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Consider the following statements for metallothioneins:
A. the contain about 30% cysteine residues
B. they prefer to bind soft metal ions such as Cd(II), Hg(II) and Zn(II)
C. they are involved in electron transfer reactions
D. they are low molecular weight proteins
Correct statements are
  • a)
    A, B and C 
  • b)
    A, B and D
  • c)
    A, C and D 
  • d)
    B and C
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements for metallothioneins:A. the contain ...
Metallothioneins are cystein rich, low molecular weight protein. Due to soft sulfur centre they prefer to bind.
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Community Answer
Consider the following statements for metallothioneins:A. the contain ...
Explanation:
Metallothioneins are a group of small, cysteine-rich proteins that have a high affinity for binding metal ions.

Statement Analysis:

A. Cysteine Residues: Metallothioneins contain a high percentage of cysteine residues, typically around 30%. Cysteine residues are important for metal binding due to the thiol group they contain.

B. Preference for Soft Metal Ions: Metallothioneins prefer to bind soft metal ions such as Cd(II), Hg(II), and Zn(II). Soft metal ions have a high affinity for thiol groups present in cysteine residues.

C. Involvement in Electron Transfer Reactions: Metallothioneins are not typically involved in electron transfer reactions. Their primary function is metal ion storage and regulation.

D. Low Molecular Weight: Metallothioneins are indeed low molecular weight proteins, typically consisting of around 60-70 amino acids.

Correct Answer:
The correct statements are A, B, and D. Metallothioneins contain a high percentage of cysteine residues, prefer to bind soft metal ions, and are low molecular weight proteins.
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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 area)A, B and Cb)A, B and Dc)A, C and Dd)B and CCorrect answer is option 'B'. Can you explain this answer?
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