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

Explanation:

• First statement: When a phosphate group is added to a protein, the increased potential energy can be harnessed for cellular work. This is similar to how ATP (adenosine triphosphate) donates phosphate groups to drive endergonic reactions in cells.
• Second statement: Adding a phosphate group to a protein is an endergonic process (requires energy input). It must be coupled with an exergonic reaction (like ATP hydrolysis) to occur, so this statement is incorrect.
• Third statement: Phosphate groups are negatively charged. In a protein, these negative charges can repel neighboring R - groups (side chains of amino acids). This electrostatic repulsion can lead to a change in the protein's three - dimensional shape (conformation).
• Fourth statement: Phosphate groups are hydrophilic (water - loving) due to their negative charges and ability to form hydrogen bonds. Hydrophobic interactions are characteristic of non - polar groups. So, phosphate groups do not make hydrophobic interactions with neighboring R - groups.

Answer:

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