Which of the following statements about the oxyanion hole in serine proteases are true? This preformed loop is properly positioned to stabilize the negatively charged tetrahedral intermediate involved in amide bond hydrolysis. The backbone NH bonds of S195 and G193 create H-bonding interactions with the developing negative charge as S195 attacks the scissile carbon bond. It represents an enthalpic interaction that helps stabilize the transition state. It represents an electrostatic interaction that leads to a lower energy

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6