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------ is an important property of antifreeze proteins present in certain fish
EXPLANATION
Fish Muscle Proteins & Structural Biochemistr
- Antifreeze Proteins (AFPs) in Polar Fishes:
- Polar and cold-temperate marine teleosts (such as Antarctic notothenioids, Arctic sculpins, and winter flounder) survive in icy seawater (down to $-1.9^\circ\text{C}$) due to Antifreeze Proteins (AFPs) and Antifreeze Glycoproteins (AFGPs).
- Thermal Hysteresis: AFPs adsorb specifically to emerging ice crystal prism faces via non-colligative mechanisms (Kelvin effect), pinning step growth and depressing the non-equilibrium freezing point without altering the equilibrium melting point.
- The temperature difference between the non-equilibrium freezing point and melting point is known as thermal hysteresis (typically $1.0-2.5^\circ\text{C}$).
- Correct Option: Option 1 (Thermal hysteresis).
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