Question

"The amino acid lysine has an amino group in its side chain. In a protein, a scientist replaced every lysine with serine (side chain -CH2OH). The alteration made the protein's folding ...

A. more sensitive to pH.
B. less dependent on hydrogen bonds.
C. less sensitive to heat.
D.less sensitive to pH.
E. more dependent on amino acid sequence."

Answer 1

Replacing lysine with serine in a protein's side chains makes the protein's folding more sensitive to pH.

Step-by-step explanation:

The amino acid lysine has a positively charged amino group in its side chain, making it a basic amino acid. When lysine is replaced with serine, which has a hydroxyl group (–OH) in its side chain, the protein's folding will be A. more sensitive to pH.