*Question*
Q: With an increased understanding of gene regulation and gene function, medicines can be designed to specifically target diseased cells without harming these? Choices: - hosts - stem cells - pathogens - healthy cells A:
**Answer**
healthy cells

*Question*
Q: Scientists often classify or organize different objects based on their what? Choices: - experimental properties - behavioral traits - independent variables - physical properties A:
**Answer**
physical properties

*Question*
Q: The lighter photic zone and darker aphotic zone are determined by what? Choices: - water reflection - water shape - water density - water depth A:
**Answer**
water depth

*Question*
Q: What is the name of the process that changes some chemical substances into others? Choices: - acid reaction - mixture - hypodermic reaction - chemical reaction A:
**Answer**
chemical reaction