Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
What is the systematic name of the amino acid drawn above?
2-aminoethanoic acid
2-aminopentanoic acid
2-aminopropanoic acid
2-aminobutanoic acid
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Which of the following functional groups are present in amino acids?
(Select all that apply),
carbonyl group
ester group
carboxyl group
amine group
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What is a zwitterion?
a molecule containing only positive charges
a molecule containing both positive and negative charges
a molecule containing only negative charges
a molecule with an overall charge
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When do amino acids form zwitterions?
when the pH is much lower than their isoelectric point
when the pH is much higher than their isoelectric point
when the pH is close to their isoelectric point
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What happens to the amine group in a zwitterion?
it remains neutral as NH2
it loses a proton to become positively charged NH2+
it gains a proton to become positively charged NH3+
it loses a proton to become negatively charged NH2-
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What happens to the carboxyl group in a zwitterion?
it loses a proton to become negatively charged COO-
it loses a proton to become positively charged COO+
it gains a proton to become positively charged COOH+
it gains a proton to remain neutral as COOH
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What determines the exact isoelectric point where the zwitterion forms for different amino acids?
the amino acid's R-group
the temperature of the amino acid solution
the number of carbons in the amino acid
the concentration of the amino acid solution
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In the general structure of an α-amino acid, what does the 'R' represent?
the carboxylic acid group
the side chain
the amine group
the α-carbon
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What is the term for molecules that can act as both acids and bases?
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