This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Fish Genetics – Broodstock Development”.
1. Which does not regulate type and expression of transcripts?
a) Developmental stage
b) Physiology
c) Environment
d) Protein primary structure
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Explanation: The type and expression level of mRNA transcripts at any given point of time are regulated by interplay of external and internal factors. These include tissue specificity, developmental stage, physiology and environment.
2. The BRIDGEMAP project was aimed at genome analysis of ______________
a) sea bream
b) salmon
c) sea bass
d) salmonids
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Explanation: The BRIDGEMAP project funded by the European government was initiated in 2001 with three major objectives: construction of a framework genetic map of sea bream; development of basic genomic tools from sea bream; and construction of physical maps using BAC libraries.
3. A species is selected for culture if suitable techniques are available for controlled breeding.
a) True
b) False
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Explanation: A fish species or any other marine organism species is selected for culture if there are suitable techniques available for its controlled breeding. An alternate is to have ample supply of larvae or juvenile.
4. Which is not an important factor involved in regulation of fish reproductive cycles?
a) Photoperiod
b) Temperature
c) Rainfall
d) Feed type
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Explanation: In the fish reproduction cycles, environmental factors play the most important role. Photoperiod, temperature and rainfall are involved in initiation of the cycle by influencing the sensory receptors.
5. Vitellogenesis is dependent upon _______________
a) gonadotropin
b) hemoglobin
c) releasing hormone
d) growth hormone
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Explanation: Vitellogenesis is the process of synthesis of specific glycolipophosphoprotein – vitellogenin in the liver of females and its subsequent in oocytes following the release of gonadotropin, released by pituitary gland.
6. The gonadotropin that that induces vitellogenesis has _______________________
a) low carbohydrate content
b) high carbohydrate content
c) origin in hypothalamus
d) temperature sensitivity
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Explanation: In fish two gonadotropins (hormones released by the pituitary in response of releasing hormones of hypothalamus) have been studied. The one that promotes vitellogenesis has low carbohydrate content, and the other with high carbohydrate content induces maturation and ovulation.
7. Which technique works for the fishes that do not breed under conditions of confinement?
a) Trasngenesis
b) Transfusion
c) Rolling bottle
d) Hypophysation
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Explanation: Hypophysation is a technique developed in Brazil during 1935 to induce spawning for fishes that do not breed under captivity or require complex environmental conditions to breed. Pituitary hormones are injected in this process.
8. The growth-inhibiting hormone (GIH) in shrimp is stored in ________________
a) sinus gland
b) pancreas
c) liver
d) kidney
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Explanation: The growth inhibiting hormone (GIH) is synthesized by medulla terminalis ganglionic X organ (MTGX) and is stored in the sinus gland. Along with it the Y-organ secreted moult hormone crutecdysone also influences maturation.
9. Moult hormone in shrimp influences maturation.
a) True
b) False
View Answer
Explanation: Crutecdysone is the molt hormone in shrimp, secreted by the Y organ (molting gland of ectodermal origin). This is located on the opposite side of sinus gland. Both the glands negatively impact maturation in shrimps.
10. _______________ hormones are used in hypophysation.
a) Mammalian gonadotropic
b) Mammalian metabolic
c) Microbial metabolites
d) Immune-stimulating
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Explanation: Hyphophysation is the technique of injecting mammalian gonadotropic hormones such as luteinizing hormone (LH) and human chorionic gonadotropin (HCG). This boosts the natural surge of the gonadotropins.
11. Which is a universal pituitary donor?
a) Common carp
b) Chinese cark
c) Japanese ricefish
d) Atlantic salmon
View Answer
Explanation: Common carp and salmon are used as pituitary donors for almost all fish species in which maturation has to be induced through hypophysation. Pituitary extracts from fish work better than the mammalian pituitary.
12. Nucleus migration away from the center is a sign of __________________
a) ovum maturation
b) hypertrophy
c) atrophy
d) ovulation
View Answer
Explanation: Maturation of the ovum starts when the nucleus starts migrating from the center towards the micropyle and undergoes hydration by absorbing various fluids. This can be viewed microscopically after hormonal injections have been administered.
More MCQs on Broodstock Development:
- Broodstock Development MCQ (Set 2)
- Broodstock Development MCQ (Set 3)
- Broodstock Development MCQ (Set 4)
- Broodstock Development MCQ (Set 5)
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
To practice all areas of Marine Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
