Question 1: Which of the following is not a characteristic of enzymes?
A) they are proteins
B) they speed up the rate of chemical reactions
C) they act on specific substances called substrates
D) they are used up in each reaction, thus need to be produced in large quantities
Question 2: Which of these does not have to be present for photosynthesis to occur?
A) water
B) carbon dioxide
C) glucose
D) chlorophyll
Give reasoning with your answer.