Question

when analyzing r - group structure, another factor to consider is the size and bulkiness of the r - group. compare the two amino acids shown below. which statements accurately compare their r - groups? select all that apply.
the r - group on the right is bulkier than the r - group on the left.
the r - group on the right has nitrogen atoms while the r - group on the left has carbon and hydrogen atoms.
the r - group on the right has partial charges while the r - group on the left has no charges.
the r - group on the right is larger than the r - group on the left.

Explanation:

The left - hand amino acid has an R - group of $-CH_3$ (methyl), which is small. The right - hand amino acid has an R - group with a phenyl ring attached to the methyl group ($-CH_2 - C_6H_5$), making it bulkier and larger. There are no nitrogen atoms in either R - group, and neither R - group has partial charges.

Answer:

The R - group on the right is bulkier than the R - group on the left.
The R - group on the right is larger than the R - group on the left.