Question

which of the following statements is not true about r groups in β -pleated sheet?
a. the r groups of the peptide chain point outside.
b. the r groups are attached to the carbons and extend above and below the folds of the pleat.
c. the amino acids tend to have smaller r groups.
select the correct answer below:
o a and b
o a and c
o b and c
o only a

Explanation:

In a β - pleated sheet, the R groups are attached to the carbons and extend above and below the folds of the pleat (so statement b is true). The amino acids in β - pleated sheets tend to have smaller R groups (so statement c is true). However, the R groups of the peptide chain do not just point outside in a simple sense as described in statement a. The correct orientation is related to being above and below the pleat structure.

Answer:

only a