Amino acids question

Practice Question Solving
1

hi

why is methionine non polar while cysteine is polar?
S has about the same electronegativity and C
and C has about the same electronegativity as H

Methionine residual group = CH2CH2SCH3
Cysteine residual group = CH2SH

2

https://www.quora.com/Why-is-cistine-polar-while-methionine-is-non-polar#:~:text=Methionine%20has%20alkyl%20groups%20either,H%20bond%20is%20still%20polar. :smiley:

3

thank you for your answer, but i am still confused, if CH2SCH3 is analogous to an ether, and ether is still polar (bent structure and not linear because of single bonds), what makes the S non polar?