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Answer:
E. As a component of animal cell membranes.
Explanation:
In the animal cell membrane, cholesterol exists as lipid molecules termed as steroid. Cholesterol is made up of hydrocarbon chains and the bond and size of these chains determine the flexibility of the membrane.
Cholesterol also controls the permeability of the plasma membrane by being specific to certain ions or molecules. Cholesterol plays major function in signal transduction of the cell.
The phospholipids present in the plasma membrane are also stabilized by the cholesterol.
Primary syphilis can be diagnosed by seeing bacterial filled chancre in the genital area. Not all patients exhibit this sign.
Answer:
fertilizer running off from a large agricultural farm
Explanation:
Fertilizers are normally used to enhance plant growth. However, when fertilizer runs off from a large agricultural farm, it could lead to severe ground water pollution due to nitrate and phosphate contamination of underground water.
It could also lead to excessive growth of weds in other areas. The fertilizer may also be transmitted along the food chain.