Zymogen is a (A) Vitamin (B) Enzyme precursor (C) Modulator (D) Hormone

Zymogen is a (A) Vitamin (B) Enzyme precursor (C) Modulator (D) Hormone
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Zymogen is (A) An intracellular enzyme (B) Serum enzyme (C) A complete extracellular enzyme (D) An inactivated enzyme

Description : Zymogen is (A) An intracellular enzyme (B) Serum enzyme (C) A complete extracellular enzyme (D) An inactivated enzyme

Last Answer : Answer : D

Destruction of which of the following enzyme causes cyanide poisoning (a) Zymogen (b) Cytochrome enzyme (c) Urease (d) None of these

Description : Destruction of which of the following enzyme causes cyanide poisoning (a) Zymogen (b) Cytochrome enzyme (c) Urease (d) None of these

Last Answer : (b) Cytochrome enzyme

Cholesterol is a precursor in the biogenesis of (A) Vitamin A (B) Vitamin D (C) Vitamin E (D) None of these

Description : Cholesterol is a precursor in the biogenesis of (A) Vitamin A (B) Vitamin D (C) Vitamin E (D) None of these

Last Answer : Answer : B

Cholesterol is a precursor in the biogenesis of (A) Vitamin A (B) Vitamin D (C) Vitamin E (D) None of these

Description : Cholesterol is a precursor in the biogenesis of (A) Vitamin A (B) Vitamin D (C) Vitamin E (D) None of these

Last Answer : Answer : A

Precursor of Vitamin A is (A) α-Carotene (B) β-Carotene (C) γ-Carotene (D) All of these VITAMINS 121

Description : Precursor of Vitamin A is (A) α-Carotene (B) β-Carotene (C) γ-Carotene (D) All of these VITAMINS 121

Last Answer : Answer : D

β-Carotene, precursor of vitamin A, is oxidatively cleaved by (A) β-Carotene dioxygenase (B) Oxygenase (C) Hydroxylase (D) Transferase

Description : β-Carotene, precursor of vitamin A, is oxidatively cleaved by (A) β-Carotene dioxygenase (B) Oxygenase (C) Hydroxylase (D) Transferase

Last Answer : Answer : A

The precursor of bile salts, sex hormones and vitamin D is (A) Diosgenin (B) Cholesterol (C) Campesterol (D) Ergosterol

Description : The precursor of bile salts, sex hormones and vitamin D is (A) Diosgenin (B) Cholesterol (C) Campesterol (D) Ergosterol

Last Answer : Answer : B

A substance unrelated to substrate but capable of reversibly changing activity of enzyme by binding to a site other than active site is called (a) Competitive inhibitor (b) Non-competitive inhibitor (c) Catalytic inhibitor (d) Allosteric modulator/inhibitor

Description : A substance unrelated to substrate but capable of reversibly changing activity of enzyme by binding to a site other than active site is called (a) Competitive inhibitor (b) Non-competitive inhibitor (c) Catalytic inhibitor (d) Allosteric modulator/inhibitor

Last Answer : Ans. ((d))

Consider the following statements: (1) Copper is present in cytochrome oxidane (2) Pantothenic acid is precursor of co-enzyme-A (3) Thiamine prohosphate is the prosthetic group in decarboxylases (4) Zinc is present in RNA and DNA polymerases

Description : Consider the following statements: (1) Copper is present in cytochrome oxidane (2) Pantothenic acid is precursor of co-enzyme-A (3) Thiamine prohosphate is the prosthetic group in decarboxylases (4) Zinc is present in RNA and DNA polymerases

Last Answer : Ans. ((b))

H2O2 is precursor of A A. free radicals B. Enzyme C. Both D. None of these

Description : H2O2 is precursor of A A. free radicals B. Enzyme C. Both D. None of these

Last Answer : free radicals

Human insulins are obtained by the following sources/methods except: A. Cadaver pancreas B. Proinsulin recombinant bacterial C. Precursor yeast recombinant D. Enzyme modification of **** insulin

Description : Human insulins are obtained by the following sources/methods except: A. Cadaver pancreas B. Proinsulin recombinant bacterial C. Precursor yeast recombinant D. Enzyme modification of pork insulin

Last Answer : . Cadaver pancreas

Acute pancreatitis is characterised by (A) Lack of synthesis of zymogen enzymes (B) Continuous release of zymogen enzymes into the gut (C) Premature activation of zymogen enzymes (D) Inactivation of zymogen enzymes

Description : Acute pancreatitis is characterised by (A) Lack of synthesis of zymogen enzymes (B) Continuous release of zymogen enzymes into the gut (C) Premature activation of zymogen enzymes (D) Inactivation of zymogen enzymes

Last Answer : Answer : C

The zymogen from trypsinogen of pancreatic juice is converted to active trypsin by (A) Peisin (B) Enterocrinin (C) Enterokinase (D) Rennin

Description : The zymogen from trypsinogen of pancreatic juice is converted to active trypsin by (A) Peisin (B) Enterocrinin (C) Enterokinase (D) Rennin

Last Answer : Answer : C

What is the significance of zymogen activation?

Description : What is the significance of zymogen activation?

Last Answer : Gastro-intestinal enzymes are synthesised in the form of pro-enzymes, and only after secretion into the alimentary canal, they are activated. This prevents autolysis of cellular structural ... form, their activation takes place only when necessity arises. This prevents intravascular coagulation.

Give an example of zymogen is activated?

Description : Give an example of zymogen is activated? 

Last Answer : By splitting a single peptide bond, and removal of a small polypeptide from trypsinogen, the active trypsin is formed. This results in unmasking of the active centre.

What is zymogen?

Description : What is zymogen?

Last Answer : It is otherwise called pro-enzyme. Inactive zymogen is activated by removal of a piece of the pro-enzyme.

β-Carotene, precursor of vitamin A, is oxidatively cleaved by (A) β-Carotene dioxygenase (B) Oxygenase \ (C) Hydroxylase (D) Transferase

Description : β-Carotene, precursor of vitamin A, is oxidatively cleaved by (A) β-Carotene dioxygenase (B) Oxygenase \ (C) Hydroxylase (D) Transferase

Last Answer : (A) β-Carotene dioxygenase

Riboflavin is a/an - (1) Vitamin (2) Hormone (3) Fatty acid (4) Enzyme

Description : Riboflavin is a/an - (1) Vitamin (2) Hormone (3) Fatty acid (4) Enzyme

Last Answer : (1) Vitamin Explanation: Riboflavin, also known as vitamin B2, is one of the eight B-complex vitamins. It is a water-soluble vitamin that functions as a coenzyme, meaning that it is required for ... is found in milk, cheese, eggs, leaf vegetables, liver, kidneys, legumes, mushrooms, and almonds.

Process of digestion is helped by - (1) Enzyme (2) Hormone (3) Mineral (4) Vitamin

Description : Process of digestion is helped by - (1) Enzyme (2) Hormone (3) Mineral (4) Vitamin

Last Answer : (1) Enzyme Explanation: Enzymes are large biological molecules responsible for the thousands of chemical inter-conversions that sustain life. They are highly selective catalysts, greatly accelerating both the ... proteins, respectively) into smaller ones, so they can be absorbed by the intestines.

Insulin is a kind of ______. (1) hormone (2) protein (3) enzyme (4) vitamin

Description : Insulin is a kind of ______. (1) hormone (2) protein (3) enzyme (4) vitamin

Last Answer : (1) hormone Explanation: Insulin is a hormone made by the pancreas that allows our body to use sugar (glucose) from carbohydrates in the food that we eat for energy or to store glucose ... use Insulin helps keeps your blood sugar level from getting too hig (hyperglycemia) or too low hypoglycemia.

Insulin is a (a) vitamin (b) lipid (c) hormone (d) enzyme.

Description : Insulin is a (a) vitamin (b) lipid (c) hormone (d) enzyme.

Last Answer : (c) hormone

Enterokinase is (a) Enzyme (b) Hormone (c) Vitamin (d) None

Description : Enterokinase is (a) Enzyme (b) Hormone (c) Vitamin (d) None

Last Answer : (a) Enzyme

Riboflavin is a/an (1) Vitamin (2) Hormone (3) Fatty acid (4) Enzyme

Description : Riboflavin is a/an (1) Vitamin (2) Hormone (3) Fatty acid (4) Enzyme 

Last Answer : Vitamin

Process of digestion is helped by (1) Enzyme (2) Hormone (3) Mineral (4) Vitamin

Description : Process of digestion is helped by (1) Enzyme (2) Hormone (3) Mineral (4) Vitamin

Last Answer : Enzyme

The mechanism of synthesis of DNA and RNA are similar to all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is (D) They require a primer

Description : The mechanism of synthesis of DNA and RNA are similar to all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is (D) They require a primer

Last Answer : Answer : D

Insoinic acid is the biological precursor of (A) Cytosine and Uric acid (B) Adenylve acid and Glucine floc acid (C) Orotic acid and Uridylic acid (D) Adenosine acid Thymidine

Description : Insoinic acid is the biological precursor of (A) Cytosine and Uric acid (B) Adenylve acid and Glucine floc acid (C) Orotic acid and Uridylic acid (D) Adenosine acid Thymidine

Last Answer : Answer : B

The mechanism of synthesis of DNA and RNA are similar in all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is 5’ → 3’ (D) They require a primer

Description : The mechanism of synthesis of DNA and RNA are similar in all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is 5’ → 3’ (D) They require a primer

Last Answer : Answer : A

All of the following statements about tRNA are true except (A) It is synthesized as a large precursor (B) It is processed in the nucelolus (C) It has no codons or anticodons (D) Genes for rRNA are present in single copies

Description : All of the following statements about tRNA are true except (A) It is synthesized as a large precursor (B) It is processed in the nucelolus (C) It has no codons or anticodons (D) Genes for rRNA are present in single copies

Last Answer : Answer : D

Heterogeneous nuclear RNA is the precursor of (A) mRNA (B) rRNA (C) tRNA (D) None of these

Description : Heterogeneous nuclear RNA is the precursor of (A) mRNA (B) rRNA (C) tRNA (D) None of these

Last Answer : Answer : A

Pyrimidine and purine nucleoside biosynthesis share a common precursor: (A) PRPP (B) Glycine (C) Fumarate (D) Alanine

Description : Pyrimidine and purine nucleoside biosynthesis share a common precursor: (A) PRPP (B) Glycine (C) Fumarate (D) Alanine

Last Answer : Answer : A

All the following statements about βendorphin are true except µ : (A) It is a polypeptide (B) Its precursor is pro-opio-melanocortin (C) Its receptors are represent in brain (D) Its action is blocked by morphine

Description : All the following statements about βendorphin are true except µ : (A) It is a polypeptide (B) Its precursor is pro-opio-melanocortin (C) Its receptors are represent in brain (D) Its action is blocked by morphine

Last Answer : Answer : D

Immediate precursor of epinephrine is (A) Metanephrine (B) Norepinephrine (C) Dopa (D) Dopamine

Description : Immediate precursor of epinephrine is (A) Metanephrine (B) Norepinephrine (C) Dopa (D) Dopamine

Last Answer : Answer : B

All the following statements about proopiomelanocortin are true except (A) It is made up of 285 amino acids (B) It is synthesised in pars intermedia and anterior lobe of pituitary gland (C) It is the precursor of ACTH and melatonin (D) It is the precursor of corticotropin like intermediate lobe peptide and endorphins 218 MCQs IN BIOCHEMISTRY

Description : All the following statements about proopiomelanocortin are true except (A) It is made up of 285 amino acids (B) It is synthesised in pars intermedia and anterior lobe of pituitary gland ... ) It is the precursor of corticotropin like intermediate lobe peptide and endorphins 218 MCQs IN BIOCHEMISTRY

Last Answer : Answer : C

Precursor of ACTH is (A) Cholesterol (B) Pregnenolone (C) Corticotropin (D) Pro-opiomelanocortin

Description : Precursor of ACTH is (A) Cholesterol (B) Pregnenolone (C) Corticotropin (D) Pro-opiomelanocortin

Last Answer : Answer : D

The precursor of testosterone is (A) Aldosterone (B) Methyl testosterone (C) Estrone (D) Pregnenolone

Description : The precursor of testosterone is (A) Aldosterone (B) Methyl testosterone (C) Estrone (D) Pregnenolone

Last Answer : Answer : D

The common precursor in the biosynthesis of triacylglycerol and phospholipids is (A) 1, 2-Diacylglycerol phosphate (B) 1-Acylglycerol 3-phosphate (C) Glycerol 3-phosphate (D) Dihydroxyacetone phosphate

Description : The common precursor in the biosynthesis of triacylglycerol and phospholipids is (A) 1, 2-Diacylglycerol phosphate (B) 1-Acylglycerol 3-phosphate (C) Glycerol 3-phosphate (D) Dihydroxyacetone phosphate

Last Answer : Answer : A

In the pathway leading to biosynthesis of acetoacetate from acetyl-CoA in liver, the immediate precursor of aceotacetate is (A) Acetoacetyl-CoA (B) 3-Hydroxybutyryl-CoA (C) 3-Hydroxy-3-methyl-glutaryl-CoA (D) 3-Hydroxybutyrate

Description : In the pathway leading to biosynthesis of acetoacetate from acetyl-CoA in liver, the immediate precursor of aceotacetate is (A) Acetoacetyl-CoA (B) 3-Hydroxybutyryl-CoA (C) 3-Hydroxy-3-methyl-glutaryl-CoA (D) 3-Hydroxybutyrate

Last Answer : Answer : A

Which of the following intermediates of metabolism can be both a precursor and a product of glucose? (A) Lactate (B) Pyruvate (C) Alanine (D) Acetyl-CoA

Description : Which of the following intermediates of metabolism can be both a precursor and a product of glucose? (A) Lactate (B) Pyruvate (C) Alanine (D) Acetyl-CoA

Last Answer : Answer : A

The precursor of CoA is (A) Riboflavin (B) Pyridoxamine (C) Thiamin (D) Pantothenate

Description : The precursor of CoA is (A) Riboflavin (B) Pyridoxamine (C) Thiamin (D) Pantothenate

Last Answer : Answer : D

Cholesterol is the precursor for the biosynthesis of (A) fatty acid (B) prostaglandins (C) bile acids (D) sphingmyelin

Description : Cholesterol is the precursor for the biosynthesis of (A) fatty acid (B) prostaglandins (C) bile acids (D) sphingmyelin

Last Answer : Answer : C

All the following statements about angiotensin are true except (A) Its precursor is an α2-globulin (B) Its active form is an octapeptide (C) It is a vasodilator (D) It increases the secretion of aldosterone

Description : All the following statements about angiotensin are true except (A) Its precursor is an α2-globulin (B) Its active form is an octapeptide (C) It is a vasodilator (D) It increases the secretion of aldosterone

Last Answer : Answer : C

All the following statements about pepsin are correct except (A) It is smaller than pepsinogen (B) It is formed by the action of HCl on its precursor (C) Its optimum pH is 1.0–2.0 (D) It hydrolyses the C-terminal and N-terminal peptide bonds of proteins

Description : All the following statements about pepsin are correct except (A) It is smaller than pepsinogen (B) It is formed by the action of HCl on its precursor (C) Its optimum pH is 1.0–2.0 (D) It hydrolyses the C-terminal and N-terminal peptide bonds of proteins

Last Answer : Answer : D

Tryptophan could be considered as precursor of (A) Melanotonin (B) Thyroid hormones (C) Melanin (D) Epinephrine

Description : Tryptophan could be considered as precursor of (A) Melanotonin (B) Thyroid hormones (C) Melanin (D) Epinephrine

Last Answer : Answer : A

In mammalian tissues serine can be a biosynthetic precursor of (A) Methionine (B) Glycine (C) Tryptophan (D) Phenylalanine

Description : In mammalian tissues serine can be a biosynthetic precursor of (A) Methionine (B) Glycine (C) Tryptophan (D) Phenylalanine

Last Answer : Answer : B

Phenylalanine is the precursor of (A) L-DOPA (B) Histamine (C) Tyrosine (D) Throxine

Description : Phenylalanine is the precursor of (A) L-DOPA (B) Histamine (C) Tyrosine (D) Throxine

Last Answer : C

What is the precursor of leukotrienes?

Description : What is the precursor of leukotrienes?

Last Answer : They are produced from arachidonic acid.

Muscle glycogen will not serve as a precursor of blood sugar, why?

Description : Muscle glycogen will not serve as a precursor of blood sugar, why?

Last Answer : Glucose-6-phosphatase is absent in muscle.

Glucagon activates the enzyme adenylcyclase which causes the increase of blood sugar level. Hence this hormone is called (A) Hypoglycemic factor (B) Hyper glycemic factor (C) Antidiauritic factor (D) Thyrotropin-releasing factor

Description : Glucagon activates the enzyme adenylcyclase which causes the increase of blood sugar level. Hence this hormone is called (A) Hypoglycemic factor (B) Hyper glycemic factor (C) Antidiauritic factor (D) Thyrotropin-releasing factor

Last Answer : Answer : B

Conversion of testosterone to estradiol requires the enzyme: (A) Aromatase (B) Dehydrogenase (C) Lyase (D) Isomerase HORMONE METABOLISM 215

Description : Conversion of testosterone to estradiol requires the enzyme: (A) Aromatase (B) Dehydrogenase (C) Lyase (D) Isomerase HORMONE METABOLISM 215

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