Question

question 2
1 pts
the presence of cholesterol in the plasma membranes of some animals
enables the animal to remove hydrogen atoms from saturated phospholipids.
enables the animal to add hydrogen atoms to unsaturated phospholipids.
enables the membrane to stay fluid more easily when cell temperature drops.
makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.
makes the animal more susceptible to circulatory disorders.

Explanation:

Cholesterol in plasma membranes acts as a buffer. At lower temperatures, it prevents phospholipids from packing too tightly, thus maintaining membrane fluidity. The first two options are about hydrogenation/dehydrogenation which is not cholesterol's role here. The fourth option is incorrect as cholesterol's main role in membrane fluidity (not pressure - related in this context). The fifth option is too broad and not the main function related to membrane properties.

Answer:

enables the membrane to stay fluid more easily when cell temperature drops.