## DESCRIPTION ## Select the amino acid that corresponds to the given description. ## ENDDESCRIPTION ## KEYWORDS('amino acids','descriptions','which one','multiple choice') ## DBsubject('Biochemistry') ## DBchapter('') ## DBsection('') ## Date('2026-07-12') ## Author('Neil R. Voss') ## Institution('Roosevelt University') DOCUMENT(); loadMacros( 'PGstandard.pl', 'PGML.pl', 'PGchoicemacros.pl', 'parserRadioButtons.pl', 'PGcourse.pl', ); TEXT(beginproblem()); $showPartialCorrectAnswers = 0; #========================================================== # QUESTION DATA #========================================================== # All questions data @questions_data = ( { 'item_name' => 'a non-polar amino acid, with a single methyl group (-CH₃) as its side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'glutamate', 'glycine', 'serine', 'valine', ], 'correct' => 'alanine', }, { 'item_name' => 'a non-polar amino acid, with only a methyl group (-CH₃) attached to the α-carbon', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'asparagine', 'histidine', 'tryptophan', 'tyrosine', ], 'correct' => 'alanine', }, { 'item_name' => ' H ^–OOC C_α CH₃ NH₃⁺ ', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'glutamine', 'isoleucine', 'phenylalanine', 'tyrosine', ], 'correct' => 'alanine', }, { 'item_name' => 'a positively charged amino acid with a long, flexible side chain containing 3 nitrogen atoms (guanidinium)', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'arginine', 'asparagine', 'aspartic acid', 'glutamine', 'leucine', ], 'correct' => 'arginine', }, { 'item_name' => 'a polar amino acid with a shorter amine-substituted carboxylate (amide) -C(=O)NH₂ group', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'cysteine', 'glutamic acid', 'glycine', 'leucine', ], 'correct' => 'asparagine', }, { 'item_name' => 'a negatively charged amino acid with a small, carboxylate (-COOH) side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'aspartate', 'glycine', 'lysine', 'valine', ], 'correct' => 'aspartate', }, { 'item_name' => 'a negatively charged amino acid with a small, carboxylate (-COOH) side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'arginine', 'aspartic acid', 'leucine', 'threonine', 'valine', ], 'correct' => 'aspartic acid', }, { 'item_name' => 'a polar amino acid with a thiol (-SH) group that can form disulfide bonds', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'cysteine', 'glycine', 'methionine', 'tryptophan', ], 'correct' => 'cysteine', }, { 'item_name' => 'a polar amino acid that can form disulfide bridges', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'cysteine', 'glutamine', 'glycine', 'lysine', 'tyrosine', ], 'correct' => 'cysteine', }, { 'item_name' => 'a polar amino acid that is capable of thiol (-SH) chemistry', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'arginine', 'cysteine', 'proline', 'tyrosine', ], 'correct' => 'cysteine', }, { 'item_name' => ' O=C–OH H C_α CH₂ SH H–N–H ', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'asparagine', 'aspartate', 'cysteine', 'isoleucine', ], 'correct' => 'cysteine', }, { 'item_name' => 'a polar amino acid with a longer amine-substituted carboxylate (amide) -C(=O)NH₂ group', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'glutamine', 'leucine', 'proline', 'tryptophan', 'tyrosine', ], 'correct' => 'glutamine', }, { 'item_name' => 'a negatively charged amino acid with a large, carboxylate (-COOH) side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'aspartic acid', 'glutamate', 'lysine', 'threonine', 'valine', ], 'correct' => 'glutamate', }, { 'item_name' => 'a negatively charged amino acid with a large, carboxylate (-COOH) side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'arginine', 'glutamic acid', 'leucine', 'serine', 'valine', ], 'correct' => 'glutamic acid', }, { 'item_name' => 'a small amino acid with a single hydrogen atom as its side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'aspartate', 'cysteine', 'glycine', 'methionine', ], 'correct' => 'glycine', }, { 'item_name' => 'a small amino acid with the simple chemical formula NH₂-CH₂-COOH', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'arginine', 'cysteine', 'glutamic acid', 'glycine', 'valine', ], 'correct' => 'glycine', }, { 'item_name' => ' H ^–OOC C_α H NH₃⁺ ', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'cysteine', 'glutamic acid', 'glycine', 'histidine', 'proline', ], 'correct' => 'glycine', }, { 'item_name' => 'an aromatic amino acid with a side chain containing a 5-membered nitrogenous ring and a pKa close to pH 7', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'glutamate', 'histidine', 'phenylalanine', 'proline', 'serine', ], 'correct' => 'histidine', }, { 'item_name' => 'a non-polar branched chain amino acid that is an isomer of leucine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'aspartic acid', 'histidine', 'isoleucine', 'phenylalanine', 'serine', ], 'correct' => 'isoleucine', }, { 'item_name' => 'a non-polar branched chain amino acid that is a valine with a extra methyl group (-CH₃) at the end', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'cysteine', 'isoleucine', 'methionine', 'proline', 'tyrosine', ], 'correct' => 'isoleucine', }, { 'item_name' => 'a non-polar branched chain amino acid that is an isomer of isoleucine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'glutamine', 'leucine', 'lysine', 'methionine', 'valine', ], 'correct' => 'leucine', }, { 'item_name' => 'a non-polar branched chain amino acid with a double methylated γ-carbon', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'aspartate', 'histidine', 'leucine', 'threonine', ], 'correct' => 'leucine', }, { 'item_name' => 'a non-polar branched chain amino acid that is a longer version of valine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'aspartic acid', 'glutamine', 'glycine', 'leucine', ], 'correct' => 'leucine', }, { 'item_name' => 'a positively charged amino acid with a long, flexible side chain containing an amine group', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'isoleucine', 'lysine', 'methionine', 'phenylalanine', 'tryptophan', ], 'correct' => 'lysine', }, { 'item_name' => 'a non-polar amino acid with a side chain containing a sulfur atom that is NOT available for chemical reactions', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'glycine', 'lysine', 'methionine', 'proline', 'tyrosine', ], 'correct' => 'methionine', }, { 'item_name' => 'a non-polar amino acid with an aromatic side chain containing a single benzene (-C₆H₆) ring', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'glutamine', 'glutamic acid', 'lysine', 'methionine', 'phenylalanine', ], 'correct' => 'phenylalanine', }, { 'item_name' => 'a non-polar amino acid where the side chain is bonded to the backbone amine, resulting in a rigid cyclic structure', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'aspartic acid', 'glutamate', 'glycine', 'methionine', 'proline', ], 'correct' => 'proline', }, { 'item_name' => 'a polar amino acid with the smallest side chain containing a hydroxyl group (-OH)', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'glycine', 'serine', 'tyrosine', 'valine', ], 'correct' => 'serine', }, { 'item_name' => 'a polar amino acid with the smallest polar side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'alanine', 'histidine', 'methionine', 'serine', 'threonine', ], 'correct' => 'serine', }, { 'item_name' => ' O=C–OH H C_α CH₂ OH H–N–H ', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'arginine', 'histidine', 'leucine', 'phenylalanine', 'serine', ], 'correct' => 'serine', }, { 'item_name' => 'a polar amino acid that is a methylated form of serine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'aspartic acid', 'glutamate', 'lysine', 'threonine', 'valine', ], 'correct' => 'threonine', }, { 'item_name' => 'an aromatic amino acid with the largest side chain consisting of a fused pair of rings', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'cysteine', 'glycine', 'lysine', 'proline', 'tryptophan', ], 'correct' => 'tryptophan', }, { 'item_name' => 'a aromatic amino acid with a side chain containing a phenol (-C₆H₆OH) group, derived from phenylalanine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'aspartic acid', 'glycine', 'methionine', 'tyrosine', ], 'correct' => 'tyrosine', }, { 'item_name' => 'a non-polar branched chain amino acid with the shortest hydrophobic side chain', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'glutamic acid', 'leucine', 'threonine', 'valine', ], 'correct' => 'valine', }, { 'item_name' => 'a non-polar branched chain amino acid that is a shorter version of leucine', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'asparagine', 'glutamic acid', 'histidine', 'methionine', 'valine', ], 'correct' => 'valine', }, { 'item_name' => 'a non-polar branched chain amino acid with a double methylated β-carbon', 'plural_choice' => 'amino acids', 'singular_item' => 'description', 'choices' => [ 'aspartate', 'isoleucine', 'tryptophan', 'tyrosine', 'valine', ], 'correct' => 'valine', }, ); #========================================================== # SELECT RANDOM QUESTION #========================================================== my $local_random = PGrandom->new(); $local_random->srand($problemSeed); $question_idx = $local_random->random(0, scalar(@questions_data) - 1, 1); $q = $questions_data[$question_idx]; $item_name = $q->{'item_name'}; $plural_choice = $q->{'plural_choice'}; $singular_item = $q->{'singular_item'}; @choices = @{ $q->{'choices'} }; $correct = $q->{'correct'}; #========================================================== # SHUFFLE CHOICES (SEED-STABLE) #========================================================== my @choice_indices = (0 .. $#choices); my @choice_shuffled = (); while (@choice_indices) { my $pick = $local_random->random(0, $#choice_indices, 1); push @choice_shuffled, splice(@choice_indices, $pick, 1); } @choices = @choices[@choice_shuffled]; #========================================================== # BUILD RADIO BUTTONS #========================================================== $rb = RadioButtons( [@choices], $correct, labels => 'ABC', displayLabels => 1, randomize => 0, separator => '

', ); #========================================================== # PGML #========================================================== BEGIN_PGML Which one of the following [$plural_choice]* corresponds to the [$singular_item]* [$item_name]*? [_]{$rb} END_PGML BEGIN_PGML_SOLUTION The correct answer is: [$correct]* END_PGML_SOLUTION ENDDOCUMENT();