This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Sustainable Marine Food Production Systems”.
1. CECs refer to contaminants of emerging concern.
a) True
b) False
View Answer
Explanation: Contaminants of emerging concern (CECs) arise from such industrial sources as pharmaceuticals, plasticizers, pyrethroids (insecticides) and end up in water bodies. Depending upon the concentration of CECs lethal effects are observed on aquatic organisms.
2. P450 is not synthesized by _______________ in fish.
a) swim bladder
b) skin
c) eyes
d) spleen
View Answer
Explanation: Cytochrome P450 is a hemeprotein that plays an instrumental role in metabolism of xenobiotics and contaminants of emerging concerns. It is synthesized by blood, eyes, spleen, and skin (fins) of fish.
3. Choose the appropriate option.
| 1. FC-E | a. Xenobiotic detoxification |
| 2. FC-X | b. Secondary metabolites catabolism |
| 3. FC-S | c. Endogenous compound degradation |
a) 1-c, 2-a, 3-b
b) 1-c, 2-b, 3-a
c) 1-a, 2-b, 3-c
d) 1-b, 2-c, 3-a
View Answer
Explanation: There are three classes of cytochrome P450 (CYP) based on the role in physiology. FC-X is involved in degradation of xenobiotics, FC-S in biosynthesis and catabolism of secondary metabolites, and FC-E in degradation of such endogenous compounds as hormones, prostaglandins, and vitamins.
4. Antioxidants of mainly two types.
a) True
b) False
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Explanation: Antioxidants against reactive oxygen species (ROS) are mainly of two types – lipophilic, including vitamin E, β-carotene, ubiquinone, vitamin A; and water soluble including vitamin C, catecholamines, uric acid, thiols.
5. Nitrifying bacteria are outgrown by heterotrophic bacteria when ______________
a) ammonia level drops
b) oxygen level drops
c) biosolids accumulate
d) pH elevates
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Explanation: Nitrifying bacteria are outcompeted and outgrown by heterotrophic bacteria because the formers growl slowly compared to the latter. When carbon-rich biosolids accumulate in the culture system, population of heterotrophic bacteria increases tremendously.
6. Biofloc system is ___________________
a) suspended growth biofilter
b) attached growth biofilter
c) gas-to-liquid aerator
d) liquid-to-gas aerator
View Answer
Explanation: Biofloc is the term given to suspended or freely growing nitrifying bacteria which along with such organisms as protozoa, silicates, and algae in a rich ecosystem. All the organisms, fecal matter, and uneaten feed flocculate together.
7. Choose the correct option.
| 1. Suspended growth biofilters | a. require post-treatment |
| 2. Attached growth biofilters | b. large surface area |
| c. fixed bed bioreactor |
a) 1-a, 2-b, 2-c
b) 1-b, 2-c, 2-a
c) 1-c, 2-a, 2-b
d) 1-a, 2-a, 2-b
View Answer
Explanation: There are two types of nitrifying biofilters used in recirculating aquaculture systems (RAS) – suspended growth and attached growth biofilters. Suspended growth biofilters require a post treatment because nitrifying bacteria are lost after culture water leaves the bioreactor.
8. Which of the following has high energy requirements?
a) Moving bed bioreactor
b) Fluidized sand bioreactor
c) Fixed bed bioreactor
d) Trickling filters
View Answer
Explanation: The main aim of biofilters in RAS is to increase the water quality parameters while having less energy requirements. Trickling filters are a type of attached growth nitrifying biofilters that have high power input requirements.
More MCQs on Sustainable Marine Food Production Systems:
- Sustainable Marine Food Production Systems MCQ (Set 2)
- Sustainable Marine Food Production Systems MCQ (Set 3)
- Sustainable Marine Food Production Systems MCQ (Set 4)
- Sustainable Marine Food Production Systems MCQ (Set 5)
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
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