Consider the following statements for metallothioneins:A. the contain about 30% cysteine residuesB. they prefer to bind soft metal ions such as Cd(II), Hg(II) and Zn(II)C. they are involved in electron transfer reactionsD. they are low molecular weight proteinsCorrect statements are
(a)A, B and C
(b)A, B and D
(c)A, C and D
(d)B and C
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Metallothioneins are small (~6–7 kDa), about 30 % cysteine, and bind soft ions (Zn, Cd, Hg, Cu). They are storage/detoxification proteins, not electron carriers. A, B and D (b).