biology Mcqs
301. The part of chloroplast where CO2 is fixed to manufacture sugar is__________?
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A. Grana

B. Thylakoid

C. Stroma?

D. Outer membrane

302. The food of hydra consists of___________?
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A. Small crustaceans

B. Detritus

C. Humus

D. Dead microscopic animals

303. An insulin molecule consists of _________ polypeptide chains?
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A. 3

B. 1

C. 4

D. 2
304. Secretin inhibits production of__________________?
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A. Gastric juice

B. Bile

C. All of these

D. Pancreatic juice

305. The cells present in testes and secrete testosterone are___________?
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A. Germinal cell

B. Sertoli cells

C. Interstitial cells

D. Spermatocyte

306. Centrioles are composed of ________ triplets of microtubules.
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A. 15

B. 3

C. 9

D. 10

307. The survival of an animal depends upon its ability to take some from its environment____________?
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A. Inorganic molecules

B. Organic molecules

C. Chemicals

D. Hydrocarbons

308. Specific heat of vaporization of water is_______________?
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A. 574 Kcal/kg

B. 774 Kcal/kg

C. 674 Kcal/kg

D. 874 Kcal/kg

309. Which statement correctly describes the transcription of DNA?
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A. It is a semi conservation process

B. It produces mRNA

C. It occurs at surface of ribosomes

D. It produces another DNA molecule

310. For the synthesis of 10g of glucose ______________ of energy is required?
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A. 717.6 Kcal

B. 727 Kcal

C. 737 Kcal

D. 747 Kcal

311. Lock and Key model was proposed by______________?
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A. Koshland

B. Emil Fischer

C. Rudolph Virchow

D. Robin Williams

312. Scurvy and beri beri and caused by the deficiency of___________?
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A. Vitamin C and B

B. Vitamin B and C

C. Vitamin B and D

D. Vitamin A and B

313. In esterification OH comes from_______________?
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A. Alcohol

B. Sugar

C. Water

D. Organic acid

314. A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called_________________?
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A. Binding site

B. Active site

C. Allosteric site

D. Catalytic site

315. Humming bird is an example of________________?
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A. Ectotherm

B. oded animal

C. Endotherm

D. Heterotherm
316. Magnifying power of electron microscope as compared to eye is____________?
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A. 250X

B. 250000X

C. 500000X

D. 500 X

317. Ribosomes + m-RNA?
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A. Polosome

B. Polysome

C. Phlosome

D. None of these

318. Which conjegated molecules play important role in gene expression___________?
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A. Glycolipids

B. Glycoproteins

C. Nucleohistones

D. None of these

319. Enzymes __________________ the activation energy of a chemical reaction?
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A. Increases or decreases depending upon individual enzyme

B. Decreases

C. Increases

D. Does not effect

320. Which structure of protein gives information aboutnumber and sequence of amino acids in it_______________?
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A. Tertiary structure

B. Quaternary structure

C. Primary structure

D. Secondary structure

321. Reactions in which simple substances are combined to form complex substances are called_____________?
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A. Anabolic reactions

B. Catabolic reactions

C. Metabolic reactions

D. None of these

322. Variety among amino acids is produced due to_____________?
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A. All of these

B. R group

C. COOH group

D. NH2 group

323. There are mainly __________ types of tRNA?
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A. 15

B. 20

C. 170

D. 25

324. Membranes of the grane are sites where?
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A. Food is stored

B. CO2 is stored.

C. Oxygen is stored

D. Sunlight is trapped
325. An example of codominance is______________?
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A. AB blood group

B. B blood group

C. O blood group

D. A blood group

326. Which of the following combination is an example of self replicating organelles?
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A. Mitochondria Nucleus

B. Mitochondria Vacuole

C. Mitochondria Ribosomes

D. Mitochondria Chloroplast?
327. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?
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A. Activator

B. Enzymes

C. Cofactor

D. Coenzymes

328. Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________?
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A. Cytoplasm

B. Golgi apparatus

C. Ribosomes

D. Endoplasmic reticulum

329. According to Lamarch evolution occurred as the result of__________?
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A. Inheritance of acquired characters

B. Over production

C. The theory of recapitulation

D. Natural selection

330. __________ is example of pure form of cellulose?
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A. Paper

B. Wool

C. Cotton

D. Silk

331. Non polar organic molecules are ___________ in water?
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A. Depends upon condition

B. Soluble

C. Insoluble

D. Partially soluble

332. The trioses which are intermediate in respiration and photosynthesis are_______________?
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A. Glyceraldehydes

B. Dihydroxy acetone

C. Both of these

D. None of these

333. Which of the following occurs in anaerobic respiration but not in aerobic respiration?
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A. Release of CO2

B. Reduction of NAD

C. Formation of ATP

D. Production of ethanol from acetaldehyde
334. Five kingdom classification was proposed by_____________?
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A. Robert Whittaker

B. Lynn Margulis and Karlene Schwartz

C. Carlous Linnaeus

D. E-Chatton

335. A bond formed by linkage between -OH of carboxyl group of one amino acid and H of amino group of another amino acid which releases water is called__________?
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A. Phosphodiester linkage

B. Glycosidic bond

C. Peptide bond

D. Hydrogen bond

336. Which one forms the raw material for coenzymes_______________________?
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A. Vitamins

B. Proteins

C. Carbohydrates

D. Metals

337. A cofactor made of inorganic ion which is detachable is called__________________?
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A. Cofactor

B. Coenzyme

C. Activator

D. Prosthetic group

338. Extreme change in pH results in______________?
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A. Change in ionization of amino acids at the active site of the enzyme

B. Increase in the reaction rate

C. Denaturation of the enzyme

D. Change in the ionization of the substrate

339. Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________?
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A. Cisternae

B. Cristae

C. Polysomes

D. Cytosol

340. According to cohesion-tension theory, tension is created by__________________?
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A. Transpiration

B. Root prerssure

C. Adhesion

D. Hydrogen bonding

341. Which statement is incorrect about Lock and Key Model________________?
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A. It explains the mechanism of every chemical reaction

B. Active site of an enzyme is a non flexible structure

C. Active site does not change before during or even after the reaction

D. Specific enzyme can transform only a specific substrate

342. Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________?
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A. Watson & Crick

B. F.Miescher

C. Harshay & Chase

D. Chargaff
343. Genes will not be found in gene pairs in the_____________?
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A. Uterine cells of dog

B. Guard cells of leaf

C. Muscle cell of worm

D. Sperm cells of frog
344. The one which is present in all living things is ___________?
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A. DNA or RNA

B. Vacuole

C. Cell nucleus

D. Cell membrane

345. Far-red light promotes flowering in_______________?
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A. None of these

B. Day neutral plant

C. Long day plant

D. Short day plant
346. Which step causes activation of catalytic site of an enzyme__________________?
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A. Change in temperature

B. Formation of Enzyme Susstrate complex.

C. Change in the charge of the active site.

D. Change in pH of the surroundings.

347. Which of the following polysaccharide is called animal starch_________________?
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A. None of these

B. Starch

C. Glycogen

D. Cellulose

348. Which statement is true about an aqueous medium________________?
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A. Enzymes can not perform catalysis reaction in this medium

B. Ionic as well as non ionic substance in aqueous media retains their identity

C. Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions

D. It is less favorable media for chemical reactions

349. _____________ is a nervous disorder characterized by involuntary tremors, diminished motor power and rigidity?
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A. Parkinsons disease

B. Alzheimers disease

C. Epilepsy

D. Meningitis

350. Protein coasts of viruses are synthesized in____________?
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A. Lytic cycle

B. Lysogenic cycle

C. Both a & b

D. All of these