BCH Exam 1
Which of the following is the most abundant element in the human body?
A) nitrogen
B) carbon
C) oxygen
D) phosphorous ANS: C) Oxygen
Which of the major types of biomolecules is never found in a polymeric form?
A) Amino Acids
B) Carbohydrates
C) Nucleotides
D) Lipids ANS: D) Lipids
Which of the following biopolymers is correctly paired with the bong that forms between the
monomers?
A) Protein: amide bond
B) Polysaccharide: ether bond
C) DNA: phosphate bond
D) RNA: phosphate bond
E) all of the above ANS: A) protein: amide bond
Which of the biopolymers is correctly paired with its major function?
A) protein: information encoding
B) nucleic acids: energy storage
C) lipids: information envoding
D) polysaccharide: energy storage ANS: D) polysaccharide: energy storage
,Which of the following molecules contains the most oxidized form of carbon?
A) acetaldehyde
B) ethanol
C) acetic Acid
D) ethylene
E) carbon dioxide ANS: E) carbon dioxide
In a hydrogen bond between a water molecule and another biomolecule ____________.
A) the hydrogen bond will typical form between a hydrogen atom and a either a nitrogen, sulfur, or
oxygen atom
B)a hydrogen on the water molecule forms a covalent bond to an oxygen or nitrogen atom on the other
molecule
C) the hydrogen atom is located between an oxygen atom of the water and a carbon atom of the other
molecule ANS: A) the hydrogen will typically form between a hydrogen atom and either a nitrogen,
sulfur, or an oxygen atom
What term is used to describe the exclusion of non-polar substances from an aqueous solution?
A) non-polar effect
B) lipid effect
C) hydrophobic effect
D) oil droplet effect
E) amphiphilic effect ANS: C) hydrophobic effect
What is the buffer that is found in our bloodstream? ANS: H2CO3 ---> HCO3 +H
, During vigorous exercise, hydrogen ions are produced within cells as a result of increased metabolism.
What component of the intracellular buffer would increase as a result of the increased H+ product?
A) H3PO4
B) H2PO4
C) HPO4
D) PO4 ANS: B) H2PO4
When a peptide forms, a(n) ________ reacts with a carboxylate group.
A) amide
B) amine
C) alcohol
D) ester
E) none of the above ANS: B) amine
At a PH above its pKa, the phenolic group of tyrosine is _________.
A) protonated and neutral
B) protonated and positively charged
C) deprotonated and neutral
D) deprotonated and negatively charged
E) none of the above ANS: D) deportanated and negatively charged
What is the C-terminal amino acid in the pentapeptide Val-Leu-Arg-Ser-Gly ANS: C-terminal amino acid
is Gly
Which of the following amino acids has a thiol group in its side chain?
A) Ser
Which of the following is the most abundant element in the human body?
A) nitrogen
B) carbon
C) oxygen
D) phosphorous ANS: C) Oxygen
Which of the major types of biomolecules is never found in a polymeric form?
A) Amino Acids
B) Carbohydrates
C) Nucleotides
D) Lipids ANS: D) Lipids
Which of the following biopolymers is correctly paired with the bong that forms between the
monomers?
A) Protein: amide bond
B) Polysaccharide: ether bond
C) DNA: phosphate bond
D) RNA: phosphate bond
E) all of the above ANS: A) protein: amide bond
Which of the biopolymers is correctly paired with its major function?
A) protein: information encoding
B) nucleic acids: energy storage
C) lipids: information envoding
D) polysaccharide: energy storage ANS: D) polysaccharide: energy storage
,Which of the following molecules contains the most oxidized form of carbon?
A) acetaldehyde
B) ethanol
C) acetic Acid
D) ethylene
E) carbon dioxide ANS: E) carbon dioxide
In a hydrogen bond between a water molecule and another biomolecule ____________.
A) the hydrogen bond will typical form between a hydrogen atom and a either a nitrogen, sulfur, or
oxygen atom
B)a hydrogen on the water molecule forms a covalent bond to an oxygen or nitrogen atom on the other
molecule
C) the hydrogen atom is located between an oxygen atom of the water and a carbon atom of the other
molecule ANS: A) the hydrogen will typically form between a hydrogen atom and either a nitrogen,
sulfur, or an oxygen atom
What term is used to describe the exclusion of non-polar substances from an aqueous solution?
A) non-polar effect
B) lipid effect
C) hydrophobic effect
D) oil droplet effect
E) amphiphilic effect ANS: C) hydrophobic effect
What is the buffer that is found in our bloodstream? ANS: H2CO3 ---> HCO3 +H
, During vigorous exercise, hydrogen ions are produced within cells as a result of increased metabolism.
What component of the intracellular buffer would increase as a result of the increased H+ product?
A) H3PO4
B) H2PO4
C) HPO4
D) PO4 ANS: B) H2PO4
When a peptide forms, a(n) ________ reacts with a carboxylate group.
A) amide
B) amine
C) alcohol
D) ester
E) none of the above ANS: B) amine
At a PH above its pKa, the phenolic group of tyrosine is _________.
A) protonated and neutral
B) protonated and positively charged
C) deprotonated and neutral
D) deprotonated and negatively charged
E) none of the above ANS: D) deportanated and negatively charged
What is the C-terminal amino acid in the pentapeptide Val-Leu-Arg-Ser-Gly ANS: C-terminal amino acid
is Gly
Which of the following amino acids has a thiol group in its side chain?
A) Ser
