Sodium (Na) and Potassium (K) are elements that are constantly being moved in and out of cells to maintain
homeostasis (healthy and stable cell condition). When
the Na+ and K+ ions are out of balance, bad things
happen like heart attacks, muscles and nerve impulses
do not work properly, and the proper functions of cells
could deteriorate or cease entirely.
What protein is used to shuffle Na+ and K+ in and out of
cells through the cell membrane?

Where does the information about where each transcription factor binds originate?

Nucleic acids offer variability because they contain alternate forms of genes called .

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.