Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Life Sciences Cellular Organization Membrane structure and function
Consider the following statement:
"The fluidity of cellular membranes is influenced by several factors including temperature, the saturation level of fatty acids in phospholipids, and the presence of cholesterol within the membrane."
Based on this statement, which of the following options best describes how these factors affect membrane fluidity?
1
Increasing temperature decreases membrane fluidity because molecules move slower and interact more tightly.
2
Saturated fatty acids increase membrane fluidity because they have no double bonds and pack loosely.
3
Cholesterol decreases membrane fluidity at high temperatures and increases it at low temperatures by modulating the movement of phospholipid molecules.
4
Unsaturated fatty acids decrease membrane fluidity because the kinks in their chains allow them to pack more tightly.
5
Question Not Attempted