Match the following.
organelle
metabolism
1. the basic unit of life
a giant molecule consisting of the sugar deoxyribose,
2. phosphates, and nitrogen bases; contains the coded genetic
information
the maintenance of a constant internal body environment by
an organism's body
all of the chemical reactions in the organism for maintenance
of the processes of life
a small structure within the cell that serves specialized
functions
DNA
homeostasis
cell
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Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

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

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis