- Which amino acid does not contain a chiral carbon?

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NEED HELP ON THESE THREE PHYSICS PROBLEMS. PLEASE THIS IS LITERALLY MY GRADE. IF SOMEONE IS SMART ENOUGH TO DO THESE, I OWE YOU. THANKS? Probability Questions? What is the frequency of VHF that can be transmitted by astronauts around the Earth? ... fm or am or ssb mode? Find the Taylor Series of {z}/{1+z^2} about z=0. Find the region of validity of this Taylor Series.? How do i factor 12x^(3)-24x^(2)+12x+24? I tried grouping but I couldn't find the answer... is it factorable?