Vacuoles are essential in plants because the plants need a place to store water, and be able to keep their upright shape. In animals, we have muscles and bones to keep us upright, and plants have vacuoles. Hope this helps!
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Electrophoresis enables you to distinguish DNA fragments of different lengths. DNA is negatively charged, therefore, when an electric current is applied to the gel, DNA will migrate towards the positively charged electrode.
1. The elements are arranged by energy levels, valence electrons, what group its on (Alkali Metals, Alakine Earth Metals, Boron Family, etc.), and forms ( metals, nonmetals, metalliods).
2. The periodic table tells scientists how reactive an element is, if it is a metal, nonmetal, or metalliod, and what group it's in.
3. Every element in a group has the same number of valance electrons ( They all have the same reactivity).
4. Where is the chart? I can't view it if it is there.