In Gas Chromatography-Mass Spectrometry (GC-MS), gaseous compounds separated by the GC capillary column enter the mass spectrometer ion source where they are ionized and fragmented.
The resulting charged molecular ions and fragments are separated and quantified by the mass analyzer (quadrupole, time-of-flight, or ion trap) strictly on the basis of their mass-to-charge ratio ($m/z$).
Correct Option: Option 3 (Mass to charge ratio of the component).
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Q.77
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
The sets of amino acids which facilitate chemical modification leading to improved protein functionalities
The side-chain functional groups of specific amino acids facilitate chemical modifications to improve solubility, emulsification, and gel-forming functional properties:
Lysine (Lys): Possesses an accessible reactive $\varepsilon$-amino group ($-NH_2$) for acylation, succinylation, and phosphorylation.
Cysteine (Cys): Possesses a reactive sulfhydryl ($-SH$) group for disulfide cross-linking and redox tailoring.
Tryptophan (Trp): Contains an electron-rich indole ring susceptible to mild chemical modification.
Correct Option: Option 3 (Lys, Cys, Trp).
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Q.78
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
------- is one of the important mesopelagic fish species that have been tried for value addition but have failed due to their
unique lipid composition
Mesopelagic fishes of the family Myctophidae (lanternfishes) represent an enormous global biomass ($100-500\text{ million tonnes}$ in the Arabian Sea).
However, commercial attempts to utilize myctophids directly for human food have largely failed because their lipids are dominated by wax esters ($\gt 80\%$ of total lipids). Wax esters cannot be hydrolyzed by human intestinal lipases, causing severe gastrointestinal distress (keriorrhea / oily diarrhea).
Correct Option: Option 1 (Myctophidae sp.).
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Q.79
Fish Processing Technology- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
The antioxidants a-tocopherol and astaxanthin act by one of the following mechanisms
Antioxidant Action of $\alpha$-Tocopherol and Astaxanthin:
$\alpha$-Tocopherol (Vitamin E) and Astaxanthin (a red keto-carotenoid) act as chain-breaking biological antioxidants in fatty fishes and crustaceans.
Mechanism: They neutralize lipid peroxidation by directly scavenging reactive oxygen species (ROS) and reactive oxygen intermediates (ROM), donating phenolic hydrogen atoms to convert lipid peroxyl radicals ($LOO^\bullet$) into stable hydroperoxides and quenching excited singlet oxygen ($^1O_2$).
Correct Option: Option 2 (Scavenging reactive ROS and ROM species).
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In fishes, Vitamin D is predominantly present in the form of Cholecalciferol (Vitamin $D_3$).
Fatty fish species (salmon, mackerel, sardines) and fish liver oils accumulate substantial amounts of cholecalciferol synthesized endogenously or obtained via the marine planktonic food web.
Ergocalciferol (Vitamin $D_2$) is the plant/fungal provitamin form.
Correct Option: Option 2 (Cholecalciferol).
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