Question

How are the R groups oriented in a beta strand?

Answer 1

Answer: alternate sides of the sheet.

Step-by-step explanation:

Amino Acid R groups in the alpha helix radiate outwards from the helix. Hydrogen bonds between the NH and C=0 are nearly parallel with the helical axis. The R groups in beta sheets alternate sides of the sheet. The hydrogen bonds in beta sheets are nearly perpendicular to the chains.

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Answer 2

In a beta strand, the R groups are oriented above and below the folds of the pleat and contribute to the stability and structure of the strand.

Step-by-step explanation:

In a beta strand, the R groups are oriented above and below the folds of the pleat. The pleated segments can align either parallel or antiparallel to each other. Hydrogen bonds form between the partially positive nitrogen atom in the amino group and the partially negative oxygen atom in the carbonyl group of the peptide backbone. This arrangement of R groups and hydrogen bonding contributes to the stability and structure of the beta strand.