What two measures describe the distribution of a trait in a sample?
What will be an ideal response?
variance and standard deviation
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Referring to Figure 10.17 if necessary, identify which type of cell-cell interaction is most likely to force the products of digestion to be absorbed across microvilli of intestinal cells rather than allowing them to leak between cells
A. gap junctions B. tight junctions C. plasmodesmata D. hemidesmosomes E. desmosomes
Which one of the following happens during repolarization of a neuron?
A) Sodium channels close, and potassium rushes out of the cell to temporarily reestablish the membrane potential. B) Potassium channels close, preventing further loss of positive ions. C) The sodium-potassium pump is turned off. D) Sodium channels open to allow sodium ions to rush back out of the cell. E) The membrane potential is eliminated.
Jonas Salk developed a(n) (attenuated/inactivated/subunit) polio vaccine in 1955
What will be an ideal response?
During S phase, chromosomes are converted to what form?
A) chromatin B) karyotypes C) centrosomes D) sister chromatids