biology Mcqs
251. Which of the Euglenas (a Protoctista) character resembles that of animals______________?
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A. They can move

B. They lack cell wall

C. They do not have chlorophyll

D. Both a and b
252. Pancreas produces secretory granules that help in digestion. These granules after passing through endoplasmic reticulum are pinched off from ________ surface of Golgi apparatus:
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A. Maturating face

B. Any of them

C. Forming face

D. None of these

253. Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?
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A. Nitrobacter

B. Nitrosomonas

C. Pseudomonas

D. Rhizobium

254. Deoxygenated blood first enters in _________ part in fishes?
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A. Conus arteriosus

B. Sinus venosus

C. Left atrium

D. Right atrium

255. Factory of Ribosomal systhesis is__________?
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A. Nucleus

B. Cytoplasm

C. Endoplasmic reticulum

D. Nucleolus
256. Actin and myosin are the basic proteins involved in contractile machinery of our body to which type of proteins do they belong____________?
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A. Globular proteins

B. Fibrous Proteins

C. Both a and b

D. None of these

257. The element in basic structure of proteins which differentiate them from carbohydrates________?
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A. N

B. H

C. C

D. S
258. Total number of amino acids discovered so far in cells and tissues are______________?
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A. 170

B. 150

C. 20

D. 25

259. Which statement about enzyme is incorrect_________________?
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A. All enzymes are fibrous Proteins.

B. They without their cofactor are called apoenzyme.

C. They catalyze a chemical reaction without being utilized.

D. Some of them consist solely of protein with no non protein part.

260. If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?
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A. Enzymes get denatured at higher substrate conc

B. All the active sites on enzyme molecule are occupied

C. None of these

D. Rate of reaction is indirectly proportional to substrate concentration at this point

261. Triglyceride is also known as_____________?
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A. All of these

B. Neutral lipid

C. Natural lipid

D. Neutral wax

262. The greatest diversity of animals in the lake is found in which one of the following zones?
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A. Littoral zone

B. Limmnetic zone

C. Profundal zone

D. None of these

263. Which one is an organic compound_____________?
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A. Lipids

B. HCI

C. Water

D. CO2

264. Organisms of which of the following kingdom have absorptive mode of nutrition______________?
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A. Protoctista

B. Animalia

C. Prokaryotae

D. Fungi
265. Which of the following statement is incorrect about RNA_________________?
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A. It may be folded back on itself to give double helical characteristics.

B. The pentose sugar in it is Ribose.

C. It contains Adenine Guanine Thymine and Cytosine

D. It is present in the nucleoli

266. The structure which has been formed or modified from gill pouches in humans is___________?
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A. Gills

B. Eustachian tube

C. Lungs

D. Middle ear

267. Strengthening material of prokaryotic cell wall is__________?
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A. Chitin

B. Cellulose

C. Peptidoglycan or Murein.

D. Inorganic salts silica waxes and ligin

268. Which one of the following is correct sequence of stages of prophase 1 of meiosis
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A. Leptotene zygotene pachytene diplotene diakinesis

B. Zygotene leptotene pachytene diplotene diakinesis

C. Diakinesis diplotene pachytene leptotene zygotene

D. Pachytene leptotene diplotene zygotene diakinesis

269. Pick the odd one out
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A. Psilophyton

B. Psilotum

C. Rhynia

D. Cooksonia

270. In golgi apparatus the maturing face is____________?
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A. Concave

B. Biconcave

C. Convex

D. Spherical

271. Which one is abundant in animals___________?
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A. Glycogen

B. Cellulose

C. None of these

D. Starch

272. Excessive increase in temperature of medium causes the enzyme molecule to____________?
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A. Denatured

B. Unaffected

C. Activate

D. None of these

273. Sebum produced from sebaceous glands in a mammal helps in___________?
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A. Temperature regulation

B. Excretion

C. Protection against micro organisms

D. All of these

274. Cn(H2O)n. is a general formula of_____________?
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A. Carbohydrates

B. Monosaccharides

C. Ploysacharides

D. Oligosaccharides

275. Cellular digestion is associated with which organelle__________?
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A. Golgi bodies

B. Mitochondria

C. Plastids

D. Lysosomes
276. The first layer of cell wall which is formed is___________?
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A. Secondary wall

B. All of these

C. Middle lamella

D. Primary wall
277. Mycoplasmas have been included in bacteria because:
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A. Do not have a cell wall

B. Lack membrane bounded organelles

C. Reproduce by binary fission

D. Are heterotrophic

278. Whone is not the function of endoplasmic reticulum?
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A. Transport of material

B. Synthesis of conjugated molecules

C. Nerve impulse conduction

D. Mechanical support

279. Starch cellulose and glaycogen yield ___________ on complete hydrolysis?
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A. Glucose

B. Sucrose

C. Fructose

D. Maltose

280. The first stage of development in which a cavity appears is the__________?
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A. Morula

B. Gastrula

C. Balastula

D. Neurula

281. The simplest of oxygen producting photosynthetic organisms are____________?
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A. Bacteria

B. Cyanobacteria

C. Chlamydomonas

D. Algae

282. Which of the following organisms have Chitin as a major structural component of their cell wall________________?
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A. Protoctista

B. Prokaryotae

C. Plantae

D. Fungi
283. An activated enzyme consisting of polypeptide chain and a cofactor is called_______________?
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A. Apoenzyme

B. Holoenzyme

C. Activated enzyme

D. Both b and c
284. Which one the following fatty acid is more soluble in an organic solvent and has higher melting point____________?
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A. Butyric acid

B. Palmitic acid

C. All have same

D. Acetic acid

285. Which of the following substance is most favorable to form structural component of biological membranes___________?
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A. Hydrophilic Carbohydrates

B. Hydrophobic fats.

C. Both a and b

D. None of these

286. Hunger pangs usually begin ______ after the previous meal.
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A. 12-24 hours

B. 2-4 hours

C. 6-8 hours

D. 10-12 hours

287. Which of the statement about cell membrane is not true?
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A. It contains protein molecules embedded in lipid bilayer

B. It is a differentially permeable membrane.

C. It may get infolded to engulf solid or liquid material.

D. It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.
288. Animals fats are ______________ atroom temperature?
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A. None of these

B. Gases

C. Liquids

D. Solids
289. The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called_________________?
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A. Chemistry

B. Biochemistry

C. Molocular biology

D. Both a and b

290. Carbon commonly combines with______________?
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A. H

B. All of these

C. N & O

D. P & S

291. Which of the following does not show quaternary structure____________?
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A. Fibrin

B. Haemoglobin

C. Insulin

D. Pepsin

292. Annual rainfall in grassland is about_____________?
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A. More than 2500 mm

B. 250-750 mm

C. 750-1500 mm

D. Less than 250 mm

293. Sleep movements are a type of___________?
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A. Tactic movements

B. Growth movements

C. Paratonic movments

D. Turgor movements
294. Interconversion of carbohydrates proteins and lipids in living cells are an example of____________?
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A. Coordinated catabolic activities

B. Coordinated anabolic activities

C. Both A and B

D. Any one

295. Which of the following is most constant abiotic component of ecosystem___________?
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A. Water

B. Air

C. Gravity

D. Land

296. Proteins comprise of ___________% of the total dry weight of a cell?
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A. 40%

B. 70%

C. 50%

D. 60%

297. An enzyme which converts a dipeptide into separate amino acids is an example of__________?
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A. Hydrolase

B. Oxidoreductase

C. Decarboxylase

D. Transferase

298. Which of the following impart a red colour to Rose petals?
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A. Chloroplast

B. Chlorophyll

C. Chromoplast

D. Leucoplast

299. Which chemical component has the greatest contribution in the total mammalian cell weight__________?
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A. Carbohydrate

B. Water

C. Proteins

D. Lipids

300. Which of the following is the empirical formula of chlorophyll b?
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A. C55H72O5N4Mg

B. C55H70O5N4Mg

C. C55H70O6N4Mg

D. C55H72O6N4Mg