Cholesterol belongs to which class of molecules?
a. protein
b. lipids
c. carbohydrates
d. nucleic acids

   Lipids

Explanation:  Cholesterol is a type of lipid, in addition to triglycerides, which are simply fats. Cholesterol can be found in meat, so in all types of meat with fat, then in egg yolk, etc. In fact, cholesterol is half the lipid half protein, and there are some types of cholesterol known as lipoproteins, so cholesterol spreads through the body inside the lipoprotein, The high amount of cholesterol in the body is harmful, it can contribute to many diseases.  However, there is a so-called "good" cholesterol that helps transport cholesterol through the liver out of the body and thus does not accumulate in the arteries. The accumulation of harmful cholesterol in the arteries leads to obesity, high blood pressure, heart disease, etc.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.