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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.
| 6301. |
Cytochromes occur in [BHU 2001] |
| A. | Cristae of mitochondria |
| B. | Matrix of mitochondria |
| C. | Outer mitochondrial membrane |
| D. | Entire inner mitochondrial membrane |
| Answer» B. Matrix of mitochondria | |
| 6302. |
Cytochromes are [CBSE PMT 2001] |
| A. | Lipid |
| B. | Glycoprotein |
| C. | Metalloporphyrins |
| D. | \[F{{e}^{++}}\]containing with porphyrin pigment |
| Answer» E. | |
| 6303. |
Which of the following is not an electron transferring molecule [KCET 2001] |
| A. | ATP |
| B. | \[NA{{D}^{+}}\] |
| C. | Fe-S protein |
| D. | Co-enzyme Q |
| Answer» B. \[NA{{D}^{+}}\] | |
| 6304. |
Which one of the following energy storing compound is formed when succinyl CoA is converted into succinic acid [BHU 2000] |
| A. | ADP |
| B. | ATP |
| C. | AMP |
| D. | GTP |
| Answer» E. | |
| 6305. |
The pyruvic acid formed in Glycolysis is oxidised to\[C{{O}_{2}}\]and\[{{H}_{2}}O\]in a cycle called [MP PMT 1999] |
| A. | Calvin cycle |
| B. | Hill reaction |
| C. | Kreb's cycle |
| D. | Nitrogen cycle |
| Answer» D. Nitrogen cycle | |
| 6306. |
Which transfer electrons in E.T.S. (electron transport system) [CPMT 1998] |
| A. | Phytochrome |
| B. | \[{{F}_{1}}\]particles |
| C. | Fe - S |
| D. | Cytochrome |
| Answer» D. Cytochrome | |
| 6307. |
In Kreb's cycle, the FAD precipitates as electron acceptor during the conversion of [CBSE PMT 1997] |
| A. | Succinyl CoA to succinic acid |
| B. | a-ketoglutarate to succinyl CoA |
| C. | Fumaric acid to maleic acid |
| D. | Succinic acid to fumaric acid |
| Answer» E. | |
| 6308. |
The correct sequence of electron acceptor in ATP synthesis is [CBSE PMT 1997] |
| A. | \[Cytaa\text{ }b\text{ }c\] |
| B. | \[Cytb\text{ }c\text{ }a\text{ }{{a}_{3}}\] |
| C. | \[Cytb\text{ }c\text{ }{{a}_{3}}~a\] |
| D. | \[Cytc\text{ }b\text{ }a\text{ }{{a}_{3}}\] |
| Answer» C. \[Cytb\text{ }c\text{ }{{a}_{3}}~a\] | |
| 6309. |
The importance of Kreb's cycle is in the production of [MP PMT 1996] |
| A. | Acetyl CoA |
| B. | Water |
| C. | ATP |
| D. | ADP |
| Answer» D. ADP | |
| 6310. |
Kreb's cycle is also called [EAMCET 1995] |
| A. | TCA cycle |
| B. | Citric acid cycle |
| C. | Tricarboxylic cycle |
| D. | All the above |
| Answer» E. | |
| 6311. |
Which of the coenzyme is used in acetylation reaction |
| A. | CoA |
| B. | FAD |
| C. | FMN |
| D. | None of the above |
| Answer» B. FAD | |
| 6312. |
Upon the oxidation of one mole of pyruvate by mitochondrial respiration, the moles of ATP generated are [BHU 1994; KCET 1998] |
| A. | 38 |
| B. | 30 |
| C. | 8 |
| D. | 15 |
| Answer» E. | |
| 6313. |
The full form of NAD is [CPMT 1977] |
| A. | Nicotine adenosine diphosphate |
| B. | Nicotinamide adenosine dinucleotide |
| C. | Nicotinamide adenine dinucleotide |
| D. | Nicotinamide adenine diphosphate |
| Answer» D. Nicotinamide adenine diphosphate | |
| 6314. |
Enzymes of oxydative phosphorylation found in [CPMT 1983, 84; RPMT 1995; JIPMER 2001] |
| A. | Endoplasmic reticulum |
| B. | Chloroplast |
| C. | Mitochondria |
| D. | Golgi complex |
| Answer» D. Golgi complex | |
| 6315. |
Kreb's cycle begins with [CBSE PMT 1991] |
| A. | Pyruvic acid |
| B. | Hydrochloric acid |
| C. | Corticosteroids |
| D. | Lysine |
| Answer» B. Hydrochloric acid | |
| 6316. |
In an electron transport chain in terminal oxidation the cytochrome which donates electrons to\[{{O}_{2}}\]is [CPMT 1990] |
| A. | Cytochrome b |
| B. | Cytochrome c |
| C. | Cytochrome\[{{a}_{3}}\] |
| D. | Cytochrome a |
| Answer» D. Cytochrome a | |
| 6317. |
Kreb's cycle involves the formation of [AFMC 1987] |
| A. | Lactic acid from glucose |
| B. | Change of pyruvic acid to energy transformation |
| C. | Pyruvic acid from glucose |
| D. | ATP from ADP |
| Answer» C. Pyruvic acid from glucose | |
| 6318. |
In the electron transport system, the reduced coenzymes are regenerated by [CPMT 1990] |
| A. | Loss of hydrogen |
| B. | Loss of electron |
| C. | Addition of oxygen |
| D. | None of the above |
| Answer» C. Addition of oxygen | |
| 6319. |
Oxidative phosphorylation is the formation of [CBSE PMT 1992; BHU 1994, 99] |
| A. | \[NADP{{H}_{2}}\]in respiration |
| B. | ATP in respiration |
| C. | \[NADP{{H}_{2}}\]in photosynthesis |
| D. | ATP in photosynthesis |
| Answer» C. \[NADP{{H}_{2}}\]in photosynthesis | |
| 6320. |
Mineral activator needed for the enzymes carboxylase of TCA cycle is [NCERT 1975, 79] |
| A. | \[M{{g}^{++}}\] |
| B. | \[F{{e}^{+++}}\] |
| C. | \[M{{o}^{++}}\] |
| D. | \[M{{n}^{++}}\] |
| Answer» B. \[F{{e}^{+++}}\] | |
| 6321. |
Biological oxidation in Kreb's cycle involves [MP PMT 1994] |
| A. | \[{{N}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» D. \[S{{O}_{2}}\] | |
| 6322. |
Aerobic respiration which yields maximum ATP molecules is completed on [AMU 1990; BHU 1999] |
| A. | Mitochondria |
| B. | General cytoplasm |
| C. | General cytoplasm and mitochondria |
| D. | Somewhere else |
| Answer» B. General cytoplasm | |
| 6323. |
Cellular energy is provided through respiration and oxidation by [DPMT 1991] |
| A. | Golgi apparatus |
| B. | Endoplasmic reticulum |
| C. | Ribosomes |
| D. | Mitochondria |
| Answer» E. | |
| 6324. |
Cytochrome helps in [AFMC 1994; MP PMT 1996] |
| A. | Oxidation of glucose |
| B. | Release of energy |
| C. | Electron transport |
| D. | Growth |
| Answer» D. Growth | |
| 6325. |
Oxidative phosphorylation and photophosphorylation both require the electron carrier [MP PMT 1990] |
| A. | Cytochrome |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | Water |
| Answer» B. Oxygen | |
| 6326. |
Oxidation of succinate to fumerate in the Kreb's cycle is due to [CPMT 1990] |
| A. | Loss of electron from it |
| B. | Removal of hydrogen from it |
| C. | Addition of oxygen to it |
| D. | None of the above |
| Answer» C. Addition of oxygen to it | |
| 6327. |
The formation of acetyl coenzyme-A from pyruvic acid is the result of its [CPMT 1990] |
| A. | Reduction |
| B. | Dehydration |
| C. | Dephosphorylation |
| D. | Oxidative decarboxylation |
| Answer» E. | |
| 6328. |
TCA cycle is a |
| A. | Direct oxidation pathway |
| B. | Indirect oxidation pathway |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» C. Both [a] and [b] | |
| 6329. |
In which among the following oxidative phosphorylation occurs during electron transport [CPMT 1990] |
| A. | Chloroplast |
| B. | Ribosomes |
| C. | Mitochondria |
| D. | Glyoxysomes |
| Answer» D. Glyoxysomes | |
| 6330. |
In how many steps, \[C{{O}_{2}}\]is released in aerobic respiration of pyruvic acid [MP PMT 1989] |
| A. | One |
| B. | Six |
| C. | Three |
| D. | Twelve |
| Answer» D. Twelve | |
| 6331. |
Which of the following is correct sequence in Kreb's cycle [BHU 1989] |
| A. | Isocitric acid\[\to \]Oxalosuccinic acid\[\to \]\[\alpha -\]ketogluteric acid |
| B. | Oxalosuccinic acid\[\to \]Isocitric acid \[\alpha -\]ketogluteric acid |
| C. | \[\alpha -\]ketogluteric acid\[\to \]Isocitric acid\[\to \]Oxalosuccinic acid |
| D. | Isocitric acid\[\to \]\[\alpha -\]ketogluteric acid\[\to \]Oxalosuccinic acid |
| Answer» C. \[\alpha -\]ketogluteric acid\[\to \]Isocitric acid\[\to \]Oxalosuccinic acid | |
| 6332. |
The cycle in which pyruvic acid is broken down in presence of oxygen is known as [MP PMT 1988] |
| A. | Glycolysis |
| B. | Kreb's cycle |
| C. | Anaerobic respiration |
| D. | None of the above |
| Answer» C. Anaerobic respiration | |
| 6333. |
Food is converted to energy in [DPMT 1987] |
| A. | Chloroplast |
| B. | Nucleus |
| C. | Mitochondria |
| D. | None of the above |
| Answer» D. None of the above | |
| 6334. |
Kreb's cycle starts with the formation of six carbon compounds by reaction between [RPMT 1985] |
| A. | Maleic acid and acetyl CoA |
| B. | Succinic acid and pyruvic acid |
| C. | Fumaric acid and pyruvic acid |
| D. | Acetyl CoA and oxaloacetic acid |
| Answer» E. | |
| 6335. |
Respiratory enzymes are located in [DPMT 1986; MP PMT 2001; AMU 2005] |
| A. | Mitochondrial matrix (mitochondria) |
| B. | Perimitochondrial space |
| C. | Cristae |
| D. | Outer membrane |
| Answer» B. Perimitochondrial space | |
| 6336. |
Oxidative phosphorylation occurs in [DPMT 1985; CPMT 1983; CET Pune 1998] |
| A. | Outer membrane of mitochondria |
| B. | Inner membrane of mitochondria |
| C. | Stroma of chloroplast |
| D. | Grana of chloroplast |
| Answer» C. Stroma of chloroplast | |
| 6337. |
Which of the following observation most strongly support the view that mitochondria contain electron transfer enzymes aggregated into compact associations [AIIMS 1985; BHU 1991] |
| A. | A contractile protein capable of utilizing ATP has been obtained from mitochondria |
| B. | Mitochondria have highly folded inner wall |
| C. | Disruption of mitochondria yields membrane fragments which are able to synthesize ATP |
| D. | Mitochondria in animal embryos have a tendency to concentrate in cells which are to become part of locomotory structures |
| Answer» D. Mitochondria in animal embryos have a tendency to concentrate in cells which are to become part of locomotory structures | |
| 6338. |
In presence of TPP and carboxylase, pyruvic acid is transformed into |
| A. | Acetaldehyde and\[C{{O}_{2}}\] |
| B. | Ethyl alcohol and\[C{{O}_{2}}\] |
| C. | Citric acid and\[C{{O}_{2}}\] |
| D. | None of the above |
| Answer» B. Ethyl alcohol and\[C{{O}_{2}}\] | |
| 6339. |
Largest amount of phosphate bond energy is produced in the process of respiration during [CPMT 1984; DPMT 1991; BHU 2002] |
| A. | Anaerobic respiration |
| B. | Glycolysis |
| C. | Kreb's cycle |
| D. | None of the above |
| Answer» D. None of the above | |
| 6340. |
Mitochondria is the site of [CPMT 1985] |
| A. | \[C{{O}_{2}}\]uptake in photosynthesis |
| B. | \[{{O}_{2}}\]uptake during respiration |
| C. | The release of energy during respiration |
| D. | Cell division |
| Answer» D. Cell division | |
| 6341. |
Which of the following is the site of respiration within the cell [CPMT 1984; RPMT 1995; Bihar MDAT 1995; AFMC 2003] |
| A. | Ribosomes |
| B. | Nucleus |
| C. | Golgi body |
| D. | Mitochondria |
| Answer» E. | |
| 6342. |
The reaction of Kreb's cycle take place [CPMT 1984, 85, 88, 93, 94; BHU 1985, 88; CBSE PMT 1996; MP PMT 1997; JIPMER 2001; AIEEE 2003] |
| A. | In cytoplasm |
| B. | In endoplasmic reticulum |
| C. | In matrix of mitochondria |
| D. | On the surface of mitochondrion |
| Answer» D. On the surface of mitochondrion | |
| 6343. |
In respiration, pyruvic acid is [CPMT 1984, 88; MP PMT 1986] |
| A. | Formed only when oxygen is available |
| B. | One of the product of Kreb's cycle |
| C. | Broken down into two carbon fragments and\[C{{O}_{2}}\] |
| D. | A result of protein breakdown |
| Answer» D. A result of protein breakdown | |
| 6344. |
Organelles which are regarded as 'Power house of the cell' and in which oxidative reaction of respiratory process take place are [CPMT 1984] |
| A. | Chloroplast |
| B. | Ribosome |
| C. | Mitochondria |
| D. | Endoplasmic reticulum |
| Answer» D. Endoplasmic reticulum | |
| 6345. |
Complete oxidation of 1 gm molecule of glucose gives rise to [CPMT 1980; MP PMT 1991] |
| A. | 68,60,000 cal |
| B. | 6,86,000 cal |
| C. | 68,600 cal |
| D. | 6,800 cal |
| Answer» C. 68,600 cal | |
| 6346. |
Most of the energy in the cell is liberated by oxidation of carbohydrate when [BHU 1980] |
| A. | Pyruvic acid is converted into\[C{{O}_{2}}\]and\[{{H}_{2}}O\] |
| B. | Pyruvic acid is converted into Acetyl\[CoA\] |
| C. | Sugar is converted into pyruvic acid |
| D. | Glucose is converted in alcohol and\[C{{O}_{2}}\] |
| Answer» B. Pyruvic acid is converted into Acetyl\[CoA\] | |
| 6347. |
The product formed by maleic dehydrogenase is |
| A. | Maleic acid |
| B. | Fumaric acid |
| C. | Oxaloacetic acid |
| D. | Succinic acid |
| Answer» D. Succinic acid | |
| 6348. |
Synthesis of ATP in mitochondria require [BHU 1979; DPMT 1992] |
| A. | Oxygen |
| B. | NADP |
| C. | FMN |
| D. | Pyruvic acid |
| Answer» B. NADP | |
| 6349. |
Kreb's cycle is also known as [NCERT 1975; EAMCET 1981; BHU 1978] |
| A. | Glyoxylate cycle |
| B. | EMP pathway |
| C. | Citric acid cycle |
| D. | Glycolate cycle |
| Answer» B. EMP pathway | |
| 6350. |
The number of steps required for oxidation of one molecule of pyruvic acid is |
| A. | 5 |
| B. | 6 |
| C. | 3 |
| D. | 12 |
| Answer» B. 6 | |