1. which of the following statements about proteins is incorrect?

(a) all proteins are made up of some combination of 20 essential amino acids.
(b) like nucleic acids, polypeptides have polarity.
(c) a single polypeptide has primary, secondary and tertiary structures.
(d) α-helix and β-pleated sheets do not require specific sequence of amino acids to form.
(e) some proteins contain more than one polypeptide chain.

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective