Chapter 9 Bearing this in mind, which of the three groups are likely to occur a)in greatest amounts, b)in lowest concentration in biological sy You should have predicted that the sterols are present in greatest quantity in biological stems. your knowledge of biology should have enabled you to identify the steroid hormones as being present in lowest concentrations since hormone, in general, are effective at very low concentrations sterols cholesterol bile salts COOH COOH (c2 24"steroids) cholic acid lithocholic acid steroid hormones Cn-steroids CH3 CH,OH c二 progesterone corticosterone cortisol C1 and C1a steroids H estradiol 17-p stradiol-17B Figure 9.1 Some examples of sterols, bile salts and steroids296 Chapter 9 Bearing this in mind, which of the three groups are likely to occur a) in greatest n amounts, b) in lowest concentration in biological systems? You should have predicted that the sterols are present in greatest quantity in biological systems. Your knowledge of biology should have enabled you to identify the steroid hormones as being present in lowest concentrations since hormone, in general, are effective at very low concentrations. Figure 9.1 Some examples of sterols, bile salts and steroids