Lipids, Fats, and Biochemistry

It is a saturated fatty acid.

They control the permeability of the cell membrane. It is the chief constituent of the cell membrane.

Lipids exhibit all of the above listed properties.

Subcutaneous fat distribution contributes significantly to body contours, particularly in females where it helps create rounded contours and softer body outlines. This is a sexual dimorphism trait in human anatomy.

Enzymes are biological catalysts that speed up chemical reactions in living organisms. While most enzymes are proteins made of amino acid chains, a few are RNA molecules (ribozymes). The other options - vitamins, fats, and lipids - serve different biological functions: vitamins are organic compounds needed in small amounts, fats are energy storage lipids, and lipids are a broad category of hydrophobic molecules.

Muricholic acids are a group of bile acids found in mice.

Deoxycholic acid is a bile acid. Bacteria metabolise chenodeoxycholic acid into secondary bile acid lithocholic acid.

This is the correct option. Jaggery is a source of carbohydrates, and not fats.

Fats (lipids) are stored in cells in the form of triglycerides, which are composed of three fatty acids attached to a glycerol backbone. Polypeptides are protein chains, polysaccharides are complex carbohydrates, nucleosides are DNA/RNA components, and monosaccharides are simple sugars - none of these are fat storage forms.

Vaucheria stores its food reserves primarily in the form of oil droplets within its cytoplasm. This distinguishes it from many other algae that typically store carbohydrates as starch.

Phospholipids are the most abundant lipid class in blood plasma. They form the structural backbone of all lipoprotein particles (HDL, LDL, VLDL, chylomicrons) that transport lipids through the bloodstream. The amphipathic nature of phospholipids allows them to form stable spherical micelles that carry hydrophobic lipids in the aqueous blood plasma.

Fats are lipids that are soluble in organic solvents like alcohol, ether, and chloroform due to their nonpolar nature. The polar nature of water makes it incompatible with hydrophobic fat molecules, which is why fats and oils do not mix with water. Alcohol (ethanol) can dissolve fats because it has both polar and nonpolar regions, allowing it to interact with lipid molecules. This property is exploited in various extraction and purification processes.

Fibrates are actually better absorbed WITH food to enhance bioavailability and reduce GI side effects. The statement claiming better absorption on empty stomach is false. Fibrates activate PPAR-alpha, increase lipoprotein lipase activity, and are indeed first-line for type III hyperlipidemia and hypertriglyceridemia.

These are membrane derived second messengers. They play crucial roles in diverse cellular functions such as cell growth, apoptosis, cell migration, endocytosis, and cell differentiation.