Select the true statements about secondary structure
a) in a β-pleated sheet, the side chains extend above and below the sheet
b) in an α-helix, the side chains are located inside the helix
c) the α-helix is held together by hydrogen bonds between the amide n-h and c=o groups
d) the secondary level of protein structure refers to the spatial arrangements of short segments of the protein
e) peptide bonds stabilize secondary structure

The statemens correct are: A) In a β-pleated sheet, the side chains extend above and below the sheet,

C) The α-helix is held together by hydrogen bonds between the amide N-H and C=O groups

D) The secondary level of protein structure refers to the spatial arrangements of short segments of the protein

E) Peptide bonds stabilize secondary structure

Explanation: The statement B is incorrect, because the amino acid side chains extend outside the alpha-helix, not inside

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

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