(c) Identify the plasmid that must contain the CD3y core promoter sequence but the fewest or no negative regulatory sequences. Based on the data in Figure 2, describe the most likely
cause of the variation in luciferase activity among the cells that contain plasmids pCD37-419. pCD37-309, pCD37-239, and pCD37-199. Calculate the approximate percent increase
in luciferase activity between cells containing plasmid pCD37-59 and cells containing plasmid pCD37-149. Round to the nearest whole number.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Do plant cells perform cellular respiration?