1. Toxic agents are those which enters in the body of organisms and cause damages and toxicity in these inhabitants. These agents are of ______ types.
a. 4
b. 5
c. 2
d. 3
Correct Answer: c
.2. Clinically significant isoforms of CYP450 are axcept
a. CYP3!3
b. CYP3A3
c. CYP111
d. CYP222
Correct Answer: b
.3. Deletion fusion involve in which mechanism
a. Inactivation
b. Genotoxic
c. Mutagenic mechanism
d. Antimutagenic mechanism
Correct Answer: d
.4. Due to mercury toxicity tens or even hundreds of peoples are died in ________ incident ____year____.
a. Minamata, Japan, 1956
b. George M. Robinson, 1960s
c. Heroshema nagasaki, japan, 1956
d. Wuhan, china 1956
Correct Answer: a
.5. Our globe contains_______ % freshwater and ________ % marine water.
a. 2, 98
b. 2, 97
c. 2.8, 97.2
d. 3, 97
Correct Answer: c
.6. Changes in swimming pattern of fish after successful exposure with toxicant is observed within
a. Last 5 hrs
b. First 5 hrs
c. First 7 hrs
d. Last 7 hrs
Correct Answer: b
.7. Which type of water contains less amount of Dissolved oxygen
a. Moderate water
b. hot and warm water
c. Cold water
d. Hot water
Correct Answer: b
.8. High blood pressure,iron poor blood & nerve demages in aquatic organisms is caused by toxicity
a. Copper
b. Lead
c. Zinc
d. Cadmium
Correct Answer: d
.9. Organisms takes up a substance in its tissues faster than its expel called
a. None
b. Bioaugmentation
c. Biofilamentation
d. Bioaccumulation
Correct Answer: d
.10. High concentration of Zinc in Aquatic inhabitants like fish’s causes____________.
a. None of these
b. Lamellar hyperpelsia
c. Lamellar thickening
d. Lamella hyperpelsia
Correct Answer: b
.11. Which of the following type toxicity can occur due to single exposure
a. Less acute
b. Chronic
c. Sub chronic
d. Acute toxicity
Correct Answer: d
.12. The most common target organ of toxicity is the
a. Heart
b. Lungs
c. Kidney
d. Brain and Spinal cord
Correct Answer: d
.13. Change in behavior growth reproduction uptake and detoxification activity and tissue structure is called_______.
a. Sublethal effect
b. Suborganismal effect
c. Reproductive effect
d. None of these
Correct Answer: a
.14. The LD50 is best described as the dose at which 50% of all test animal
a. None
b. Die
c. Not Die
d. Not effected
Correct Answer: b
.15. water pollution that can be traced to a specific origin
a. Point source
b. Non point source
c. specific source
d. origin
Correct Answer: a
.16. Roughly_______of the methyl mercury enters the food web.
a. 0.3
b. 0.4
c. 0.1
d. 0.2
Correct Answer: c
.17. The molecule of Metallothionein (MT) is made up of how many amino acids.
a. 44
b. 54
c. 61
d. 51
Correct Answer: c
.18. Changes in the circulating regulatory and responder____are good indicators of an autoimmune response induced by an immunotoxic agent.
a. T cell
b. Antibody
c. B-cells
d. Puss cells
Correct Answer: a
.19. Bioaccumulation tests are performed on the type of ________ chemicals. Those accumulates in fatty tissues of aquatic organisms
a. toxicity
b. Hydrophobic
c. Hydrophillic
d. Heavy metals
Correct Answer: b
.20. Exact exposure time and time duration will be depending on?
a. Type of test
b. Type of organisms
c. Type of environment
d. Type of species
Correct Answer: a
.21. Which of the fallowing enzyme use in oil industory?
a. Amylase
b. Lipase
c. Protease
d. Gastrin
Correct Answer: b
.22. Of our lakes are polluted and unfit for swimming, fishing, and drinking
a. 1 by 10
b. 1 by 1.1
c. 1 by 3
d. 1 by 5
Correct Answer: c
.23. Lethal concentration that reduces the normal response of an organism by 50%, estimated by graphical or computational means
a. EC50
b. LC50
c. IC50
d. LD50
Correct Answer: b
.24. Hard water contains ________ concentration of calcium carbonate.
a. 90mg/l
b. 80mg/l
c. 100mg/l
d. 80-100mg/l
Correct Answer: d
.25. The main function of MT is to regulate the metabolically important metals such as______.
a. Pb
b. Cu and Zn
c. Al
d. Cu
Correct Answer: b
.26. The safe concentration for lifetime consumption is
a. 1*10-33
b. 1*10-66
c. 1*10-7
d. 1*10 -55
Correct Answer: c
.27. The main purpose of the_________ response is to immediately prevent the spread and movement of foreign pathogens throughout the body.
a. B-lymphocytes
b. Innate Immunity
c. Adaptive immunity
d. T-lymphocytes
Correct Answer: b
.28. _________metal disturb the semi permeability of cell membrane.
a. Zinc
b. Cadmium
c. Silver
d. Copper
Correct Answer: d
.29. The oysters are zinc powerhouse that packs in ….. per medium zinc.
a. 66 mg per
b. 99.4 mg per
c. 5.3 mg per
d. 44.4 mg per
Correct Answer: c
.30. The molecular mass of metalthionine is__________.
a. 4-6KDa
b. 2-4KDa
c. 6-8KDa
d. 8-10KDa
Correct Answer: c
.31. From combustion process which toxin is produced
a. Aesbestos
b. Dioxins
c. Monoxins
d. Trioxin
Correct Answer: b
.32. which of the following is an indicator of organic water pollution?
a. COD
b. pH
c. Salinity
d. BOD
Correct Answer: d
.33. According to EPA,rivers water are nearly toxic about
a. 0.3
b. 0.2
c. 0.5
d. 0.4
Correct Answer: c
.34. when contamination occurs from a single sourse is called
a. Point source
b. Industrial source
c. None of these
d. Non point source
Correct Answer: a
.35. Acute test are not valid if mortality in the control sample is greater than
a. 0.3
b. 0.2
c. 0.1
d. 0.5
Correct Answer: c
.36. Short term sublethal test are used to evaluate the toxicity of
a. Terrestrial
b. Desert
c. None of these
d. Aquatic Organism
Correct Answer: d
.37. Daphinia test used along with the
a. aAquatic bird
b. Fish 96 hrs
c. Marine algea
d. Amphibian
Correct Answer: b
.38. The P450 superfamily is believed to have originated from an ancestral gene that existed over________.
a. 5 billion years ago
b. 6 billion years ago
c. 3 billion years ago
d. 4 billion years ago
Correct Answer: c
.39. Adaptive immunity is found only in
a. Vertebrates
b. Mammal
c. Molluscs
d. Non vertebrates
Correct Answer: a
.40. Immunotoxicity in invertebrates have been studied in mainly
a. Molluscs
b. Vertebrates
c. Birds
d. Non vertebrates
Correct Answer: a
.41. The chemical DIOXIN effects on
a. Sterility
b. Immune system
c. Memory Loss
d. Bones
Correct Answer: b
.42. Bone weakening is due to
a. Mercury
b. Iron
c. Chlorine
d. Cadmium
Correct Answer: d
.43. Genetic toxicology was first published in
a. 1790
b. 1997
c. 1987
d. 1887
Correct Answer: c
.44. In the eukaryotic organisms,the damage of the genetic material cause the
a. Diabeties
b. Hemophilia
c. Syndrome
d. Cancer
Correct Answer: d
.45. DDT bind to the androgen receptors,and prevent the normal function of
a. Testosteron
b. Aldosterone
c. Estrogen
d. Cartison
Correct Answer: a
.46. The damage of _____may lead to heritable diseases.
a. Sperm
b. Germ cells
c. Somatic cells
d. Ovum
Correct Answer: b
.47. ___________bioassays have been widely used in toxicity assessment.
a. Physiological
b. Biochemical
c. Molecular
d. Behavioral
Correct Answer: d
.48. The fish metallothionine has more metal exchange capability than:
a. Amphibian MT
b. Mammalin MT
c. Reptile MT
d. Bird MT
Correct Answer: b
.49. The term ecotoxicology was coined by _________ in ___________.
a. Rene Truhaut, 1969
b. None Of these
c. Rene Truhaut, 1967
d. Rene Truhaut, 1967
Correct Answer: a
.50. DDT was first introduced in world war II ,and well known effects on
a. Fishes
b. Amphibian
c. Reptiles
d. Bird
Correct Answer: d
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