Discussion
The molecular weight of prostate specific antigen is :
Answer: B
The molecular weight of prostate specific antigen is about 30 kDa.
PSA is a glycoprotein secreted by the prostate into seminal fluid. In forensic serology it was first described as p30, a name that comes from its molecular weight of about 30 kilodaltons (measured values run to about 33-34 kDa). Its detection, for example by immunochromatographic test strips, confirms the presence of semen even when no sperm are found.
25, 35 and 40 kDa are not the values given for PSA; the p30 name is the easy way to remember the correct one.
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