This is 11th grade chemistry semester study guide i need to answer them

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

How are isotopes of the same chemical element alike? how are they different?

Aman applies a force of 500n to push a truck 100m down the street how much does he do?