Question 5. (a) using the table of aa propensities from the book, rate each of the three peptides below for its likelihood to be found in either an a-helix or a b-sheet, by adding up the values for each amino acid in either conformation. note that they are all the same length, so this comparison is reasonable. do not draw these peptides! (b) now, check each peptide for "sequence busters" - amino acids and groups of amino acids that are hardly ever found in either helices or in sheets (c) pick the one sequence most likely to be in a helix and the one most likely to be in a sheet and justify your choice based on your work above in (a) and (b). describe why the third sequence doesn't have a preference for a helix or sheet. (a) a-r-d-q-e-h-l-k-m-s-a-q-k (b) l-r-n-c-q-i-l-f-t-w-y-v-i (c) q-a-n-e-g-h-l-k-m-p-y-e-m

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. for example, if you are asked to add 14.3 g of copper, add between 13 g and 15 g. which of the following sets include two samples with an equal density? which all that apply below 15.4 g gold and 18.7 g silver 15.2 g copper and 50.0 g copper 20.2 g silver and 20.2 g copper 11.2 g gold and 14.9 g gold

Liv sheldon given the balanced equation for an organic reaction: c2h2 + 2cl2 → c2h2cl4 this reaction is best classified as *

Nconcentration refers to the molar concentration of an ion in solution. it may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution. for soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. for example, 1 m of alcl3 is 1 m in al3+ and 3 m in cl−. 1 m of (nh4)2so4 is 2 m in nh4+ and 1 m in so42−. part a what is the concentration of k+ in 0.15 m of k2s? view available hint(s) nothing m m part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 550 ml of a solution that has a concentration of na+ ions of 0.700 m ? express your answer numerically in grams. view available hint(s) mass of na3po4 n a 3 p o 4 = nothing g provide feedback