24.   Which curves on the graphs in Figure 6.3 may represen…

24.   Which curves on the graphs in Figure 6.3 may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline (basic) hot spring at temperatures of 70°C or higher?  A) curves 1 and 5 B) curves 2 and 4 C) curves 2 and 5 D) curves 3 and 4 E) curves 3 and 5

5. Which of the following is true concerning cancer cells? …

5. Which of the following is true concerning cancer cells?  A) They exhibit density-dependent inhibition when growing in culture.  B) They must be attached to a substrate to divide in culture.  C) They evade the normal controls that trigger programmed cell death.  D) They stop dividing in culture when growth factors are depleted.