【简答题】Fish contains lost of omega-3 fatty acids.These fatty acids have been shown to help pr heart disease,lower blood pressure and reduce the risk of strokes.Researchers suggest that these benefits of...
【简答题】阅读理解。 Fish contains lost of omega-3 fatty acids. These fatty acids have been shown to help pr heart disease, lower blood pressure and reduce the risk of strokes. Researchers suggest that these be...
【多选题】What occurs during desaturation of fatty acids?
A.
Palmitate and stearate serve as precursors of the two most common monounsaturated fatty acids of animal tissues: palmitoleate, 16:1(Δ 9 ), and oleate, 18:1(Δ 9 ); both of these fatty acids have a single cis double bond between C-9 and C-10.
B.
The double bond is introduced into the fatty acid chain by an oxidative reaction catalyzed by fatty acyl–CoA desaturase, a mixed-function oxidase. Two different substrates, the fatty acid and NADPH, simultaneously undergo twoelectron oxidations.
C.
The path of electron flow includes a cytochrome (cytochrome b 5 ) and a flavoprotein (cytochrome b 5 reductase), both of which, like fatty acyl–CoA desaturase, are in the smooth ER.
D.
In plants, oleate is produced by a stearoyl-ACP desaturase (SCD) that uses reduced ferredoxin as the electron donor in the chloroplast stroma.