Give some examples of covalent modification.

Give some examples of covalent modification.
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Glycogen synthase is inactive, in the phosphorylated state, whereas glycogen phosphorylase is active when phosphorylated.
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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

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

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

What is covalent modification?

Description : What is covalent modification?

Last 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.

Which aerial stem modification is concerned with vegetative propagation? Give two examples.

Description : Which aerial stem modification is concerned with vegetative propagation? Give two examples. 

Last Answer : Ans: Bulbils. Ex: Agave americana, Dioscoria bulbifera 

What are covalent and ionic bonds What are some examples?

Description : What are covalent and ionic bonds What are some examples?

Last Answer : ionic - Sodium Chloride Covalent - Water ionic - Sodium Chloride Covalent - Water

What are covalent and ionic bonds What are some examples?

Description : What are covalent and ionic bonds What are some examples?

Last Answer : ionic - Sodium Chloride Covalent - Water ionic - Sodium Chloride Covalent - Water

Sodium chloride, potassium chloride, magnesium oxide are examples of molecules with (a) Covalent bonding (b) Ionic bonding (c) Metallic bonding (d) Hydrogen bonding

Description : Sodium chloride, potassium chloride, magnesium oxide are examples of molecules with (a) Covalent bonding (b) Ionic bonding (c) Metallic bonding (d) Hydrogen bonding

Last Answer : Ans:(b)

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 ?

Last Answer : Space Isomerism

Define polar covalent bond

Description : Define polar covalent bond

Last Answer : The covalent bond formed by the unequal sharing of electrons between the two atoms is called polar covalent bond.

Give reason why boron and aluminum tend of form covalent compounds.

Description : Give reason why boron and aluminum tend of form covalent compounds.

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Give reason for the following: (a)LiCl is more covalent than KCl. (b)LiF has lower melting point than NaCl. (c)CuCl is more covalent than NaCl.

Description : Give reason for the following: (a)LiCl is more covalent than KCl. (b)LiF has lower melting point than NaCl. (c)CuCl is more covalent than NaCl.

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Give reasons : (a) Diamond and rhombic Sulphur are covalent solids, but the latter has lower melting points. (b) Among NaCl and CsCl, CsCl is quite stable.

Description : Give reasons : (a) Diamond and rhombic Sulphur are covalent solids, but the latter has lower melting points. (b) Among NaCl and CsCl, CsCl is quite stable.

Last Answer : (a) Due to weak Vander Waal’s Force in Sulphur molecule. (b) CsCl coordination number is 8. It is surrounded by 8 anion tightly. 

An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female species and tries to copulate with it, thereby pollinating the flower. This phenomenon is called (a) pseudopollination (b) pseudoparthenocarpy (c) mimicry (d) pseudocopulation.

Description : An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female species and tries ... phenomenon is called (a) pseudopollination (b) pseudoparthenocarpy (c) mimicry (d) pseudocopulation.

Last Answer : (d) pseudocopulation.

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?

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[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?

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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?

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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?

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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?

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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

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

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

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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

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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

Last Answer : The roots of mangrove plants grow vertically upwards from the soil for the absorption of oxygen from the atmosphere as the soil is poorly aerated. These types of roots are called as pneumatophores.

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

Last Answer : The answer is 'Stilt'

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

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

Last Answer : answer: