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Biochemistry

Description: biochemistry mcq
Number of Questions: 25
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Aminobenzyloxy methylcellulose or ABM paper is widely used in the field of study of biochemistry.

The ABM paper is widely used in which of the following fields of study?

  1. Study of proteins

  2. Study of carbohydrates

  3. Study of fats

  4. Study of nucleic acids

  5. Study of enzyme activities


Correct Option: D
Explanation:

ABM paper is widely used in the study of nucleic acids. ABM paper when chemically activated, binds single-stranded nucleic acid covalently.

Aconitase is the enzyme catalyzing the interconversion of citrate and isocitrate in the citric acid cycle.

Which of the following elements is found in the enzyme aconitase?

  1. Zinc

  2. Copper

  3. Manganese

  4. Iron

  5. Molybdenum


Correct Option: D
Explanation:

Aconitase is an iron-containing enzyme.

Gout is a painful disorder of bone joints.

Which of the following analogues of hypoxanthine is used in the treatment of gout?

  1. 6-mercaptopurine

  2. Allopurinol

  3. Alpha amanitin

  4. Amethopterin

  5. Aminopterin


Correct Option: B
Explanation:

Allopurinol is an analogue of hypoxanthine used to treat individuals suffering from hyperuricemia as a result of gout and other pathological conditions.

The proteins that bind to and severe the actin filaments are called actin-fragmenting proteins.

Which of the following calcium-dependent proteins is called actin-fragmenting protein?

  1. Accelerin

  2. Acumentin

  3. Gelsolin

  4. Actinin

  5. Ankyrin


Correct Option: C
Explanation:

Villin and gelsolin are called actin-fragmenting proteins.

Various inhibitors are used in the study of the electron transport system at various levels of electron carriers.

Which of the following substances acts as an inhibitor of the electron transport system between the flavoproteins and coenzyme Q?

  1. Atractyloside

  2. Bactoprenol

  3. Amytal

  4. Azurin

  5. Antimycin A


Correct Option: C
Explanation:

Amytal (5-ethyl-5-isoamylbarbituric acid) is a barbiturate drug that inhibits the electron transport system between the flavoproteins and coenzyme Q.

Naphthol blue black or Amido black 10B is a dye used for the spectrophotometric determination of proteins.

Which of the following compounds can bring about frame shift mutations?

  1. Acriflavin

  2. Acyclovir

  3. Agent orange

  4. Albomycin

  5. Naphthol blue black


Correct Option: A
Explanation:

Acriflavin is an acridine dye that may bring about frame shift mutations.

Glycerol is a typical breakdown product of fat or lipid and fatty acids being the other major counterparts.

Which of the following tests represents an example of the qualitative test for glycerol?

  1. Albustix test

  2. Anthrone test

  3. Acrolein test

  4. Allen's test

  5. Barfoed's test


Correct Option: C
Explanation:

Acrolein test is the qualitative test for glycerol, that is based on the dehydration and oxidation of glycerol to acrolein by heating with potassium bisulfate.

Various molecules and ions interact non-covalently in different ways.

Which of the following non-covalent interactions occurs when the outer electron orbitals overlap?

  1. Charge-dipole interaction

  2. Dipole-dipole interaction

  3. Dispersion

  4. Van der Waals repulsion

  5. Dipole-induced dipole interaction


Correct Option: D
Explanation:

Van der Waals repulsion occurs when the outer electron orbitals overlap.

Avidin is a protein in raw egg white.

Which of the following vitamins can combine with avidin producing the related deficiencies?

  1. Vitamin nicotinic acid

  2. Vitamin biotin

  3. Vitamin B12

  4. Vitamin E

  5. Vitamin D


Correct Option: B
Explanation:

Avidin combines tightly with the vitamin biotin and can produce symptoms of biotin deficiency. Hence,  biotin is also known as anti-egg-white-injury factor.

There are various chemical tests performed as a part of urine analysis.

Which of the following tests helps us to determine the presence of ammonia in urine?

  1. Albustix test

  2. Allen's test

  3. Bang method

  4. Berthelot reaction

  5. Bradshaw test


Correct Option: D
Explanation:

Berthelot reaction is a colorimetric test for the presence of ammonia in urine that is based on the production of blue indophenol upon treatment of urine with phenol and sodium hypochlorite.

Transpiration is the passage of water vapour through the surface of an organism, as the passage through a leaf or the skin.

Which of the following instruments is used to measure the rate of transpiration in plants?

  1. Porometer

  2. Bolometer

  3. Potometer

  4. Auxanometer

  5. Tensiometer


Correct Option: C
Explanation:

The rate of transpiration in plants or the suction of water due to transpiration is measured by the potometer.

Autocoids are a group of substances found naturally in our body that resemble hormones or drugs in their activity on cells and thus, act on restricted areas of our body.

Which of the following compounds is not an example of autacoids?

  1. Histamine

  2. Serotonin

  3. Angiotensin

  4. Prostaglandins

  5. Somatomammotropin


Correct Option: E
Explanation:

Somatomammotropin is a typical hormone and not an example of autocoid. It is a peptide placental hormone having growth hormone like roles.

Gibberellins are vital plant growth hormones.

Which of the following compounds represents the precursor for synthesis of gibberellins?

  1. Furfural

  2. Zeaxanthin

  3. Campesterol

  4. Tryptophan

  5. Ent-kaurene


Correct Option: E
Explanation:

Ent-kaurene represents the precursor for synthesis of gibberellins.

In terms of thermodynamics, entropy refers to the degree of randomness or disorder in a given system.

Which of the following examples represents a high entropy state?

  1. Ice at 0°C

  2. A bank manager’s desk

  3. A protein molecule in its native regular state

  4. A diamond at 0oK

  5. Water at 0°C


Correct Option: E
Explanation:

Water at 0°C is an example of high entropy state.

Hypoxanthine is a precursor of purine bases in both DNA and RNA.

Which of the following compounds is a well known example of hypoxanthine analog?

  1. Thymidine

  2. AZT

  3. 6-mercaptopurine

  4. Abrin

  5. Acetonyl-SCoA


Correct Option: C
Explanation:

6-mercaptopurine is a well known example of hypoxanthine analog that blocks nucleic acid synthesis.

Various phytohormones play various roles in growth and metabolic activities of plants.

Which of the following substances is required for increasing the size of apple during apple production?

  1. Morphactin

  2. Pomalin

  3. Vernalin

  4. Flavonoid

  5. Abscisic acid


Correct Option: B
Explanation:

Pomalin is a combination of cytokinin and gibberellin that is required for increasing the size of apple during apple production.

Isoproterenol is a well known metabolic analog used as a vital drug.

Which of the following hormonal actions is mimicked by isoproterenol?

  1. Glucagon

  2. Glucocorticoid

  3. Aldosterone

  4. Isoproterenol

  5. ACTH


Correct Option: E
Explanation:

Adrenocorticotropic hormone (ACTH) is an anterior pituitary hormone that stimulates the adrenal cortex.

An anticoagulant is a substance that prevents the clotting of blood. Most anticoagulants function by binding calcium ions.

Which of the following substances is not an example of anticoagulant?

  1. Oxalate

  2. Citrate

  3. Ethylenediaminetetraacetic acid

  4. Bombesin

  5. Heparin


Correct Option: D
Explanation:

Bombesin is a substance found in the gastrointestinal tract that stimulates gastric acid secretion and inhibits intestinal motility.

An artificial sweetener is a sugar substitute that aids in cutting calorie intake.

Which of the following substances is used as an artificial sweetener?

  1. Amphetamine

  2. Aspartame

  3. Bentonite

  4. Beta carotene

  5. CDP-sugar


Correct Option: B
Explanation:

Aspartame (Nutrasweet ) is used as an artificial sweetener.

Gluconeogenesis includes all mechanisms & pathways responsible for converting non-carbohydrates to glucose.

Which of the following factors plays a significant role in decreasing the rate of gluconeogenesis?

  1. Glucagon

  2. Epinephrine

  3. Glucocorticoids

  4. Insulin

  5. ATP


Correct Option: D
Explanation:

The rate of gluconeogenesis is decreased by insulin.

Mad cow disease or bovine spongiform encephalopathy is a prion based disease.

Which among the following scientists was awarded the Nobel Prize for his study on the agent responsible for ‘mad cow disease’?

  1. Gertrude Elion

  2. J. Skou

  3. James Black

  4. Stanley Prusiner

  5. Paul Boyer


Correct Option: D
Explanation:

Stanley Prusiner was awarded the Nobel Prize for the study on the agent responsible for mad cow disease.

Any outgrowth of a tissue is called a tumor. Tumor may be benign or malignant in nature.

Which of the following represents a blood-containing tumor connected directly with the arterial lumen?

  1. Ascites

  2. Atheroma

  3. Aneurysm

  4. Angioma

  5. Blastoma


Correct Option: C
Explanation:

Aneurysm represents a blood-containing tumor connected directly with the lumen of an artery.

Aromatic amino acids refer to the amino acids possessing an aromatic ring.

Which of the following aromatic amino acids contains an ionizable side chain?

  1. Tyrosine

  2. Valine

  3. Phenylalanine

  4. Tryptophan

  5. Lysine


Correct Option: A
Explanation:

Tyrosine is the relevant aromatic amino acid having an ionizable side chain.

The protein primary sequence refers to the sequence of the constituent amino acids, the building blocks of a protein.

Who among the following scientists were noted for determining the first protein primary sequence?

  1. Watson and Crick

  2. Hershey and Chase

  3. Embden and Meyerhof

  4. Sanger and Tuppy

  5. Eduard and Buchner


Correct Option: D
Explanation:

Sanger and Tuppy were noted for determining the first protein primary sequence.

Brassinosteroids are the typical growth-promoting phytosteroids.

The precursors for brassinosteroids are ________________.

  1. cholesterol

  2. campesterol

  3. ergosterol

  4. stigmasterol

  5. sitosterol


Correct Option: B
Explanation:

Campesterol is a type of phytosterol that acts as a precursor for synthesis of brassinosteroids.

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