His thoughts lingered over the last meeting between them. And his memory ________ as he listened to the familiar song. ( ) A: unfolded B: unveiled C: unpacked D: revealed

Protein folding has been studied in the laboratory using highly purified proteins. A protein can be unfolded, or denatured, by treatment with _______ that disrupt the noncovalent interactions holding the folded chain together.

Questions 6 and 7 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. The shootings unfolded in the morning over 2 hours in ______. A: 1 location B: 2 separate locations C: 3 separate locations D: 4 separate locations