This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Shrimp Aquaculture – Set 2”.
1. Bacillus is used as a probiotic because it produces exoenzymes.
a) True
b) False
View Answer
Explanation: Bacillus species are a common probiotic used in aquaculture because of their ability to produce exoenzymes such as amylase, protease, and lipase among others. These provide a cumulative effect in maintaining water quality and therefore shrimp health.
2. The green phototrophic bacteria is _____________
a) gram positive
b) gram-negative
c) oxygenic
d) pathogenic
View Answer
Explanation: Phototrophic bacteria are broadly classified as oxygenic and anoxygenic phototrophic bacteria. The anoxygenic phototrophic bacteria that do not evolve oxygen are further divided into green sulfur bacteria and purple sulfur bacteria.
3. Choose the appropriate option.
| 1. Green sulfur bacteria | Photosynthetic pigments |
|---|---|
| 2. Purple sulfur bacteria | i. Bacteriochlorophylls a,c,d,e |
| ii. Bacteriochlorophyll a,b | |
| Sulfur deposition | |
| iii. inside of the cell | |
| iv. outside of the cell |
a) 1-I, 1-iv, 2-ii, 2-iii
b) 1-ii, 1-iii, 2-i, 2-iv
c) 1-iii, 1-iv, 2-ii, 2-i
d) 1-ii, 1-iv, 2-I, 2-iii
View Answer
Explanation: Green sulfur bacteria and purple sulfur bacteria are grouped into anoxygenic phototrophic bacteria. Sulfur is deposited outside the cell in green sulfur bacteria and inside the cell in purple sulfur bacteria.
4. Carotenoids in shrimp feed are important for _________________
a) pigmentation of the organism
b) alkalinity maintenance
c) antivibrio compound synthesis
d) antibiotic resistance
View Answer
Explanation: Carotenoids are sources of natural pigments in shrimp feed therefore these can greatly affect the color quality of the organism. This adds an additional factor in the cost of commercial shrimp feed.
5. Antimicrobial peptides of shrimp are produced and stored in __________________
a) Cortex
b) Hemocoel
c) Hemocytes
d) Paracortex
View Answer
Explanation: Antimicrobial peptides are the most important players of immune system in shrimps. These antimicrobial peptides are produced and stored in the hemocytes – immune cells of penaeid shrimps.
6. Cyanocobalamin is often added in shrimp feed.
a) True
b) False
View Answer
Explanation: Cyanocobalamin or vitamin B12 is added as a supplement in shrimp feed to promote growth and color intensity of the organism. It is also essential for human beings and certain species of sulfide oxidizing bacteria.
7. Select the correct option.
| 1. Reactive oxygen species | a. hydrogen peroxide |
| 2. Anti-oxidant defense | b. superoxide anion |
| c. glutathione | |
| d. ascorbic acid |
a) a-1, b-1, c-2, d-2
b) a-1, b-2, c-1, d-2
c) a-1, b-1, c-2, d-1
d) a-2, b-2, c-2, d-1
View Answer
Explanation: All vertebrates and invertebrates invariably produce reactive oxygen species (ROS) such as hydrogen peroxide and superoxide anion in response to environmental stress. Anti-oxidant defenses towards elevated ROS involve production of molecules such as glutathione and ascorbic acid.
8. Choose the correct option about cells.
| 1. B-cells | i. cuboidal, found in distal parts |
| 2. F-cells | ii. contain small lipid vacuoles |
| 3. R-cells | iii. show fibrillar appearance |
| 4. E-cells | iv. largest, located in distal part |
a) 1-iv, 2-iii, 3-ii, 4-i
b) 1-i, 2-ii, 3-iii, 4-iv
c) 1-ii, 2-iv, 3-i, 4-iii
d) 1-iii, 2-i, 3-iv, 4-ii
View Answer
Explanation: There are 4 types of cells in lumen of shrimp hepatopancreas (HP) namely the B-, F-, R-, and E-cells. Symptoms of early mortality syndrome (EMS) or acute hepatopancreas necrosis disease include changes in morphology of HP cells.
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.
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