4traits are controlled by dna through the
order of its -
a carbon bases.
b ribonucleic sugars.
c phosphate backbone.
d nitrogen bases.

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

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Why should organisms reproduce more offspring than will survive? select all that apply.