Based on the diagram of field lines below, decide which statement best describes the charge on A and on B. O A is negative, B is positive
A is positive, B is positive
A is negative, B is negative
х
A is positive, B is negative

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.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Why is the melting of ice a physical change ?