Question

addition of a phosphate group to a protein increases the proteins potential energy. which statements about addition of phosphate are likely accurate? select all that apply.

addition of phosphate is a spontaneous process that does not require coupling with other reactions.

the negative charges in phosphate can repel neighboring r - groups. eventually changing the shape of the protein.

the phosphate group makes hydrophobic interactions with neighboring r - groups.

the increased potential energy after phosphate addition can be used by the protein to do work in the cell.

Explanation:

• Phosphorylation (addition of phosphate) is not a spontaneous process; it requires energy (usually from ATP), so the first statement is incorrect.
• Phosphate groups are negatively charged. They can repel other negatively - charged or polar R - groups, which can lead to a change in protein shape (conformation). So the second statement is correct.
• Phosphate groups are hydrophilic (due to their negative charges and polar bonds), not hydrophobic. So the third statement is incorrect.
• When a phosphate is added to a protein, increasing its potential energy, this energy can be used for work in the cell (e.g., in signal transduction pathways where a phosphorylated protein can then interact with other molecules more effectively). So the fourth statement is correct.

Answer:

• Second statement: "The negative charges in phosphate can repel neighboring R - groups, eventually changing the shape of the protein."
• Fourth statement: "The increased potential energy after phosphate addition can be used by the protein to do work in the cell."