SAT Subject Biology Practice Question 327: Answer and Explanation
17. A volunteer was injected intravenously with several test substances to determine the effect of each substance on normal body variables. The results are shown in Table 1. Assume that enough time was allowed between injections so that the substances do not interfere with one another.
All of the following changes in variable values are significant EXCEPT
A. the change in serum glucose when substance A is injected
B. the change in serum Na+ when substance D is injected
C. the change in serum Ca++ when substance B is injected
D. the change in serum glucose when substance C is injected
E. the change in serum Na+ when substance B is injected
Correct Answer: E
E The change in serum sodium after injection of Substance B is insignificant. All other choices cause significant change from the baseline values of the variables being measured. Don't forget the LEAST/EXCEPT/NOT technique.