in skeletal muscle contraction because it :- (1) binds to troponin to remove the masking of active sites on actin for myosin. (2) activates the myosin ATPase by binding to ... filament. (4) prevents the formation of bonds between the myosin cross bridges and the actin filament.
Last Answer : (1) binds to troponin to remove the masking of active sites on actin for myosin.
Description : How many hydrogen-bonded water molecule(s) are present in CuSO4.5H2O ? Draw its structure to show formation of hydrogen bond.
Last Answer : Ans- one molecule of water is bonded by hydrogen bond and is deeply embedded in the lattice, While four molecules are bonded with coordinate bond. [ Cu(H2O)4] SO4.H2O
Description : In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect
Last Answer : c. Secondary kinetic isotope effect
Description : What is the maximum number of hydrogen bonds in a H2 -Do You Know?
Last Answer : answer:
Description : In DNA segment of six coils, 22 bp are linked by two hydrogen bonds. How many cytosine would be present ?
Last Answer : In DNA segment of six coils, 22 bp are linked by two hydrogen bonds. How many cytosine would be present ? A. 22 B. 38 C. 44 D. 76
Description : $ DNA replication is semiconservative. ! Helicases are the enzymes which can break the hydrogen bonds between the nuclotides of DNA
Last Answer : $ DNA replication is semiconservative. ! Helicases are the enzymes which can break the hydrogen bonds between the ... D. If both As and R are wrong.
Description : Which of the following compounds has the least tendency to form hydrogen bonds between molecules ?
Last Answer : Which of the following compounds has the least tendency to form hydrogen bonds between molecules ? A. `NH_(3)` B. `H_(2)NOH` C. `HF` D. `CH_(3)F`
Description : Assertion : Phenol has lower boiling point then water Reason : Water forms more number of hydrogen bonds
Last Answer : Assertion : Phenol has lower boiling point then water Reason : Water forms more number of hydrogen ... false D. Assertion is false, Reason is true
Description : If oxygen which has an electronegativity of 3.5 bonds with hydrogen which has an electronegativity of 2.1 the bond between the two atoms will be classified as a polar what bond?
Description : How many bonds occur between the carbon and nitrogen atoms when drawing the Lewis dot structure for hydrogen cyanide?