Heterozygotes for erythropoietic protoporphyria show only 20 to 30% residual ferrochelatase activity rather than the 50% that is normally expected for an autosomal dominant inherited disease. Provide a plausible explanation for this observation.
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Heterozygotes for erythropoietic protoporphyria show only 20 to 30% residual ferrochelatase activity rather than the 50% that is normally expected for an autosomal dominant inherited disease. Provide a plausible explanation for this observation.
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- The plasma profiles of codeine (COD) and metabolites for 2 individuals (labeled A and B) are shown below. The X-axis is time in hours after an oral dose of codeine. [M=morphine; C6G=COD-6-glucuronide; M3G = morphine-3-glucuronide; NM (ignore)]. Note the data is shown on a log scale on the Y-axis. (A) Which individual is the poor metabolizer? Explain how you know this from the profiles? (B) Is this a problem for cough suppression? Explain. -CH HO Codeine COD 10 000 1000 C6G COD 100 M3G M6G NM 10 M 10 20 30 0 10 20 30 Plasma concentration (nmol I-)What is the molecular basis for methicillin resistance in certain strains of S. aureus (MRSA)?A) 43 14 When Friend erythroleukemic cells are incubated with sodium butyrate, they differentiate into nondividing, hemoglobin-synthesizing cells. Butyrate-induced differentiation is accompanied by accumulation of acety- lated forms of H3 and H4 histones, as can be seen most clearly for H4 in Fig- ure 4-16A. In principle, butyrate treatment could increase the activity of his- tone acetyl transferases (HATS) or decrease the activity of histone deacety- lase complexes (HDACs). To distinguish between these alternatives, HAT and HDAC activities were measured in the presence and absence of butyrate (Figure 4-16B and C). From these results decide how butyrate treatment causes accumulation of acetylated histones. butyrate (B) H-acetylated histone (cpm, thousands) N -butyrate + butyrate boiled 9 30 10 20 time (minutes) (C) C free 'H-acetate (cpm, thousands) S43210 boiled -butyrate +butyrate,