The substance on which the enzyme acts is called the
a. enzyme
b. substrate
c. catalyst
d. buffer

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

4. how does a phospholipid behave in water? the phosphate head does not mix with water; the fatty acid tails do. the phosphate head and the fatty acid tails mix with water. the phosphate head and the fatty acid tails do not mix with water. the phosphate head mixes with water; the fatty acid tails do not.

What is the most abundant vertebrate on earth?