Please help some of these were marked wrong and I do not kno

Please help, some of these were marked wrong and I do not know which ones.

phenylalanine and alanine differ by only a single carbon methionine and cysteine have sulfur in their sidechains The sidechain of arginine contains 3 nitrogens If one were to take valine\'s sidechain and add a CH3 to one end, you\'d have isoleucine The sidechain of leucine contains four carbons The sidechain of glycine has 3 carbons

Solution

1. TRUE.

Alanine has a -CH3 for the R group and Phenylalanine has a -CH2 ph group.

2. TRUE.

3. FALSE.

Side-chain of arginine consists of a 3-Carbon aliphatic straight chain.

4. TRUE.

5.TRUE.

6.FALSE