V lít dung dịch HCl có pH=3 a) Cần bớt thể tích nước bằng bao nhiêu v để thu được dung dịch có pH=2
b) Cần thêm thể tích nước bằng bao nhiêu v để thu được dung dịch có pH=4

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.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Mr. rose asked his student to draw a quadrilateral with four unequal sides. an example of this kind of quadrilateral