Lipids, Fats, and Biochemistry

Amino acids are the molecular building blocks that link together to form proteins through peptide bonds. When we eat protein-rich foods, our bodies break them down into amino acids for absorption and use. Carbohydrates, fats, and vitamins are important nutrients but do not contain amino acids.

Mustard oil, coconut oil, sunflower oil and nut oil are sources of fats.

Water is a compound of hydrogen and oxygen only and it does not release energy. 

Statement 1 is incorrect because beta-oxidation occurs in mitochondria (not glyoxysomes) in animals, and in glyoxysomes in plants, not 'only' in glyoxysomes. Statement 2 is also incorrect because beta-oxidation produces BOTH NADH and FADH2, not just NADH. Each cycle produces one NADH, one FADH2, and one acetyl-CoA. Therefore BOTH statements are wrong, making option D correct.

Fats are broken down by lipase enzymes into fatty acids and glycerol. Fatty acids are the primary end products of fat digestion, along with glycerol. Amino acids come from proteins, starch is a carbohydrate, and glucose is a simple sugar.

Glucose is the primary fuel for cellular respiration, producing ATP through glycolysis and oxidative phosphorylation. While fats can provide energy, they require breakdown first. Proteins are primarily for building structures, and fructose must be converted to glucose for cellular use.

Stearic acid is the saturated fatty acid with an 18 carbon chain and has the IUPAC name 'octadecanoic acid'.

Adipose tissue is specialized connective tissue designed primarily for fat storage. It stores excess energy in the form of triglycerides (fats). Roughage refers to dietary fiber, vitamins are micronutrients needed in small amounts, and minerals are inorganic nutrients - none of which are stored in adipose tissue.

Vegetable oils like olive, sunflower, and canola oil are rich in unsaturated fatty acids, which are liquid at room temperature and considered heart-healthy. Milk and cheese contain mostly saturated fats, while coconut oil is unusually high in saturated fats despite being plant-based.

Fats act as thermal insulators by forming a layer beneath the skin that helps maintain body temperature and prevents heat loss. This is why marine mammals and animals in cold climates have thick fat layers (blubber). Carbohydrates and proteins primarily provide energy and building materials, while vitamins regulate various metabolic processes.

Fats serve multiple crucial functions: they provide concentrated energy (9 kcal/g), support brain development (especially in infants), and are essential for hormone production (including steroid hormones). Blood clotting is primarily mediated by platelets and clotting factors (dependent on vitamin K), not fats - making this the correct exception.

Palmitic acid is the most common saturated fatty acid found in animals, plants and microorganisms. It is a major component of the oil from palm trees (palm oil, palm kernel oil and coconut oil). However, palmitic acid can also be found in meats, cheese, butter and dairy products.

This is the correct answer. Adipose tissue stores fat and acts as an insulator.

Glucose is the primary energy source for cellular respiration, producing ATP through glycolysis and oxidative phosphorylation. While fats can provide energy, they're primarily storage molecules. Proteins are mainly used for building and repairing tissues, and fructose requires conversion to glucose before cellular use.