how is dna methylation used in dna repair? -General Knowledge

how is dna methylation used in dna repair? -General Knowledge
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Answer :

The mismatch-repair enzymes can use a lack of methylation to identify and remove newly synthesized DNA.
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Restriction enzymes and DNA methylation -Biology

Description : Restriction enzymes and DNA methylation -Biology

Last Answer : answer:

Newly synthesized tRNA undergoes posttranscriptional modifications which include all the following except (A) Reduction in size (B) Methylation of some bases (C) Formation of pseudouridine (D) Addition of C-C-A terminus at 5’ end

Description : Newly synthesized tRNA undergoes posttranscriptional modifications which include all the following except (A) Reduction in size (B) Methylation of some bases (C) Formation of pseudouridine (D) Addition of C-C-A terminus at 5’ end

Last Answer : Answer : D

UTP is converted to CTP by (A) Methylation (B) Isomerisation (C) Amination (D) Reduction

Description : UTP is converted to CTP by (A) Methylation (B) Isomerisation (C) Amination (D) Reduction

Last Answer : Answer : C

d-UMP is converted to TMP by (A) Methylation (B) Decarboxylation (C) Reduction (D) Deamination

Description : d-UMP is converted to TMP by (A) Methylation (B) Decarboxylation (C) Reduction (D) Deamination

Last Answer : Answer : A

Epinephrine is derived from norepinephrine by (A) Decarboxylation (B) Hydroxylation (C) Oxidation (D) N-methylation

Description : Epinephrine is derived from norepinephrine by (A) Decarboxylation (B) Hydroxylation (C) Oxidation (D) N-methylation

Last Answer : Answer : D

The sequential steps in the conversion of tyrosine to epinephrine are (A) Ring hydroxylation-decarboxylation-side chain hydroxylation-N-methylation (B) Side chain hydroxylation-decarboxylation-ring hydroxylation N-methylation (C) Decarboxylation-ring hydroxylation-side chain hydroxylation-N-methylation (D) N-methylation-decarboxylation-ring and side chain hydroxylation

Description : The sequential steps in the conversion of tyrosine to epinephrine are (A) Ring hydroxylation-decarboxylation-side chain hydroxylation-N-methylation (B) Side chain hydroxylation-decarboxylation- ... chain hydroxylation-N-methylation (D) N-methylation-decarboxylation-ring and side chain hydroxylation

Last Answer : Answer : A

One of the main functions of Vitamin K is the cofactor for (A) Carboxylase for the formation of γ--carboxy glutamate (B) Methylation by S-adenosyl methionine (C) Carboxylation by biotin (D) One carbon transfer by tetra hydrofolate

Description : One of the main functions of Vitamin K is the cofactor for (A) Carboxylase for the formation of γ--carboxy glutamate (B) Methylation by S-adenosyl methionine (C) Carboxylation by biotin (D) One carbon transfer by tetra hydrofolate

Last Answer : Answer : A

One of the main functions of Vitamin K is cofactor for (A) Carboxylate for the formation of γ carboxyglutamate (B) Methylation of δ-adenosyl methionine (C) Carboxylation of biotin (D) One carbon transfer by tetrahydrofolate

Description : One of the main functions of Vitamin K is cofactor for (A) Carboxylate for the formation of γ carboxyglutamate (B) Methylation of δ-adenosyl methionine (C) Carboxylation of biotin (D) One carbon transfer by tetrahydrofolate

Last Answer : Answer : A

Both folic acid and methyl cobalamin (vitamin B12) are required in (A) Deamination of serine (B) Deamination of threonine (C) Conversion of pyridoxal phosphate to pyridoxamine phosphate (D) Methylation of homocystein to methionine

Description : Both folic acid and methyl cobalamin (vitamin B12) are required in (A) Deamination of serine (B) Deamination of threonine (C) Conversion of pyridoxal phosphate to pyridoxamine phosphate (D) Methylation of homocystein to methionine

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Histidine is converted into histamine by (A) Carboxylation (B) Decarboxylation (C) Methylation (D) Hydroxylation

Description : Histidine is converted into histamine by (A) Carboxylation (B) Decarboxylation (C) Methylation (D) Hydroxylation

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The primary mechanism underlying the resistance of gram-positive organisms to macrolide antibiotics is (a) Methylation of binding sites on the 50S ribosomal subunit (b) Formation of esterases that hydrolyze the lactone ring (c) Increased activity of efflux mechanisms (d) Formation of drug-inactivating acetyltranferases (e) Decreased drug permeability of the cytoplasmic membrane

Description : The primary mechanism underlying the resistance of gram-positive organisms to macrolide antibiotics is (a) Methylation of binding sites on the 50S ribosomal subunit (b) Formation of ... ) Formation of drug-inactivating acetyltranferases (e) Decreased drug permeability of the cytoplasmic membrane

Last Answer : Ans: A

Drug called ‘Heroin’ is synthesised by (a) nitration of morphine (b) methylation of morphine (c) acetylation of morphine (d) glycosylation of morphine.

Description : Drug called ‘Heroin’ is synthesised by (a) nitration of morphine (b) methylation of morphine (c) acetylation of morphine (d) glycosylation of morphine.

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The following are true about the neurotransmitters: a. acetylcholine is inactivated mainly by presynaptic reuptake b. tyrosine is essential for the formation of dopamine c. noradrenaline is inactivated mainly by hydrolysis d. adrenaline is formed from methylation of the noradrenaline

Description : The following are true about the neurotransmitters: a. acetylcholine is inactivated mainly by presynaptic reuptake b. tyrosine is essential for the formation of dopamine c. noradrenaline is inactivated mainly by hydrolysis d. adrenaline is formed from methylation of the noradrenaline

Last Answer : adrenaline is formed from methylation of the noradrenaline

The primary action by which entacapone and tolcapone enhance the therapeutic effect of levodopa-carbidopa in parkinsonism is: A. Inhibition of levodopa methylation in the liver B. Inhibition of dopamine methylation in the brain C. Inhibition of oxidative deamination of dopamine in the brain D. Facilitation of active transport of levodopa across brain capillaries

Description : The primary action by which entacapone and tolcapone enhance the therapeutic effect of levodopa-carbidopa in parkinsonism is: A. Inhibition of levodopa methylation in the liver B. Inhibition of ... of dopamine in the brain D. Facilitation of active transport of levodopa across brain capillaries

Last Answer : A. Inhibition of levodopa methylation in the liver

The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Description : The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Last Answer : C. Axonal uptake

The most commonly occurring conjugation reaction for drugs and their metabolites is: A. Glucuronidation B. Acetylation C. Methylation D. Glutathione conjugation

Description : The most commonly occurring conjugation reaction for drugs and their metabolites is: A. Glucuronidation B. Acetylation C. Methylation D. Glutathione conjugation

Last Answer : A. Glucuronidation

The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Description : The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Last Answer : C. Axonal uptake

The most commonly occurring conjugation reaction for drugs and their metabolites is: A. Glucuronidation B. Acetylation C. Methylation D. Glutathione conjugation

Description : The most commonly occurring conjugation reaction for drugs and their metabolites is: A. Glucuronidation B. Acetylation C. Methylation D. Glutathione conjugation

Last Answer : A. Glucuronidation

Vegetable oil is made into margarine through: w) halogenation x) partial hydrogenation y) methylation z) oxidation

Description : Vegetable oil is made into margarine through: w) halogenation x) partial hydrogenation y) methylation z) oxidation

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How DNA Repair can happen?

Description : How DNA Repair can happen? 

Last Answer : A. DNA damage caused by ultraviolet light: 1. cyclobutane-type pyrimidine dimer is the major photoproduct formed 2. a second product, the 6-4 photoproduct, is formed in about 10 % of UV induced ... 2. Bloom's syndrome. 3. Cockayne's syndrome 4. Fanconi's anemia 5. Ataxia telangiectasia   

Which of the following are examples of repair mechanisms in cells? a. mismatch repair b. excision repair c. DNA polymerase d. DNA ligase e. all are important in fixing mutations

Description : Which of the following are examples of repair mechanisms in cells? a. mismatch repair b. excision repair c. DNA polymerase d. DNA ligase e. all are important in fixing mutations

Last Answer : e. all are important in fixing mutations

Excision repair would correct DNA damage caused by a. Antibiotics. b. UV Light. c. A Chemical Mutagen. d. A Dna Replication Error.

Description : Excision repair would correct DNA damage caused by a. Antibiotics. b. UV Light. c. A Chemical Mutagen. d. A Dna Replication Error.

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Why Deinococcusradiodurans is able to survive massive exposure to radiation? A- .Because it produces a thick shell which acts as a shield from the radiation B- Because it has unique DNA repair mechanisms C- Because its cellwall contains radioactive elements D- Because it has many copies of genes encoding DNA repair

Description : Why Deinococcusradiodurans is able to survive massive exposure to radiation? A- .Because it produces a thick shell which acts as a shield from the radiation B- Because it has unique DNA repair ... its cellwall contains radioactive elements D- Because it has many copies of genes encoding DNA repair

Last Answer : Because it has many copies of genes encoding DNA repair