biology Mcqs
201. Cytoskeleton involved in assembly and disassembly of the spindle during mitosis is of_________?
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A. None of these

B. Intermediate filaments

C. Microtubules

D. Microfilaments

202. A large regional community primarily determined by climate is called ?
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A. Biome

B. Population

C. Community

D. Habitat

203. ___________ is the potential surce of chemical energy for cellular activities?
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A. C-H bond

B. C-O bond

C. P-O-C bond

D. C-N bond

204. An unbroken series of species arranged in ancestors to descendent sequence with each later species having evolved from one that immediately preceded it is called?
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A. Phyletic lineage

B. Population

C. Community

D. Biome

205. Group of living organisms of the same species living in the same place at the same time is called________?
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A. Community

B. Biome

C. Ecosystem

D. Population
206. So far over _____________ number of species of animals are known?
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A. million

B. 2 million

C. 1

D. 1 million

207. Double fertilization occurs in_________?
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A. All seed plants

B. Gymnosperms

C. All plants

D. Angiosperms
208. helical structure is kept by the formation of _________ bonds among amino acids molecules?
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A. Hydrophobic bonds

B. Disulphide Bond

C. H bonds

D. Ionic bond

209. Ecosystem not found in Pakistan is_____________?
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A. Grassland

B. Temperate deciduous forest

C. Tundra

D. Tropical rain forest
210. A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?
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A. Blocker

B. Co-enzyme

C. Cofactor

D. Inhibitor
211. A genome is___________?
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A. All of these

B. Genetic basis of few characters

C. Appearance of an individual

D. Full set of genes of an individual
212. The discease in which transmembrane carrier for the chloride ion is not produced is__________?
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A. Hyperchloesterolemia

B. Cystic fibrosis

C. Severe combined immunodeficiency syndrome

D. AIDS

213. In most ecosystems the greatest amount of energy flows through the____________?
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A. Carnivores

B. Herbivores

C. Secondary consumers

D. Decomposers

214. Each turn of DNA contain ____________ nitrogenous base pairs?
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A. 10

B. 20

C. 5

D. 25

215. _____________ supported theory of special creation?
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A. Lamarck

B. Linnaeus

C. Mendel

D. Aristotle

216. The structure of an enzyme is altered by____________?
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A. Reversible inhibitor

B. Non-competitive inhibitor

C. Irreversible inhibitor

D. Competitive inhibitor

217. If a plasmolysed plant cell is placed in water the cell will___________?
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A. Show no change in it

B. Be Killed

C. Be deplasmolysed

D. Burst

218. DNA or RNA of viruses is enclosed in _______________ coat?
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A. DNA

B. Protein

C. Carbohydrate

D. Lipid

219. The one which is incorrect pair?
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A. Lycopods Ground pries

B. Dichotomous Vernation

C. Arthrophytes Jointed

D. Sori Indusium

220. Embryonic induction is caused by part developing from_____________?
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A. Extraembryonic layers

B. Ectoderm

C. Mesoderm

D. Endoderm

221. Sickle cell anemia is an example of_________________?
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A. Deletion of gene

B. Insertion of gene

C. Chromosomal aberration

D. Point mutation
222. ____________% of Glucose normally present in our blood is?
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A. 1.80%

B. 0.08%

C. 8%

D. 0.80%

223. Hemoglobin molecule exhibits which structural organization of proteins___________?
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A. Quaternary structure

B. Secondary structure

C. Primary structure

D. Tertiary structure

224. Which chemical component has the same % in bacterial as well as the mammalian cell_____________?
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A. Lipids

B. Carbohydrate

C. Proteins

D. Water
225. Number of cervical vertebrae is_____________?
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A. 7

B. 12

C. 9

D. 5

226. Which one is soluble in hot water_____________?
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A. Amylopectin.

B. Glycogen

C. Starch

D. Amylose
227. Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?
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A. Active transport

B. Co-transport

C. Counter transport

D. Passive transport
228. Which one gives blue colour with iodine_______________?
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A. Glycogen

B. Polysaccharide

C. Cellulose

D. Starch
229. Following possess bilateral symmetry as larva and radial symmetry as adult:
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A. Chordata

B. Hydra

C. Hemichordata

D. Echinodermata
230. One celled green ptotists are included in___________?
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A. Monera

B. Slime molds

C. Algae

D. Plants

231. Which of the following statement is incorrect5 for fats containing unsaturated fatty acid_____________?
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A. They are lighter than water

B. They are usually solid at room temperature

C. Their specific gravity is less than 1

D. They contain double bond

232. Which one of the following syndrome is the result of meiotic non dysjunction?
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A. Turners syndrome

B. Klinefelters syndrome

C. All of these

D. Downs syndrome

233. Primary structure of proteins determines__________?
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A. Bending of polypeptide chains

B. Amino acid sequence

C. Coiling of polypeptide chains

D. Number of polypeptide chains involved

234. The property of water due to which it works as a temperature stabilizer and hence protect living organisms from sudden thermal changes is_______________?
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A. Its Dipole nature

B. High specific heat of vaporization

C. Its liquid state

D. High specific heat capacity
235. The basic structural unit of a chromosome is____________?
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A. The centromere

B. Histone

C. Nuceleosome

D. Telomere

236. Which of the following carbohydrate is tasteless___________?
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A. Monosaccharide

B. None of these

C. Polysaccharide

D. Oligosaccharide

237. The one which can break open a plasmid ring is__________?
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A. Ligase enzyme

B. ATP-ase enzyme

C. Restriction endonuclease

D. Primase enzyme

238. Yellow cytoplasm in ascidian gives rise to______________?
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A. Muscle cells

B. Epidermis

C. Gut

D. Notochord

239. Optimal temperature of enzymes present in human body is_____________?
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A. 47?C

B. 30?C

C. 27?C

D. 37?C
240. Keto group is represented as___________?
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A. CO

B. HOH

C. C-COO-C

D. HCOH

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