객관식
Which of the following primarily dictates the three-dimensional structure of a protein molecule synthesized by the body?
125
views
3. Amino Acids
Amino Acid Configuration
객관식
Which of the following functional groups of an amino acid would be in the ionized (deprotonated) state at high pH?
A
Amino group (\(-NH_2\))
B
Side chain of glycine
C
Hydrogen atom attached to the alpha carbon
D
Carboxyl group (\(-COO^-\))
검증된 단계별 안내1
Understand the concept of pH and its effect on ionization: At high pH (basic conditions), the environment has a low concentration of hydrogen ions (\(\text{H}\)^+), which promotes deprotonation of acidic functional groups.
Identify the functional groups in an amino acid: Amino acids typically have an amino group (\(\text{-NH}\)_2), a carboxyl group (\(\text{-COOH}\)), a hydrogen atom attached to the alpha carbon, and a side chain (R group).
Determine the behavior of the carboxyl group (\(\text{-COOH}\)) at high pH: The carboxyl group is acidic and tends to lose a proton (\(\text{H}\)^+) under basic conditions, becoming ionized as \(\text{-COO}\)^-.
Analyze the amino group (\(\text{-NH}\)_2): The amino group is basic and tends to accept a proton (\(\text{H}\)^+) under acidic conditions, but at high pH, it remains in its neutral state (\(\text{-NH}\)_2) and does not ionize further.
Conclude that the carboxyl group (\(\text{-COO}\)^-) is the functional group that would be in the ionized (deprotonated) state at high pH, as it loses a proton and becomes negatively charged.
관련 영상
관련 실천
