Which of these substances acts as a buffer?

blood
lemon juice
curd

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.