MCQOPTIONS
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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 6401. |
Which of the following is iron porphyrin coenzyme or cofactor [DPMT 1987] |
| A. | Cytochrome |
| B. | FAD |
| C. | CoA |
| D. | NAD |
| Answer» B. FAD | |
| 6402. |
Coenzyme can function |
| A. | In association with a vitamin |
| B. | In association with an apoenzyme |
| C. | Independently of the apoenzyme |
| D. | In association with a protein |
| Answer» C. Independently of the apoenzyme | |
| 6403. |
Co-enzyme is [BHU 1994] |
| A. | Always a protein |
| B. | Often a vitamin |
| C. | Always an inorganic compound |
| D. | Often a metal |
| Answer» C. Always an inorganic compound | |
| 6404. |
Which of the following coenzyme is a derivative of pantothenic acid (Vitamin B complex) |
| A. | NAD |
| B. | NADP |
| C. | FAD |
| D. | CoA |
| Answer» E. | |
| 6405. |
Organic compounds having transient association with apoenzyme are called |
| A. | Holoenzyme |
| B. | Coenzyme |
| C. | Prosthetic group |
| D. | None of the above |
| Answer» C. Prosthetic group | |
| 6406. |
"Enzymes are proteins'', it was suggested by [BHU 1979] |
| A. | Miller |
| B. | Sumner |
| C. | Pasteur |
| D. | Leeuwenhock |
| Answer» C. Pasteur | |
| 6407. |
The enzyme, which combines with non-protein part to form a functional enzyme known as [BHU 2004] |
| A. | Co-enzyme |
| B. | Holoenzyme |
| C. | Apoenzyme |
| D. | Prosthetic group |
| Answer» C. Apoenzyme | |
| 6408. |
Non-protein part of an enzyme is known as [CPMT 1982; AFMC 1997; Orissa PMT 2002; BVP 2003] |
| A. | Holoenzyme |
| B. | Apoenzyme |
| C. | Coenzyme |
| D. | All the above |
| Answer» D. All the above | |
| 6409. |
Enzyme complex is called |
| A. | Holoenzyme |
| B. | Apoenzyme |
| C. | Coenzyme |
| D. | Prosthetic group |
| Answer» B. Apoenzyme | |
| 6410. |
The protein part of enzyme is known as [MP PMT 1996; AIIMS 2000; BVP 2000] |
| A. | Holoenzyme |
| B. | Apoenzyme |
| C. | Isoenzyme |
| D. | All of the above |
| Answer» C. Isoenzyme | |
| 6411. |
Most enzymes consist of two parts; these are |
| A. | Enzyme and substrate |
| B. | Enzyme and coenzyme |
| C. | Apoenzyme and enzyme |
| D. | Apoenzyme and prosthetic group |
| Answer» E. | |
| 6412. |
A dialysable non-protein organic substance which combines with apoenzyme to make a functional enzyme is |
| A. | Hormone |
| B. | Coenzyme or vitamin |
| C. | Proenzyme |
| D. | Prosthetic group |
| Answer» E. | |
| 6413. |
An enzyme can be synthesised by chemically bonding together molecules of [AFMC 1994] |
| A. | Carbohydrates |
| B. | Amino acids |
| C. | Lipases |
| D. | CO2 |
| Answer» C. Lipases | |
| 6414. |
Which one of the following is an enzyme |
| A. | Insulin |
| B. | Riboflavin |
| C. | Griseofulvin |
| D. | Lipase |
| Answer» E. | |
| 6415. |
Huge amount of starch is deposited in potato tubers due to [CPMT 1977; DPMT 1979] |
| A. | Chemical condensation of sugars |
| B. | Enzymatic transformations |
| C. | Synthesis of starch in tubers |
| D. | Absorption of nutrients |
| Answer» C. Synthesis of starch in tubers | |
| 6416. |
Which of the following is not a part of enzyme but it activates the enzyme [CBSE PMT 1989] |
| A. | K |
| B. | Zn |
| C. | Mg |
| D. | Mn |
| Answer» B. Zn | |
| 6417. |
The catalytic efficiency of two different enzymes can be compared by the [CBSE PMT 2005] |
| A. | Formation of the product |
| B. | The pH of optimum value |
| C. | The Km value |
| D. | Molecular size of the enzyme |
| Answer» D. Molecular size of the enzyme | |
| 6418. |
An average living cell contains about |
| A. | More than 1000 enzymes |
| B. | More than 2000 enzymes |
| C. | More than 3000 enzymes |
| D. | More than 5000 enzymes |
| Answer» C. More than 3000 enzymes | |
| 6419. |
The enzyme used for alcohol formation by fermantation is [MP PMT 1992; CPMT 2001] |
| A. | Invertase |
| B. | Lipase |
| C. | Amylase |
| D. | Zymase |
| Answer» E. | |
| 6420. |
Enzymes are different from inorganic catalysts [CPMT 1986, 90] |
| A. | Not being used up in reactions |
| B. | Being proteinaceous in nature |
| C. | Having high diffusion rate |
| D. | Working at high temperature |
| Answer» C. Having high diffusion rate | |
| 6421. |
What is correct about enzymes [CPMT 1988] |
| A. | They are most active at\[pH\,\,7.0\] |
| B. | They are all amino acids |
| C. | They are all proteins |
| D. | They are most active at a temperature of\[{{0}^{o}}C\] |
| Answer» D. They are most active at a temperature of\[{{0}^{o}}C\] | |
| 6422. |
Enzymes are useful to plants because [CPMT 1984] |
| A. | They are building block of chlorophyll |
| B. | They are essential for the metabolic processes |
| C. | They enhance absorption of water and salts |
| D. | They are responsible for paratonic movements |
| Answer» C. They enhance absorption of water and salts | |
| 6423. |
Which of the following is not an attribute of enzymes [NCERT 1976; CPMT 1985] |
| A. | They are proteinaceous in nature |
| B. | They speed up the rate of biochemical reactions |
| C. | They are specific in nature |
| D. | They are used up in reactions |
| Answer» E. | |
| 6424. |
Which one of the following enzyme is not composed of simple proteins |
| A. | Amylase |
| B. | Pepsin |
| C. | Urease |
| D. | None of the above |
| Answer» E. | |
| 6425. |
Who coined the term zymase for enzymes in yeast [BHU 2002] |
| A. | Kuhne |
| B. | Sumner |
| C. | Louis pasteur |
| D. | Edward Buchner |
| Answer» E. | |
| 6426. |
Enzymes are absent in [CBSE PMT 2000; AFMC 2003] |
| A. | Algae |
| B. | Fungi |
| C. | Bacteria |
| D. | Virus |
| Answer» E. | |
| 6427. |
cAMP mediated 'Cascade model' of enzyme regulation was proposed by [AllMS 1986] |
| A. | Fischer |
| B. | Sutherland |
| C. | Sumner |
| D. | Koshland |
| Answer» C. Sumner | |
| 6428. |
Which of the following statements is not correct [BHU 1992] |
| A. | All enzymes are proteins |
| B. | All enzymes are biocatalysts |
| C. | All proteins are enzymes |
| D. | All enzymes are thermolabile |
| Answer» D. All enzymes are thermolabile | |
| 6429. |
Enzymes are the polymers of [MP PMT 1994] |
| A. | Hexose carbon |
| B. | Fatty acids |
| C. | Amino acids |
| D. | Inorganic phosphate |
| Answer» D. Inorganic phosphate | |
| 6430. |
Biological catalysts are called [BVP 2001] |
| A. | Auxins |
| B. | Gibberellins |
| C. | Enzymes |
| D. | All the above |
| Answer» D. All the above | |
| 6431. |
In plants, enzymes are present [BHU 1985; CPMT 1987] |
| A. | Only in flowers |
| B. | Only in leaves |
| C. | In all the living cells of plant body |
| D. | Only in parenchyma |
| Answer» D. Only in parenchyma | |
| 6432. |
Enzyme are best defined as |
| A. | Catalysts |
| B. | Organo-catalysts |
| C. | Protein-catalysts |
| D. | Metallo-catalysts |
| Answer» D. Metallo-catalysts | |
| 6433. |
Which one of the following statements is true for the enzymes [MP PMT 1995; BVP 2002] |
| A. | All enzymes are proteins |
| B. | All proteins are enzymes |
| C. | All enzymes are not proteins |
| D. | All enzymes are vitamins |
| Answer» B. All proteins are enzymes | |
| 6434. |
Who first used the term "enzyme'' [CPMT 2004] |
| A. | J.B. Sumner |
| B. | Kuhne |
| C. | Thompson |
| D. | Garnier |
| Answer» C. Thompson | |
| 6435. |
The net gain of energy, from one molecule of sucrose in aerobic respiration, is [CBSE PMT 2001] |
| A. | 18 ATP |
| B. | 38 ATP |
| C. | 60 ATP |
| D. | 80 ATP |
| Answer» E. | |
| 6436. |
From substrate level phosphorylation ATP are produced [BHU 2000] |
| A. | 2 |
| B. | 6 |
| C. | 10 |
| D. | 8 |
| Answer» C. 10 | |
| 6437. |
Cristae are associated with which of the following [CBSE PMT 2000] |
| A. | Cytoplasm |
| B. | Protoplasm |
| C. | Mitochondria |
| D. | Ribosomes |
| Answer» D. Ribosomes | |
| 6438. |
Cristae helps in [AFMC 2000] |
| A. | Respiration |
| B. | Transpiration |
| C. | Photosynthesis |
| D. | Photo-oxidation |
| Answer» B. Transpiration | |
| 6439. |
Which of the following is the phosphorylating unit [AFMC 2000] |
| A. | Oxysome |
| B. | Mesosome |
| C. | Peroxisome |
| D. | Mitochondria |
| Answer» B. Mesosome | |
| 6440. |
The energy consumed during the conversion of ADP into ATP is [Pb. PMT 2000] |
| A. | 73000 cal/mole |
| B. | 686000 cal/mole |
| C. | 8000 cal/mole |
| D. | 7300 cal/mole |
| Answer» E. | |
| 6441. |
In mitochondria, cristae act as sites for [Pb. PMT 1999] |
| A. | Protein synthesis |
| B. | Oxidation-reduction reaction |
| C. | Breakdown of macromolecules |
| D. | Phosphorylation of flavoproteins |
| Answer» C. Breakdown of macromolecules | |
| 6442. |
Net gain of ATP molecules, during aerobic respiration, is [CBSE PMT 1999; CPMT 2002; RPMT 2002] |
| A. | 36 molecules |
| B. | 38 molecules |
| C. | 40 molecules |
| D. | 48 molecules |
| Answer» B. 38 molecules | |
| 6443. |
Which of the following is formed during respiration [MP PMT 1999] |
| A. | \[{{O}_{2}}\](Oxygen) |
| B. | \[C{{O}_{2}}\](Carbon dioxide) |
| C. | \[N{{O}_{2}}\](Nitrogen dioxide) |
| D. | \[S{{O}_{2}}\](Sulphur dioxide) |
| Answer» C. \[N{{O}_{2}}\](Nitrogen dioxide) | |
| 6444. |
The mechanism of ATP formation both in chloroplast and mitochondria is explained by [CBSE PMT 1997] |
| A. | Relay pump theory of Godlewski |
| B. | Cholodny-Wont's model |
| C. | Chemiosmotic theory |
| D. | Munch's hypothesis (mass flow model) |
| Answer» D. Munch's hypothesis (mass flow model) | |
| 6445. |
For which of the following process presence of chlorophyll is not necessary |
| A. | Photosynthesis |
| B. | Photorespiration |
| C. | Respiration |
| D. | None of the above |
| Answer» D. None of the above | |
| 6446. |
The amount of energy released in complete oxidation of one molecule of glucose is [RPMT 1997] |
| A. | 628 kcal |
| B. | 668 kcal |
| C. | 686 kcal |
| D. | 697 kcal |
| Answer» D. 697 kcal | |
| 6447. |
Make suitable pairing [RPMT 1997] [A] Glycolysis [a] Mitochondria [B] Kreb's cycle [b] Cytoplasmic matrix [C] Electron transport chain |
| A. | Aa, Ba, Cb |
| B. | Ab, Ba, Ca |
| C. | Aa, Bb, Cb |
| D. | Ab, Bb, Ca |
| Answer» C. Aa, Bb, Cb | |
| 6448. |
In oxidative phosphorylation, oxidation and phosphorylation take place simultaneously and form [CBSE PMT 1996] |
| A. | NADP |
| B. | DPN |
| C. | Pyruvic acid |
| D. | ATP |
| Answer» E. | |
| 6449. |
Highest calories is obtained from [CPMT 1996] |
| A. | Fats |
| B. | Proteins |
| C. | Carbohydrates |
| D. | Vitamins |
| Answer» B. Proteins | |
| 6450. |
Adenosine diphospate contains [CPMT 1995] |
| A. | One high energy bond |
| B. | Two high energy bond |
| C. | Three high energy bond |
| D. | Four high energy bond |
| Answer» B. Two high energy bond | |