Which of the following is a true statement about chloroplasts? . a) they transport glucose into the cell. b) they convert light energy into chemical energy. c) they are present in animal cells, but not in plant cells. d) they convert the energy in glucose into a more usable form.

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

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Which of the following best describes the relationship between glucose and complex molecules such as hormones?