▁time ▁very ▁different ▁bio chem ical ▁activities . ▁This ▁is ▁because ▁they ▁exhib it ▁a ▁handed ness ▁that ▁is ▁commonly ▁found ▁in ▁living ▁systems . ▁One ▁manifest ation ▁of ▁this ▁ch ir ality ▁or ▁handed ness ▁is ▁that ▁they ▁have ▁the ▁ability ▁to ▁rotate ▁polar ized ▁light ▁in ▁different ▁directions . ▁ ▁Prote in ▁fol ding ▁concerns ▁the ▁complex ▁geomet ries ▁and ▁different ▁is om ers ▁that ▁prote ins ▁can ▁take . ▁ ▁Types ▁of ▁mole cular ▁structure ▁A ▁bond ▁angle ▁is ▁the ▁geometric ▁angle ▁between ▁two ▁adjacent ▁b onds . ▁Some ▁common ▁shapes ▁of ▁simple ▁mole cules ▁include : ▁ ▁Linear : ▁In ▁a ▁linear ▁model , ▁atoms ▁are ▁connected ▁in ▁a ▁straight ▁line . ▁The ▁bond ▁angles ▁are ▁set ▁at ▁ 1 8 0 ° . ▁For ▁example , ▁carbon ▁dio x ide ▁and ▁nit ric ▁ox ide ▁have ▁a ▁linear ▁mole cular ▁shape . ▁ ▁Tr ig onal ▁plan ar : ▁M ole cules ▁with ▁the ▁trig onal ▁plan ar ▁shape ▁are ▁somewhat ▁tri angular ▁and ▁in ▁one ▁plane ▁( flat ). ▁ ▁Con sequently , ▁the ▁bond ▁angles ▁are ▁set ▁at ▁ 1 2 0 ° . ▁For ▁example , ▁bor on ▁trif lu or ide . ▁ ▁Angular : ▁Angular ▁mole cules ▁( also ▁called ▁bent ▁or ▁V - sh aped ) ▁have ▁a ▁non - linear ▁shape . ▁For ▁example , ▁water ▁( H 2 O ), ▁which ▁has ▁an ▁angle ▁of ▁about ▁ 1 0 5 ° . ▁A ▁water ▁mole c ule ▁has ▁two ▁pairs