Select the true statements about protein secondary structure.
A. In a β‑pleated sheet, the side chains extend above and below the sheet.
B. The secondary level of protein structure refers to the spatial arrangements of short segments of the protein.
C. Disulfide bonds stabilize secondary structure. In an α‑helix, the side chains are located inside the helix.
D. The α‑helix is held together by hydrogen bonds between the amide N − H and C = O groups.

i think   the answer is c hope i'm right

answer: - first one is the correct answer. .

explanations: - potassium sulfide is and cobalt(ii) chloride is .

charge on k is +1, charge on s is -2, charge on co is +2 and charge on cl is -1.

in a double replacement reaction the ion exchange takes place. in general the reaction looks like:

if one of the product is insoluble as per solubility rules then a precipitate of it is formed.

when we mix the aqueous solutions of potassium sulfide and cobalt(ii) chloride then chloride ion goes with potassium ion and sulfide ion goes with cobalt ion and the balanced equation is written as:

k and cl has equal charges, similarly co and s has equal charges and hence no subscripts are used for the product side.

as per the solubility rules, cos is insoluble and so it's precipitate is formed.

looking at the given choices, first choice is correct.