Regarding lipoproteins: A) HDL promotes coronary artery disease B) The higher the ratio of lipid to protein, the higher the density C) LDL proportionately has more protein to lipids D) LDL is promotes coronary artery disease E) none are true
To determine the correct answer about lipoproteins, let's go through each option:
A) HDL (high-density lipoprotein) actually helps protect against coronary artery disease. HDL is often referred to as the "good" cholesterol because it helps remove excess cholesterol from the arteries and transport it back to the liver for elimination. So, option A is not correct.
B) The higher the ratio of lipid to protein, the lower the density of a lipoprotein. Lipoproteins are named based on their density, with HDL being higher in density and LDL being lower in density. So, option B is not correct.
C) LDL (low-density lipoprotein) has a higher proportion of lipids (cholesterol and triglycerides) compared to proteins. LDL is often referred to as the "bad" cholesterol because it can contribute to the development of atherosclerosis, which is a buildup of cholesterol-rich plaques in the arteries. So, option C is correct.
D) This contradicts the information provided earlier. LDL, not HDL, is commonly associated with promoting coronary artery disease. So, option D is not correct.
Based on the explanations above, the correct answer is E) none are true. Only option C is true, which states that LDL proportionately has more protein to lipids.