Red blood cells have a protein that carries oxygen. Sickle cell anemia is a genetic disease that causes red blood cells to have an odd shape. The odd shape prevents the blood cells from carrying as much oxygen as they should. What is the most likely cause for this disease? 1) expression of additional RNA during transcription.
2) excessive cell division during mitosis.
3) failure to produce enough plasma to contain the oxygen.
4) a change in the proteins that express the normal trait.

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

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

One gene can influence trait(s). one trait can be determined by gene(s).