Practice Quiz (you will need your amino acid sheet for this quiz)

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Presentation transcript:

Practice Quiz (you will need your amino acid sheet for this quiz) Amino acids & peptides Practice Quiz (you will need your amino acid sheet for this quiz)

Question 1 Approximately what mass percent of a body’s dry weight consists of proteins? 5% 25% 50% 72% Answer: C) sorry, did I forget to mention that in class?

Question 2 Which functional group, in addition to an amine, do all amino acids contain? an alcohol an amide a carboxylic acid an oxyacid Answer: C)

Question 3 A peptide bond links an alcohol and a ketone an amide and an aldehyde an amine and a carboxylic acid an amide and a carboxylic acid Answer: C)

Question 4 What does the term ‘α-amino acid mean? The amino acid attaches to the carbon in the carboxyl group The amino group attaches to the carbon next to the carboxylic acid group The amino acid contains only one carbon atom The amino acid contains only one carboxylic acid group Answer: b)

Question 5 When referring to amino acids, what does the term essential mean? These are acids which are necessary for digestion are necessary for respiration are synthesized in our bodies we must obtain from our diet Answer: d)

Question 6 Which of the following amino acids is not basic? arginine glycine histidine lysine Answer: b)

Question 7 Which of the following amino acids is acidic? alanine aspartic glycine valine Answer: b)

Question 8 Which one of the following amino acids contains a double ring structure? phenylalanine proline tryptophan tyrosine Answer: C)

Question 9 Which one of the following amino acids contains a benzyl group? glycine isoleucine methionine phenylalanine Answer: d)

Question 10 What does the term hydrophobic mean? water reactive water repelling water soluble water proof Answer: b)

Question 11 Which of the following amino acids is hydrophobic? leucine serine threonine tyrosine Answer: a)

Question 12 All but one of the common amino acids contain a –NH2 amino group. Which one contains an –NH- amino acid as part of a ring structure? phenylalanine proline tryptophan tyrosine Answer: b)

Question 13 In how many different ways can the amino acids: ALA, CYS, MET, GLU, SER and TYR connect together to form a polypeptide? Over 5000 720 120 21 Answer: b) 6! = 720

Question 14 The diagram is an example of: An L-amino acid A D-amino acid An achiral-amino acid An amino acid residue Answer: a)

Question 15 What kind of bonding stabilises helical and β-pleated-sheet secondary protein structure? Vander Waals forces Hydrogen bonding Interactions with neighbouring protein chains Helical and sheet structures are tertiary, not secondary structures Answer: b)

Who’s your favourite Chemistry teacher? A Kevin A nother A non None of the above Answer: a) A Kevin (of course)