What is covalent modification?

What is covalent modification?
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1 Answer

Answer :

It means, either addition of a group to the enzyme protein by a covalent bond; or removal of a group by cleaving a covalent bond.
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Related questions

Regulation of haem synthesis occurs by (A) Covalent modification (B) Repression - derepression (C) Induction (D) Allosteric regulation

Description : Regulation of haem synthesis occurs by (A) Covalent modification (B) Repression - derepression (C) Induction (D) Allosteric regulation

Last Answer : Answer : B

Which one of the following regulatory actions involves a reversible covalent modification of the enzyme? (A) Phosphorylation of ser-OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition

Description : Which one of the following regulatory actions involves a reversible covalent modification of the enzyme? (A) Phosphorylation of ser-OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition

Last Answer : Answer : A

Which of the following regulatory reactions involves a reversible covalent modification of an enzyme? (A) Phosphorylation of serine OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition

Description : Which of the following regulatory reactions involves a reversible covalent modification of an enzyme? (A) Phosphorylation of serine OH on the enzyme (B) Allosteric modulation (C) Competitive inhibition (D) Non-competitive inhibition

Last Answer : Answer : A

Conversion of pepsinogen to pepsin is (A) Intra molecular rearrangement (B) Breaking of hydrogen bonds (C) Covalent modification (D) Polymerisation

Description : Conversion of pepsinogen to pepsin is (A) Intra molecular rearrangement (B) Breaking of hydrogen bonds (C) Covalent modification (D) Polymerisation

Last Answer : Answer : C

All the following statements about acetyl CoA carboxylase are true except: (A) It is activated by citrate (B) It is inhibited by palmitoyl CoA (C) It can undergo covalent modification (D) Its dephosphorylated form is inactive

Description : All the following statements about acetyl CoA carboxylase are true except: (A) It is activated by citrate (B) It is inhibited by palmitoyl CoA (C) It can undergo covalent modification (D) Its dephosphorylated form is inactive

Last Answer : Answer : D

Glucose-6-phosphatase and PEP carboxy kinase are regulated by (A) Covalent modification (B) Allosteric regulation (C) Induction and repression (D) All of these

Description : Glucose-6-phosphatase and PEP carboxy kinase are regulated by (A) Covalent modification (B) Allosteric regulation (C) Induction and repression (D) All of these

Last Answer : Answer : C

Pyruvate dehydrogenase complex is regulated by (A) Covalent modification (B) Allosteric regulation (C) Both (A) and (B) (D) None of these

Description : Pyruvate dehydrogenase complex is regulated by (A) Covalent modification (B) Allosteric regulation (C) Both (A) and (B) (D) None of these

Last Answer : Answer : C

Covalent modification of an enzyme usually involves phosphorylation / dephosphorylation of (A) Serine residue (B) Proline residue (C) Hydroxylysine residue (D) Hydroxyproline residue

Description : Covalent modification of an enzyme usually involves phosphorylation / dephosphorylation of (A) Serine residue (B) Proline residue (C) Hydroxylysine residue (D) Hydroxyproline residue

Last Answer : Answer : A

Covalent modification of an enzyme generally requires a (A) Hormone (B) cAMP (C) Protein kinase (D) All of these

Description : Covalent modification of an enzyme generally requires a (A) Hormone (B) cAMP (C) Protein kinase (D) All of these

Last Answer : Answer : D

Regulation of some enzymes by covalent modification involves addition or removal of (A) Acetate (B) Sulphate (C) Phosphate (D) Coenzyme

Description : Regulation of some enzymes by covalent modification involves addition or removal of (A) Acetate (B) Sulphate (C) Phosphate (D) Coenzyme

Last Answer : Answer : C

Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine

Description : Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine

Last Answer : Answer : D

Acetyl CoA carboxylase regulates fatty acid synthesis by which of the following mechanism? (A) Allosteric regulation (B) Covalent modification (C) Induction and repression (D) All of these

Description : Acetyl CoA carboxylase regulates fatty acid synthesis by which of the following mechanism? (A) Allosteric regulation (B) Covalent modification (C) Induction and repression (D) All of these

Last Answer : Answer : D

Give some examples of covalent modification.

Description : Give some examples of covalent modification.

Last Answer : Glycogen synthase is inactive, in the phosphorylated state, whereas glycogen phosphorylase is active when phosphorylated.

Introns in genes (A) Encode the amino acids which are removed during post-translational modification (B) Encode signal sequences which are removed before secretion of the proteins (C) Are the non-coding sequences which are not translated (D) Are the sequences that intervene between two genes

Description : Introns in genes (A) Encode the amino acids which are removed during post-translational modification (B) Encode signal sequences which are removed before secretion of the proteins (C) Are the non-coding sequences which are not translated (D) Are the sequences that intervene between two genes

Last Answer : Answer : C

Post-transcriptional modification does not occur in (A) Eukaryotic tRNA (B) Prokaryotic tRNA (C) Eukaryotic hnRNA (D) Prokaryotic mRNA

Description : Post-transcriptional modification does not occur in (A) Eukaryotic tRNA (B) Prokaryotic tRNA (C) Eukaryotic hnRNA (D) Prokaryotic mRNA

Last Answer : Answer : D

Post-transcriptional modification of hnRNA involves all of the following except (A) Addition of 7-methylguanosine triphosphate cap (B) Addition of polyadenylate tail (C) Insertion of nucleotides (D) Deletion of introns

Description : Post-transcriptional modification of hnRNA involves all of the following except (A) Addition of 7-methylguanosine triphosphate cap (B) Addition of polyadenylate tail (C) Insertion of nucleotides (D) Deletion of introns

Last Answer : Answer : C

Vitamin K is involved in posttranslational modification of the blood clotting factors by acting as cofactor for the enzyme: (A) Carboxylase (B) Decarboxylase (C) Hydroxylase (D) Oxidase

Description : Vitamin K is involved in posttranslational modification of the blood clotting factors by acting as cofactor for the enzyme: (A) Carboxylase (B) Decarboxylase (C) Hydroxylase (D) Oxidase

Last Answer : Answer : A

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

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

The chemical forces that bind most coenzymes and substrates to enzymes such as LDH are (A) Hydrogen bonds (B) Peptide bonds (C) Coordinate bonds (D) Covalent bonds

Description : The chemical forces that bind most coenzymes and substrates to enzymes such as LDH are (A) Hydrogen bonds (B) Peptide bonds (C) Coordinate bonds (D) Covalent bonds

Last Answer : Answer : D

Enzymes which catalyse binding of two substrates by covalent bonds are known as (A) Lyases (B) Hydrolases (C) Ligases (D) Oxidoreductases

Description : Enzymes which catalyse binding of two substrates by covalent bonds are known as (A) Lyases (B) Hydrolases (C) Ligases (D) Oxidoreductases

Last Answer : Answer : C

In biotin-containing enzymes, the biotin is bound to the enzyme by (A) An amide linkage to carboxyl group of glutamine (B) A covalent bond with CO2 (C) An amide linkage to an amino group of lysine (D) An amide linkage to α-carboxyl group of protein

Description : In biotin-containing enzymes, the biotin is bound to the enzyme by (A) An amide linkage to carboxyl group of glutamine (B) A covalent bond with CO2 (C) An amide linkage to an amino group of lysine (D) An amide linkage to α-carboxyl group of protein

Last Answer : Answer : C

All the following statements describing lipids are true except (A) They usually associate by covalent interactions (B) They are structurally components of membranes (C) They are an intracellular energy source (D) They are poorly soluble in H2O

Description : All the following statements describing lipids are true except (A) They usually associate by covalent interactions (B) They are structurally components of membranes (C) They are an intracellular energy source (D) They are poorly soluble in H2O

Last Answer : Answer : A

In quaternary structure, subunits are linked by (A) Peptide bonds (B) Disulphide bonds (C) Covalent bonds (D) Non-covalent bonds

Description : In quaternary structure, subunits are linked by (A) Peptide bonds (B) Disulphide bonds (C) Covalent bonds (D) Non-covalent bonds

Last Answer : Answer : D

Define co-ordination covalent bond.

Description : Define co-ordination covalent bond.

Last Answer : Co-ordination covalent bond is formed by the mutual sharing of pair of electrons between two atoms contributed by only one of the combining atoms.

Covalent bond is directional therefore which covalent property is shown ?

Description : Covalent bond is directional therefore which covalent property is shown ?

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Define polar covalent bond

Description : Define polar covalent bond

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Does the State of Texas’ Weather Modification program impact storms in the Gulf?

Description : Does the State of Texas’ Weather Modification program impact storms in the Gulf?

Last Answer : No, they wouldn’t waste the money on cloud seeding that produced no good for the state. Cloud seeding is usually done to promote rainfall for crops or to eliminate fog around air ports.

How do you feel about several states having weather modification programs?

Description : How do you feel about several states having weather modification programs?

Last Answer : I’ve been aware of cloud seeding for several years. Do you consider it a bad thing?

What is the most cruel body modification you could perpetrate against a person?

Description : What is the most cruel body modification you could perpetrate against a person?

Last Answer : Vagina nose or penis forehead

[SFW] If anything were possible, what body modification/s would you want?

Description : [SFW] If anything were possible, what body modification/s would you want?

Last Answer : I’d have a new prostate installed. 55 grams – like the ore that came standard.

Are tattoos/body modification becoming more acceptable and tolerated in professional settings?

Description : Are tattoos/body modification becoming more acceptable and tolerated in professional settings?

Last Answer : I reported to a VP, and knew several persons at my level who had tattoos. No big deal to have them, it was always considered good judgment to have them in places that were concealable if a client ... they just get nervous about putting you in front of a stuffy client if you can't easily conceal it.

I know I can make modification in Tiff format but I don’t exactly know how?

Description : I know I can make modification in Tiff format but I don’t exactly know how?

Last Answer : answer:You cannot modify text in TIFF-that is a picture format. And a TIFF format book is very unusual as the size of the files would be enormous. You might be able to do some modifications to your ... [more common for a book] depending on the software you have. Please show link for book. Thanks.

What is the going rate to have someone negotiate a mortgage modification for you?

Description : What is the going rate to have someone negotiate a mortgage modification for you?

Last Answer : I locked in at a fixed rate of 6.37 earlier this week. It might have gone down from there. I'm also refinancing thought so this might not be very much help. What are the exact terms you ... about working with an actual bank in a refinancing capacity. What you are talking about sounds kind of shady.

Have you ever used hypnotism to achieve behavior modification?

Description : Have you ever used hypnotism to achieve behavior modification?

Last Answer : I went to a hypnotherapist for several sessions to deal with some severe grief. He taped every session and gave me the tapes to keep. I ended up sobbing uncontrollably after each hour. It felt ... to a psychiatrist at the time and couldn't afford both. It was interesting and cleansing, however.

which of the following is not a component of behavior modification? -General Knowledge

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Last Answer : d. It emphasizes the use of summary labels for classifying individuals.

What type of modification of root is found in the Banyan tree? -Biology

Description : What type of modification of root is found in the Banyan tree? -Biology

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What is modification of root? -Biology

Description : What is modification of root? -Biology

Last Answer : Root Modifications. ... In some plants, the roots change their shape and get modified to absorb and transport water and minerals from the soil to different parts of the plant. They ... , food storage, and respiration. The root modifications perform two major functions- Physiological and Mechanical.

What type of modification of root is found in the Turnip? -Biology

Description : What type of modification of root is found in the Turnip? -Biology

Last Answer : Sometimes, roots are modified to serve some functions other than its main function of providing anchorage and absorption of water and minerals. Turnip: The tap root in turnip is modified for food storage.

What type of modification of root is found in the Mangrove trees? -Biology

Description : What type of modification of root is found in the Mangrove trees? -Biology

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What is modification of root? -Biology

Description : What is modification of root? -Biology

Last Answer : answer:

Which modification of root does not store food? -General Knowledge

Description : Which modification of root does not store food? -General Knowledge

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Which modification of root does not store food? -General Knowledge

Description : Which modification of root does not store food? -General Knowledge

Last Answer : answer:

What is genetic modification ?

Description : What is genetic modification ?

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Car modification prohibited in your country?

Description : Car modification prohibited in your country?

Last Answer : Certain car modifications are allowed in the country where I live. They are not so strict about this. However, they are strict if you want to do major modifications to your engine that would harm the environment ... would be forced to take their car to a garage and have them do the work for them.

Stapes is modification of `:-`

Description : Stapes is modification of `:-`

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Statement A : The primary transcript produced in eukaryotic is translated without undergoing any modification or processing. Statement B: The hn-RNA i

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$ Phylloclade is a stem modification. ! There are present flowers on these.

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Description : Tischenko reaction is a modification of

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A special sensitive region formed by cellular modification in DCT and afferent arterile at the location o their contact is called

Description : A special sensitive region formed by cellular modification in DCT and afferent arterile at the location o their contact is called

Last Answer : A special sensitive region formed by cellular modification in DCT and afferent arterile at the location o their contact is called

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Description : A special sensitive region formed by cellular modification in DCT and afferent arterile at the location o their contact is called

Last Answer : A special sensitive region formed by cellular modification in DCT and afferent arterile at the location o their contact is called