MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1275 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________? |
| A. | Cytosol |
| B. | Cisternae |
| C. | Polysomes |
| D. | Cristae |
| Answer» C. Polysomes | |
| 202. |
Resolution power of a compound microscope is___________? |
| A. | 2.0 ?m |
| B. | 2-4 A |
| C. | 24 ?m |
| D. | 24 A |
| Answer» B. 2-4 A | |
| 203. |
Strengthening material of prokaryotic cell wall is__________? |
| A. | Cellulose |
| B. | Chitin |
| C. | Inorganic salts silica waxes and ligin |
| D. | Peptidoglycan or Murein |
| Answer» E. | |
| 204. |
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 |
| Answer» E. | |
| 205. |
Test cross is used to find_____________? |
| A. | Trait |
| B. | Phenotype |
| C. | Genotype |
| D. | Ratios |
| Answer» D. Ratios | |
| 206. |
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 |
| Answer» E. | |
| 207. |
Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________? |
| A. | Ribosomes |
| B. | Cytoplasm |
| C. | Golgi apparatus |
| D. | Endoplasmic reticulum |
| Answer» D. Endoplasmic reticulum | |
| 208. |
All of the following are elements that plants need in very small amounts except___________? |
| A. | Iron |
| B. | Hydrogen |
| C. | Chlorine |
| D. | Copper |
| Answer» C. Chlorine | |
| 209. |
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? |
| A. | Biome |
| B. | Phyletic lineage |
| C. | Community |
| D. | Population |
| Answer» C. Community | |
| 210. |
Starch is converted into maltose by? |
| A. | diastase |
| B. | invertase |
| C. | maltase |
| D. | amylase |
| Answer» B. invertase | |
| 211. |
Protein factory is___________? |
| A. | nucleus |
| B. | ribosome |
| C. | golgi complex |
| D. | centriole |
| Answer» C. golgi complex | |
| 212. |
In golgi apparatus the maturing face is____________? |
| A. | Biconcave |
| B. | Convex |
| C. | Spherical |
| D. | Concave |
| Answer» E. | |
| 213. |
Embryonic induction is caused by part developing from_____________? |
| A. | Endoderm |
| B. | Ectoderm |
| C. | Mesoderm |
| D. | Extraembryonic layers |
| Answer» D. Extraembryonic layers | |
| 214. |
In which of the following location enzymes controlling cellular respiration are present____________? |
| A. | Nucleus |
| B. | Chlorophast |
| C. | Milochondria |
| D. | Ribosome |
| Answer» D. Ribosome | |
| 215. |
Sickle cell anemia is an example of_________________? |
| A. | Chromosomal aberration |
| B. | Insertion of gene |
| C. | Deletion of gene |
| D. | Point mutation |
| Answer» E. | |
| 216. |
The type of plastids which help in pollination is_________? |
| A. | Chromoplasts |
| B. | Leucoplasts |
| C. | Chloroplasts |
| D. | All of these |
| Answer» B. Leucoplasts | |
| 217. |
Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________? |
| A. | F.Miescher |
| B. | Chargaff |
| C. | Watson & Crick |
| D. | Harshay & Chase |
| Answer» C. Watson & Crick | |
| 218. |
Chlorophyll is a/an _____ molecule? |
| A. | Inorganic |
| B. | Cationic |
| C. | Anionic |
| D. | Organic |
| Answer» E. | |
| 219. |
Yellow cytoplasm in ascidian gives rise to______________? |
| A. | Epidermis |
| B. | Muscle cells |
| C. | Gut |
| D. | Notochord |
| Answer» C. Gut | |
| 220. |
An example of codominance is______________? |
| A. | A’ blood group |
| B. | B’ blood group |
| C. | O’ blood group |
| D. | AB’ blood group |
| Answer» E. | |
| 221. |
Number of nuclear pores/nucleus in an RBC are_________? |
| A. | 1?3 |
| B. | 3?4 |
| C. | 10000 |
| D. | 30000 |
| Answer» C. 10000 | |
| 222. |
Sapwood is formed from_____________? |
| A. | Primary xylem |
| B. | Secondary xylem |
| C. | Primary phloem |
| D. | Secondary phloem |
| Answer» C. Primary phloem | |
| 223. |
Which of the following hormone is polypeptide in nature____________? |
| A. | Insulin |
| B. | Thyroxine |
| C. | ADH |
| D. | Cortisone |
| Answer» D. Cortisone | |
| 224. |
In human female, fertilization commonly occurs at______________? |
| A. | Proximal part of oviduct |
| B. | Distal part of oviduct |
| C. | Uterus |
| D. | Cervix |
| Answer» B. Distal part of oviduct | |
| 225. |
Highest form of learning is__________________? |
| A. | Latent learning |
| B. | Insight learning |
| C. | Operant conditioning |
| D. | Instinct |
| Answer» C. Operant conditioning | |
| 226. |
Ribosomes are assembled in__________? |
| A. | Nucleolus |
| B. | Nucleus |
| C. | DNA |
| D. | RNA |
| Answer» B. Nucleus | |
| 227. |
Far-red light promotes flowering in_______________? |
| A. | Short day plant |
| B. | Long day plant |
| C. | Day neutral plant |
| D. | None of these |
| Answer» B. Long day plant | |
| 228. |
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 |
| Answer» E. | |
| 229. |
Only myosine is present in_____________? |
| A. | A band |
| B. | 1 band |
| C. | H zone |
| D. | Sarcomere |
| Answer» D. Sarcomere | |
| 230. |
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 |
| Answer» B. One involved in internal cell motion. | |
| 231. |
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 |
| Answer» C. Co-transport | |
| 232. |
Which of the following is most constant abiotic component of ecosystem___________? |
| A. | Air |
| B. | Water |
| C. | Land |
| D. | Gravity |
| Answer» E. | |
| 233. |
Ecosystem not found in Pakistan is_____________? |
| A. | Tropical rain forest |
| B. | Temperate deciduous forest |
| C. | Grassland |
| D. | Tundra |
| Answer» B. Temperate deciduous forest | |
| 234. |
Pollen grains in pinus have __________ for dispersal through wind? |
| A. | Flagella |
| B. | Cilia |
| C. | Wings |
| D. | Feathers |
| Answer» D. Feathers | |
| 235. |
The productivity of aquatic ecosystem is basically determined by light and____________? |
| A. | CO2 |
| B. | O2 |
| C. | Water |
| D. | Nutrients |
| Answer» E. | |
| 236. |
95% of the cytoplasm of RBCs is____________? |
| A. | Hemoglobin |
| B. | Enzymes |
| C. | Salts |
| D. | Other proteins |
| Answer» B. Enzymes | |
| 237. |
Cuticular transpiration is _____________ of total transpiration? |
| A. | 1-2% |
| B. | 3-4% |
| C. | 5-7% |
| D. | 90% |
| Answer» D. 90% | |
| 238. |
_________________ cells of phloem are directly involved in transport of organic solutes? |
| A. | Parenchyma |
| B. | Companion cell |
| C. | Tracheid |
| D. | Sieve element |
| Answer» E. | |
| 239. |
According to cohesion-tension theory, tension is created by__________________? |
| A. | Hydrogen bonding |
| B. | Transpiration |
| C. | Adhesion |
| D. | Root prerssure |
| Answer» C. Adhesion | |
| 240. |
Deoxygenated blood first enters in _________ part in fishes? |
| A. | Sinus venosus |
| B. | Right atrium |
| C. | Left atrium |
| D. | Conus arteriosus |
| Answer» B. Right atrium | |
| 241. |
Red to orange pigments are_____________? |
| A. | Carotenes |
| B. | Carotenoids |
| C. | Xanthophylls |
| D. | Chlorophyll |
| Answer» B. Carotenoids | |
| 242. |
Ozone depletion occurs commonly due to_______________? |
| A. | Carbon dioxide |
| B. | Chlorofluorocarbons |
| C. | UV rays |
| D. | Deforestation |
| Answer» C. UV rays | |
| 243. |
Gaseous exchange in birds occurs at level of_______________? |
| A. | Alveoli |
| B. | Air sacs |
| C. | Bronchi |
| D. | Parabronchi |
| Answer» E. | |
| 244. |
Animals of which class of arthropoda are present everywhere_____________? |
| A. | Crustacean |
| B. | Insecta |
| C. | Arachnida |
| D. | Myriapoda |
| Answer» C. Arachnida | |
| 245. |
Reverse transcriptase is present in____________? |
| A. | All RNA viruses |
| B. | All DNA viruses |
| C. | All retroviruses |
| D. | All viruses |
| Answer» D. All viruses | |
| 246. |
______________ of earth surface is covered with water? |
| A. | 10% |
| B. | 30% |
| C. | 75% |
| D. | 90% |
| Answer» D. 90% | |
| 247. |
Alternation of generations is absent in___________? |
| A. | Hydration |
| B. | Obelia |
| C. | Jelly fish |
| D. | Physalia |
| Answer» B. Obelia | |
| 248. |
Which one is not correct for a productive theory________? |
| A. | It is predictive |
| B. | It has explanatory power |
| C. | It discourages suggestion of different hypotheses |
| D. | None of these |
| Answer» D. None of these | |
| 249. |
Destruction of all life forms is called___________? |
| A. | Sterilization |
| B. | Disinfection |
| C. | Antisepsis |
| D. | Preservation |
| Answer» B. Disinfection | |
| 250. |
Pox viruses are_________? |
| A. | RNA non-enveloped |
| B. | RNA enveloped |
| C. | DNA non-enveloped |
| D. | DNA enveloped |
| Answer» E. | |