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MCQOPTIONS
This section includes 200950 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 12151. |
Huntington’s chorea appears at the age of : |
| A. | 25-55 years |
| B. | 15-25 years |
| C. | 50-60 years |
| D. | 10-15 years |
| Answer» B. 15-25 years | |
| 12152. |
Crossing over in diploid organisms is responsible for |
| A. | Dominance of genes |
| B. | Linkage between genes |
| C. | Recombination of linked genes |
| D. | segregation of alleles |
| Answer» D. segregation of alleles | |
| 12153. |
Which amino acid is substituted in sickle cell anaemia. |
| A. | Glutamic acid by valine in β−chain |
| B. | Glutamic acid by valine in α−chain |
| C. | Valine by glutamic acid in β−chain |
| D. | Valine by glutamic acid in α−chain |
| Answer» B. Glutamic acid by valine in α−chain | |
| 12154. |
Epistasis in which dihybrid ratio of 9:3:3:1 between Aa Bb ×AaBbis modified is.. |
| A. | dominance of one allele on another allele at the same locus |
| B. | dominance of one allele on another allele at both its loci |
| C. | interaction of two alleles at different loci |
| D. | interaction between two alleles at same locus |
| Answer» C. interaction of two alleles at different loci | |
| 12155. |
If Mendel had studied 7 traits using a plant with 12 chromosomes instead of 14, he would have. |
| A. | discovered incomplete dominance |
| B. | not discovered the law of independent assortment |
| C. | discovered sex linkage |
| D. | mapped the chromosome |
| Answer» C. discovered sex linkage | |
| 12156. |
Persons with Klinefelter’s syndrome have chromosomes : |
| A. | XX |
| B. | XY |
| C. | XXY |
| D. | XYY |
| Answer» D. XYY | |
| 12157. |
Nerve cell does not divide because they do not have: |
| A. | Nucleus |
| B. | Centrosome |
| C. | Golgi body |
| D. | Mitochondria |
| Answer» C. Golgi body | |
| 12158. |
During strenuous exercise; glucose is converted into: |
| A. | Glycogen |
| B. | Pyruvic acid |
| C. | Starch |
| D. | Lactic acid |
| Answer» E. | |
| 12159. |
A cross between homozygous recessive and heterozygous plant is: |
| A. | Monohybrid cross |
| B. | Dihybrid cross |
| C. | Test cross |
| D. | Back cross |
| Answer» D. Back cross | |
| 12160. |
‘AIDS’ is due to: |
| A. | Destruction of killer-T-cells |
| B. | Destruction of helper-T-cells |
| C. | Lack of interferons |
| D. | Autoimmunity |
| Answer» C. Lack of interferons | |
| 12161. |
Intercalated disc is found in: |
| A. | Muscles of heart |
| B. | Vertebrae |
| C. | Muscles of legs |
| D. | Public symphysis |
| Answer» B. Vertebrae | |
| 12162. |
Which of following is ‘immortal’? |
| A. | Somatic cell |
| B. | Glomerular cells |
| C. | Germ cells |
| D. | Cells of pituitary |
| Answer» D. Cells of pituitary | |
| 12163. |
Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as: |
| A. | Antibiosis |
| B. | commensalisms |
| C. | Predation |
| D. | Parasitism |
| Answer» C. Predation | |
| 12164. |
‘Heart, of heart’ is: |
| A. | SA node |
| B. | AV node |
| C. | Bundle of His |
| D. | Purkinje fibers |
| Answer» B. AV node | |
| 12165. |
Which of the following is phagocytic? |
| A. | Monocytes |
| B. | RBC |
| C. | Eosinophil |
| D. | Basophil |
| Answer» B. RBC | |
| 12166. |
Exoskeleton is absent in: |
| A. | Scoliodon |
| B. | Frog |
| C. | Rabbit |
| D. | Fowl |
| Answer» C. Rabbit | |
| 12167. |
Flame cells are excretory organ of: |
| A. | Planaria |
| B. | Hydra |
| C. | Hydrilla |
| D. | Cockroach |
| Answer» B. Hydra | |
| 12168. |
Carapace is present on the dorsal surface of: |
| A. | Elephant |
| B. | Tortoise |
| C. | Python |
| D. | Alligator |
| Answer» C. Python | |
| 12169. |
Tube feet is the locomotory organ in: |
| A. | Starfish |
| B. | Jelly fish |
| C. | Silver fish |
| D. | Scoliodon |
| Answer» B. Jelly fish | |
| 12170. |
FSH is secreted by: |
| A. | Anterior lobe of pituitary |
| B. | Hypothalamus |
| C. | Gonads |
| D. | Posterior lobe of pituitary |
| Answer» B. Hypothalamus | |
| 12171. |
The biogenetic law of Haeckel is: |
| A. | Omnis vivum-e-vivum |
| B. | Omnis cellula-e-cellula |
| C. | Ontogeny repeats phylogeny |
| D. | Phylogeny repeats ontogeny |
| Answer» D. Phylogeny repeats ontogeny | |
| 12172. |
Which of the following vitamins is water soluble as well as anti-oxidant? |
| A. | Vitamin-B1 |
| B. | Vitamin-A |
| C. | Vitamin-D |
| D. | Vitamin-C |
| Answer» E. | |
| 12173. |
Transposons are: |
| A. | House-keeping genes |
| B. | Jumping genes |
| C. | Transporting genes |
| D. | Stationary genes |
| Answer» C. Transporting genes | |
| 12174. |
Thousands of years old mummies are still in their condition as they were before due to the non destruction of: |
| A. | Yellow elastic fibers |
| B. | White elastic fibers |
| C. | Collagen fibers |
| D. | Veins |
| Answer» B. White elastic fibers | |
| 12175. |
Two animal cells are interconnected by: |
| A. | Plasmodesmata |
| B. | Cell wall |
| C. | Desmosomes |
| D. | Plasma membrane |
| Answer» D. Plasma membrane | |
| 12176. |
Human ear ossicles are: |
| A. | Incus and stapes |
| B. | Stapes |
| C. | Incus, malleus and stapes |
| D. | Incus and malleus |
| Answer» D. Incus and malleus | |
| 12177. |
Which of the following amino acids is not optically active? |
| A. | Glycine |
| B. | Valine |
| C. | Leucine |
| D. | Isoleucine |
| Answer» B. Valine | |
| 12178. |
‘Adaptation’ of eyes in dark is due to: |
| A. | Depletion of vision pigment in rod |
| B. | Depletion of vision pigment in cones |
| C. | Repletion of visior pigment in rods |
| D. | Repletion of vision pigment in cones |
| Answer» D. Repletion of vision pigment in cones | |
| 12179. |
All of the following phrases could characterize a population except.. |
| A. | dispersion. |
| B. | density. |
| C. | boundaries. |
| D. | several species. |
| Answer» E. | |
| 12180. |
Tree of life is: |
| A. | Arbor vitae |
| B. | Pons varolii |
| C. | Organ of Corti |
| D. | Diencephalons |
| Answer» B. Pons varolii | |
| 12181. |
Sea gulls excrete excess of NaC1 from: |
| A. | Liver |
| B. | Lungs |
| C. | Nasal cavity |
| D. | Kidney |
| Answer» D. Kidney | |
| 12182. |
A biologist reported that a sample of ocean water had 5 million diatoms of the species Coscinodiscus centralis per cubic meter. What was the biologist measuring? |
| A. | range |
| B. | dispersion |
| C. | density |
| D. | carrying capacity |
| Answer» D. carrying capacity | |
| 12183. |
How would the dispersion of humans in the United States best be described? |
| A. | clumped |
| B. | random |
| C. | uniform |
| D. | dense |
| Answer» B. random | |
| 12184. |
The most common kind of dispersion in nature is.. |
| A. | uniform. |
| B. | clumped. |
| C. | dispersive. |
| D. | random. |
| Answer» C. dispersive. | |
| 12185. |
To measure the population density of monarch butterflies occupying a particular park, 100 butterflies arecaptured, marked with a small dot on a wing, and then released. The next day, another 100 butterflies are captured, including the recapture of 20 marked butterflies. One would correctly estimate the population to be. |
| A. | 500 |
| B. | 200 |
| C. | 1,000 |
| D. | 900,000 |
| Answer» B. 200 | |
| 12186. |
Life history strategies result from |
| A. | natural selection. |
| B. | environmental pressures. |
| C. | conscious choice. |
| D. | both A and B. |
| Answer» E. | |
| 12187. |
The pattern of dispersion for a certain species of kelp is clumped. The pattern of dispersion for a certain species of snail that lives only on this kelp would likely be. |
| A. | clumped. |
| B. | demographic. |
| C. | random. |
| D. | absolute. |
| Answer» B. demographic. | |
| 12188. |
Uniform spacing patterns in plants such as the creosote bush are most often associated with which of the following? |
| A. | the random distribution of seeds |
| B. | the concentration of resources within the population’s range |
| C. | antagonistic interactions among individuals in the population |
| D. | patterns of high humidity |
| Answer» D. patterns of high humidity | |
| 12189. |
A table listing such items as age, observed number of organisms alive each year, and life expectancy is known as a.. |
| A. | insurance table. |
| B. | life table. |
| C. | survivorship table. |
| D. | rate table. |
| Answer» C. survivorship table. | |
| 12190. |
A demographer studying a population of a particular organism would be least likely to be engaged in which of the following? |
| A. | constructing a life table for the organism |
| B. | sampling the population and determining the sex ratio |
| C. | estimating how long an individual of a given age will live |
| D. | studying courtship behavior between males and females |
| Answer» E. | |
| 12191. |
Which of the following would be most likely to exhibit uniform dispersion? |
| A. | cattails, which grow primarily at edges of lakes and streams |
| B. | dwarf mistletoes, which parasitize particular species of forest trees |
| C. | tassel-eared squirrels, which are nonterritorial |
| D. | red squirrels, which hide food and actively defend territories |
| Answer» E. | |
| 12192. |
Which of the following statements about human birth and death rates in populations is correct? |
| A. | Death rates are highest in the elderly, whereas birth rates are highest in newborns. |
| B. | Death rates are highest in middle-aged adults, whereas the birth rates are highest in teenagers. |
| C. | Death rates are highest in newborns and in the elderly, whereas birth rates are highest in 20-year-olds. |
| D. | Both death rates and birth rates are highest in teenagers. |
| Answer» D. Both death rates and birth rates are highest in teenagers. | |
| 12193. |
Organisms in which of the following taxa are responsible for most of the conversion of organic materials into inorganic compounds that can be utilized in primary production? |
| A. | autotrophs |
| B. | bacteria |
| C. | fungi |
| D. | B and C |
| Answer» E. | |
| 12194. |
Production, consumption, and decomposition are important ecosystem processes. Organisms in which of the following taxa perform decomposition? |
| A. | invertebrates |
| B. | bacteria |
| C. | vertebrates |
| D. | A, B, and C |
| Answer» E. | |
| 12195. |
The fundamental difference between materials and energy is that |
| A. | energy is cycled through ecosystems; materials are not. |
| B. | materials are cycled through ecosystems; energy is not. |
| C. | materials can be converted into energy; energy cannot be converted into materials. |
| D. | energy can be converted into materials; materials cannot be converted into energy. |
| Answer» C. materials can be converted into energy; energy cannot be converted into materials. | |
| 12196. |
Which of the following is a life history characteristic that would not be associated with big-bang reproduction? |
| A. | death of the parent following reproduction |
| B. | a life cycle that may require a number of years of maturing before reproduction |
| C. | many gametes produced at reproductive maturity |
| D. | repeated reproductive events over a long life span |
| Answer» E. | |
| 12197. |
A cow’s herbivorous diet indicates that it is a.. |
| A. | secondary consumer. |
| B. | primary consumer. |
| C. | decomposer. |
| D. | autotroph. |
| Answer» C. decomposer. | |
| 12198. |
The main decomposers in an ecosystem are: |
| A. | fungi. |
| B. | plants. |
| C. | insects. |
| D. | A and C. |
| Answer» E. | |
| 12199. |
Which of these ecosystems has the highest primary productivity per square meter? |
| A. | open ocean |
| B. | tropical rain forest |
| C. | boreal forest |
| D. | temperate forest |
| Answer» C. boreal forest | |
| 12200. |
Which of these ecosystems accounts for the largest amount of Earth’s primary productivity? |
| A. | open ocean |
| B. | savanna |
| C. | tundra |
| D. | salt marsh |
| Answer» B. savanna | |