Which best describes mitochondrial dna (mtdna)? a. mitochondrial dna is the same as nuclear dna. b. mitochondrial dna is inherited through the father. c. mitochondrial dna can be traced for generations. d. mitochondrial dna requires large amounts for testing.

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

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

What is the difference between a scientific hypotheses and a scientific theory?