They can tell us the age of the fossils!
Cellular junctions: by connecting cells to their neighbors
Receptors: allowing cells to respond to chemical messages
Answer:
pH of 6.5
Explanation:
The pH favorable to an enzyme where it is most active is called optimum pH. The optimum pH of sucrase is about 6.0 while that of catalase is 7.0. Both enzymes can however still show some activity when the solution is slightly basic or slightly acidic (from it's optimum pH). Hence, getting the middle point (6+7/2 = 6.5) between the optimum pH of the two enzymes and preparing same will ensure the enzymes show some activity.
I’m pretty sure the answer is the third choice