1- At physiological pH, all amino acids
gain a proton at the amino group
loose a proton at the amino group 
are cations
are anions

2- 
The amino acid above is:
proline
tryptophan
histidine
asparagine

3- Amino acid oxidated in collagen
glycine
valine
proline
tyrosine

4- Highly hydrophobic amino acid
lysine
glycine
methionine
alanine

5- Highly hydrophilic amino acid
aspartate
leucine
cysteine
threonine

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Answers:

1- At physiological pH, all amino acids
Answer: gain a proton at the amino group

2- 
The amino acid above is:
Answer: proline

3- Amino acid oxidated in collagen
Answer: proline

4- Highly hydrophobic amino acid
Answer: methionine

5- Highly hydrophilic amino acid
Answer: aspartate