biology MCQs – Page 13

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
241. During digesting the phagocytosed food particles vesicles formed from fusion of phagocytic vacuole with the enzymes secreted by Golgi apparantus are called_______?
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A. Primary lysosomes

B. Food vacuole

C. Lysosomes

D. Secondary lysosomes
242. The major constituent of blood plasma is___________?
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A. Water

B. Protein

C. Cholesterol

D. NaCl

243. The first eukarotes appeared about __________ years ago?
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A. 1.5 billion

B. 3.5 billion

C. 4.5 billion

D. 2.5 billion

244. The one that stores calcium is __________?
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A. Sarcolemma

B. Sarcoplasmic reticulum

C. Sarcoplasm

D. Cytosol

245. The stent energy in the form of ADP is regenerated by mitochondria into__________?
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A. ATP

B. AMP

C. All of these

D. ADP

246. Who opposed the idea the cell is an empty space bounded by thick wall?
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A. Lorenz Oken

B. Rudolph Virchow

C. Schwann

D. Robert Brown
247. The mechanism of stomatal movement is related to the branch of Biology called__________?
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A. Morphology

B. Physiology

C. Taxonomy

D. Anatomy

248. In humans the number of tetrads formed during mitosis is___________?
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A. 4

B. 23

C. 46

D. 0
249. The one which is a weed killer is___________?
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A. 2 4-D

B. IAA

C. NAA

D. GA

250. Yellowish glandular structure which produces progesterone is_____________?
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A. Corpus luteum

B. Ovary

C. Graffian follicle

D. Placenta

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