Biology MCQs with Answers for Tests

biology mcqs with answers
biology mcqs with answers
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Biology MCQs with Answers

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Biology MCQs with Answers

201. Salivary glands present in front of ear are___________?

A. Sublingual
B. Submaxillary
C. Submandibular
D. Parotid

202. How many spiracles are present in cockroach_____________?

A. 5
B. 10
C. 20
D. 40

203. Which of the following is the correct sequence in the biological method?

A. Observation? hypothesis? law? theory
B. Observation? hypothesis? deduction? testing of deduction
C. Hypothesis? observation? deduction? testing of deduction
D. law? theory? deduction? observation

204. Amphibians are considered to be evolved from___________?

A. Newts
B. Varanope
C. Dipnoi
D. Hagfishes

205. Enterobius vermicularis is commonly known as____________?

A. Flatworm
B. Pinworm
C. Hook worm
D. Tapeworm

206. Red to orange pigments are_____________?

A. Carotenes
B. Carotenoids
C. Xanthophylls
D. Chlorophyll

207. Animals of which class of arthropoda are present everywhere_____________?

A. Crustacean
B. Insecta
C. Arachnida
D. Myriapoda

208. Gaseous exchange in birds occurs at level of_______________?

A. Alveoli
B. Air sacs
C. Bronchi
D. Parabronchi

209. ______________ of earth surface is covered with water?

A. 10%
B. 30%
C. 75%
D. 90%

210. An antibody is made of _________ polypeptide chains?

A. 1
B. 2
C. 3
D. 4

211. 95% of the cytoplasm of RBCs is____________?

A. Hemoglobin
B. Enzymes
C. Salts
D. Other proteins

212. _________________ cells of phloem are directly involved in transport of organic solutes?

A. Parenchyma
B. Companion cell
C. Tracheid
D. Sieve element

213. An infectious disorder of respiratory system is_________________?

A. Cancer
B. Asthma
C. Tuberculosis
D. Emphysema

214. Cuticular transpiration is _____________ of total transpiration?

A. 1-2%
B. 3-4%
C. 5-7%
D. 90%

215. According to cohesion-tension theory, tension is created by__________________?

A. Hydrogen bonding
B. Transpiration
C. Adhesion
D. Root prerssure

216. Deoxygenated blood first enters in _________ part in fishes?

A. Sinus venosus
B. Right atrium
C. Left atrium
D. Conus arteriosus

217. Ozone depletion occurs commonly due to_______________?

A. Carbon dioxide
B. Chlorofluorocarbons
C. UV rays
D. Deforestation

218. Who coined the term CELL?

A. Schwann
B. Schleiden
C. Robert Hook
D. Both a and b

219. “lubb” sound is produced due to___________________?

A. Opening of inlet valve
B. Closure of inlet valve
C. Opening of outlet valve
D. Closure of outlet valve

220. In condition of high temperature, following does not occur or occurs at low level__________?

A. Vasodilation
B. Activation of sweat glands
C. Thermogenesis
D. Evaporative cooling

221. Who first observed and thus hypothesized that new cells are formed from previously existing living cell?

A. Theodor Schwann and Schleiden
B. Rudolph Virchows
C. Louis Pasteur
D. Both b and c

222. In Hardy-Weinberg formula P2 represents frequency of_____________?

A. Recessive allele
B. Dominant allele
C. Homozygous dominant individual
D. Homozygous recessive individual

223. _____________ supported theory of special creation?

A. Linnaeus
B. Aristotle
C. Mendel
D. Lamarck

224. Percentage of proteins in cell membrane is____________?

A. 20-40%
B. 40-50%
C. 60-80%
D. 80-100%

225. Which of the following is most constant abiotic component of ecosystem___________?

A. Air
B. Water
C. Land
D. Gravity

226. Ecosystem not found in Pakistan is_____________?

A. Tropical rain forest
B. Temperate deciduous forest
C. Grassland
D. Tundra

227. Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?

A. Active transport
B. Passive transport
C. Co-transport
D. Counter transport

228. The productivity of aquatic ecosystem is basically determined by light and____________?

A. CO2
B. O2
C. Water
D. Nutrients

229. The first layer of cell wall which is formed is___________?

A. Primary wall
B. Secondary wall
C. Middle lamella
D. All of these

230. Annual rainfall in grassland is about_____________?

A. More than 2500 mm
B. 750-1500 mm
C. 250-750 mm
D. Less than 250 mm

231. Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?

A. Rhizobium
B. Nitrosomonas
C. Nitrobacter
D. Pseudomonas

232. Cellulose is the major component of__________?

A. Primary wall
B. Secondary wall
C. Middle lamella
D. all of the above

233. Humming bird is an example of________________?

A. Cold blooded animal
B. Ectotherm
C. Endotherm
D. Heterotherm

234. Number of cervical vertebrae is_____________?

A. 5
B. 7
C. 9
D. 12

235. Autophagosomes are____________?

A. Those lysosomes which eat parts of their own cells to generate energy.
B. Those lysosomes which eat old and worn out cellular organelles.
C. Lysosomes which help in extracellular digestion
D. Both a and b

236. Sapwood is formed from_____________?

A. Primary xylem
B. Secondary xylem
C. Primary phloem
D. Secondary phloem

237. Which of the following cytoskeletal fiber contain tubulin protein?

A. One which help in assembly of spindles during mitosis.
B. One involved in internal cell motion.
C. One involved in maintenance of cell shape.
D. Both b and c

238. Only myosine is present in_____________?

A. A band
B. 1 band
C. H zone
D. Sarcomere

239. Joints present in skull are example of_______________?

A. Fibrous joints
B. Cartilaginous joints
C. Synovial Joints
D. Slightly moveable joints

240. The human naked eye can differentiate between two points which are __________ apart?

A. 1.0 mm
B. 0.1 mm
C. 1.0 cm
D. 1.0 dm

241. _____________ is a nervous disorder characterized by involuntary tremors, diminished motor power and rigidity?

A. Epilepsy
B. Meningitis
C. Alzheimer’s disease
D. Parkinson’s disease

242. Of the following which one is not the characteristic of mitochondria?

A. It contains F1 particles
B. It is involved in the synthesis of protein
C. It is a self replicating organelle
D. Number of mitochondria is constant

243. In human female, fertilization commonly occurs at______________?

A. Proximal part of oviduct
B. Distal part of oviduct
C. Uterus
D. Cervix

244. The part of chloroplast where CO2 is fixed to manufacture sugar is__________?

A. Stroma
B. Grana
C. Thylakoid
D. Outer membrane

245. Highest form of learning is__________________?

A. Latent learning
B. Insight learning
C. Operant conditioning
D. Instinct

246. Which of the following hormone is polypeptide in nature____________?

A. Insulin
B. Thyroxine
C. ADH
D. Cortisone

247. Ribosomes are assembled in__________?

A. Nucleolus
B. Nucleus
C. DNA
D. RNA

248. Far-red light promotes flowering in_______________?

A. Short day plant
B. Long day plant
C. Day neutral plant
D. None of these

249. Which of the following is not present in mitochondria?

A. Enzymes
B. Co-enzymes
C. Ribosomes
D. Thylakoids

250. Secretin inhibits production of__________________?

A. Gastric juice
B. Pancreatic juice
C. Bile
D. All of these

251. Yellowish glandular structure which produces progesterone is_____________?

A. Graffian follicle
B. Ovary
C. Corpus luteum
D. Placenta

252. The stent energy in the form of ADP is regenerated by mitochondria into__________?

A. AMP
B. ADP
C. ATP
D. All of these

253. On which of the following component of chloroplast chlorophyll is arranged?

A. Cell membrane
B. Matrix
C. Thylakoids
D. Stroma

254. An example of codominance is______________?

A. A’ blood group
B. B’ blood group
C. O’ blood group
D. AB’ blood group

255. Test cross is used to find_____________?

A. Trait
B. Phenotype
C. Genotype
D. Ratios

256. Number of nuclear pores/nucleus in an RBC are_________?

A. 1?3
B. 3?4
C. 10000
D. 30000

257. Yellow cytoplasm in ascidian gives rise to______________?

A. Epidermis
B. Muscle cells
C. Gut
D. Notochord

258. Chlorophyll molecule contrains __________ as central metal ion.

A. Fe2+
B. Mg2+
C. Zn2+
D. Cu2+

259. Okazaki fragments are connected together through action of_________________?

A. Primase
B. Polymerase
C. Helicase
D. Ligase

260. Which of the following combination is an example of self replicating organelles?

A. Mitochondria Ribosomes
B. Mitochondria Nucleus
C. Mitochondria Chloroplast
D. Mitochondria Vacuole

261. Which of the following is an autosomal disorder______________?

A. Down’s syndrome
B. Klinifelter’s syndrome
C. Turner’s syndrome
D. Jacob’s syndrome

262. The place of centromere where spindle fibres get attached is_________?

A. Kinetochore
B. Kinochore
C. Centromere region
D. all of these

263. Embryonic induction is caused by part developing from_____________?

A. Endoderm
B. Ectoderm
C. Mesoderm
D. Extraembryonic layers

264. Sickle cell anemia is an example of_________________?

A. Chromosomal aberration
B. Insertion of gene
C. Deletion of gene
D. Point mutation

265. The type of plastids which help in pollination is_________?

A. Chromoplasts
B. Leucoplasts
C. Chloroplasts
D. All of these

266. Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________?

A. F.Miescher
B. Chargaff
C. Watson & Crick
D. Harshay & Chase

267. Chlorophyll is a/an _____ molecule?

A. Inorganic
B. Cationic
C. Anionic
D. Organic

268. Ribonucleo-protein particles are the name of__________?

A. DNA
B. Nucleus
C. Eukaryotic ribosomes
D. RNA

269. Lock and Key model was proposed by______________?

A. Emil Fischer
B. Koshland
C. Robin Williams
D. Rudolph Virchow

270. Which step causes activation of catalytic site of an enzyme__________________?

A. Change in pH of the surroundings.
B. Formation of Enzyme Susstrate complex.
C. Change in the charge of the active site.
D. Change in temperature

271. Amoeboid movements and movement of cyclosis is due to_________?

A. Microfilaments
B. Microtubules
C. Intermediate filaments
D. Cytoskeleton

272. Enzymes __________________ the activation energy of a chemical reaction?

A. Increases
B. Decreases
C. Does not effect
D. Increases or decreases depending upon individual enzyme

273. Which one forms the raw material for coenzymes_______________________?

A. Vitamins
B. Carbohydrates
C. Proteins
D. Metals

274. Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________?

A. Ribosomes
B. Cytoplasm
C. Golgi apparatus
D. Endoplasmic reticulum

275. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?

A. Cofactor
B. Coenzymes
C. Activator
D. Enzymes

276. In which of the following location enzymes controlling cellular respiration are present____________?

A. Nucleus
B. Chlorophast
C. Milochondria
D. Ribosome

277. In golgi apparatus the maturing face is____________?

A. Biconcave
B. Convex
C. Spherical
D. Concave

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

A. Prosthetic group
B. Coenzyme
C. Activator
D. Cofactor

279. An activated enzyme consisting of polypeptide chain and a cofactor is called_______________?

A. Apoenzyme
B. Holoenzyme
C. Activated enzyme
D. Both b and c

280. Centrioles are composed of ________ triplets of microtubules.

A. 3
B. 9
C. 10
D. 15

281. Which statement about enzyme is incorrect_________________?

A. Some of them consist solely of protein with no non protein part.
B. They catalyze a chemical reaction without being utilized.
C. All enzymes are fibrous Proteins.
D. They without their cofactor are called apoenzyme.

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

A. Active site
B. Binding site
C. Catalytic site
D. Allosteric site

283. Cellular organelles related with H2O2 are___________?

A. Glyoxisomes
B. Lysosomes
C. Peroxisomes
D. Ribosomes

284. If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?

A. There is probably more substrate present than there is enzyme.
B. There is probably more enzayme available than there is substrate.
C. There is probably more product present than there is either substrate or enzyme.
D. The enzyme substrate complex is probably failing to form during the reaction

285. A group of ribosomes attached to mRNA is known as___________?

A. Polymer
B. Polypeptide
C. Polysomes
D. Monomer

286. The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?

A. Increase in enzyme molecule increases the available active sites.
B. This relation is for unlimited time period with unlimited enzyme concentration
C. If the concentration is doubled the rate will become two fold.
D. None of these.

287. Which statement is incorrect about Lock and Key Model________________?

A. Specific enzyme can transform only a specific substrate
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. It explains the mechanism of every chemical reaction

288. 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____________________?

A. Enzymes get denatured at higher substrate conc
B. Rate of reaction is indirectly proportional to substrate concentration at this point
C. All the active sites on enzyme molecule are occupied
D. None of these

289. The active site of an enzyme______________?

A. Never changes
B. Forms no chemical bond with substrate
C. Determined by structure and the specificity of the enzyme
D. They are non specific in their action

290. Factory of Ribosomal systhesis is__________?

A. Cytoplasm
B. Nucleus
C. Nucleolus
D. Endoplasmic reticulum

291. If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?

A. Saturation
B. Denaturation
C. Composition
D. Inhibition

292. Who opposed the idea the cell is an empty space bounded by thick wall?

A. Lorenz Oken
B. Schwann
C. Robert Brown
D. Rudolph Virchow

293. Extreme change in pH results in______________?

A. Change in ionization of amino acids at the active site of the enzyme
B. Change in the ionization of the substrate
C. Denaturation of the enzyme
D. Increase in the reaction rate

294. Resolution power of a compound microscope is___________?

A. 2.0 ?m
B. 2-4 A
C. 24 ?m
D. 24 A

295. Excessive increase in temperature of medium causes the enzyme molecule to____________?

A. Activate
B. Unaffected
C. Denatured
D. None of these

296. If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?

A. increase in concentration of enzyme
B. increase in concentration of substrate
C. increase in pH
D. increase in temperature

297. In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?

A. Their physical properties like size & weight.
B. Physical properties of the medium like its density.
C. Their electrical properties like their charges
D. Both a and b

298. The structure of an enzyme is altered by____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

299. Malonic acid is an example of____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

300. Magnifying power of electron microscope as compared to eye is____________?

A. 500 X
B. 250000X
C. 500000X
D. 250X

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