NEET BIOLOGY

Detailed explanation-1: -Steroids are fat-soluble and nonpolar molecules that are found in every biological system. It has a fused ring structure and is a precursor to various biomolecules such as cholesterol, testosterone, progesterone, etc. Steroids are not considered true lipids.

Detailed explanation-2: -Lipids are compounds that are insoluble in water but are soluble in organic solvents such as ether and chloroform.

Detailed explanation-3: -Steroid hormones are lipid soluble, allowing them to diffuse through the plasma membrane. The actions of steroid hormones can be exerted via nuclear hormone receptors (which are typically slow genomic actions).

Detailed explanation-4: -Human hormones testosterone and estrogen are considered lipids.

Detailed explanation-5: -The answer is d. All lipids contain fatty acids. The statement that is not true is choice (d) All lipids contain fatty acids. Not all lipids contain fatty acid molecules.