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Biochemistry - 3 Questions
Iodine is a characteristic component of Thyroxine
VLDL is a lipoprotein particle synthesized in the liver and secreted into the bloodstream to transport endogenously synthesized triglycerides and cholesterol to peripheral tissues. The triglycerides in VLDL are derived from fatty acids synthesized in the liver, and the cholesterol is derived from both dietary sources and de novo synthesis in the liver. They are not usually linked covalently to apoproteins (Answer 1), nor do they primarily consist of phosphatidylcholine (Answer 2). While the types of lipids found in the diet (Answer 4) can influence the liver's synthesis of VLDL, the statement does not accurately describe the direct composition of VLDL.
Saturated fatty acids are a type of fat that has a chemical structure with a single bond between each carbon atom in the fatty acid chain and no double bonds. These types of fats are typically solid at room temperature. Out of the given options, stearic acid (C18:0) is the only saturated fatty acid. The others are: 1. Oleic acid (C18:1) is a monounsaturated fatty acid, which means it has one double bond. It is commonly found in olive oil, canola oil, and avocados. 2. Linolenic acid (C18:3) is a polyunsaturated fatty acid, specifically an omega-3 fatty acid, with three double bonds. It is found in plant sources like flaxseeds, chia seeds, and walnuts. 3. Arachidonic acid (C20:4) is also a polyunsaturated fatty acid, an omega-6 fatty acid with four double bonds. It is found in animal fats, such as meat, and in smaller amounts in some plant oils like sunflower oil and peanut oil. Stearic acid, on the other hand, is a common saturated fatty acid found in various animal fats and certain vegetable oils like coconut oil, palm kernel oil, and cocoa butter. It is known for its role in the structure of cell membranes and as a precursor for the biosynthesis of cholesterol in the body. While it is important to consume fatty acids for good health, excessive consumption of saturated fatty acids has been associated with higher levels of LDL (low-density lipoprotein) cholesterol, which is often referred to as "bad" cholesterol, and an increased risk of heart disease. However, it is important to maintain a balanced diet that includes both saturated and unsaturated fatty acids in moderation.
MCQ