Question 32

Summary: (a) Definition of half-life of an isotope; one use of radioisotopes in biochemistry; evidence that increased understanding of photosynthesis. (b) Investigation, including control of variables, to test observations by a listed 17th and 18th century scientist. (c) Graph of data; prediction based on data; reason for action spectrum of photosynthesis not matching that of chlorophyll. (d) Explanation of the role of research in confirming the relationship between ATP production and photosynthesis.