Biochemistry Exam 1 Multiple Choice +
Formulas
Approximately what percentage of the human genome encodes for protein? -
answers3%
What pairs of atoms in bases are involved in hydrogen bonds?
A) N-H and O-H
B) N-H and S-H
C) O-H and P-O
D) All of the above
E) None of the above - answersA) N-H and O-H
The structure of DNA described by Watson and Crick included
A) a double helix
B) the sugar phosphate backbone aligned in the center of the helix
C) the base pairs that are stacked on the inside of the double helix
D) A and B
E) A and C - answersE) A and C
What two properties of water are important for biological interactions? - answersThe
polarity of water
The cohesive properties of water
How many hydrogen bonds are formed between A and T? - answers2
What gives proteins a dominant role in biochemistry? - answersTheir ability to
spontaneously fold into complex three-dimensional structures
Which of the following is considered a noncovalent bond?
A) Electrostatic interactions
B) Hydrogen bonds
C) Van der Waals interactions
D) All of the above
E) None of the above - answersD) All of the above
The First Law of Thermodynamics states what? - answersThe total energy of a system
and its surroundings is constant
The Second Law of Thermodynamics states what? - answersThe total entropy of a
system and its surroundings always increases for a spontaneous process
, List atoms commonly found in biological molecules that are often hydrogen-bond
acceptors. - answersOxygen
Nitrogen
What is the [A-]/[HA] ratio when the weak acid is in a solution one pH unit below its
pKa? - answers1:10
If a particular reaction has a negative delta-G (Gibbs Free Energy), is it likely to occur? -
answersYes, it is spontaneous
What is the [H+] concentration in a urine sample that has a pH of 8? - answers10^-8 M
What happens to nonpolar molecules in water? - answersThey aggregate together
What type of chiral amino acids is found in proteins? - answersL
What is another name for dipolar molecules? - answersZwitterions
When a peptide bond is formed, what molecule is also made? - answersWater
Write the name, three letter code, and single letter code for the amino acid for the
following:
A) the amino acid with a pKa near neutral pH
B) disulfide bonds are formed by pairs of which amino acid
C) this amino acid residue disrupts the alpha-helix because its side chain contains a
unique ring structure that restricts bond rotation - answersA) Histidine, His, H
B) Cysteine, Cys, C
C) Proline, Pro, P
What determines a protein's function? - answersStructure
What is the name of the plot that allows one to investigate the likely orientation of
certain amino acid pairs? - answersRamachandran
What type of structure includes alpha-helices, beta-sheets, and turns? -
answersSecondary structure
What type of protein structure develops when two proteins combine to form one larger
protein? - answersQuaternary structure
What is responsible for the tertiary structure of proteins? - answersInteractions between
amino acid side chains
Which of these agents can denature proteins?
A) Salt
Formulas
Approximately what percentage of the human genome encodes for protein? -
answers3%
What pairs of atoms in bases are involved in hydrogen bonds?
A) N-H and O-H
B) N-H and S-H
C) O-H and P-O
D) All of the above
E) None of the above - answersA) N-H and O-H
The structure of DNA described by Watson and Crick included
A) a double helix
B) the sugar phosphate backbone aligned in the center of the helix
C) the base pairs that are stacked on the inside of the double helix
D) A and B
E) A and C - answersE) A and C
What two properties of water are important for biological interactions? - answersThe
polarity of water
The cohesive properties of water
How many hydrogen bonds are formed between A and T? - answers2
What gives proteins a dominant role in biochemistry? - answersTheir ability to
spontaneously fold into complex three-dimensional structures
Which of the following is considered a noncovalent bond?
A) Electrostatic interactions
B) Hydrogen bonds
C) Van der Waals interactions
D) All of the above
E) None of the above - answersD) All of the above
The First Law of Thermodynamics states what? - answersThe total energy of a system
and its surroundings is constant
The Second Law of Thermodynamics states what? - answersThe total entropy of a
system and its surroundings always increases for a spontaneous process
, List atoms commonly found in biological molecules that are often hydrogen-bond
acceptors. - answersOxygen
Nitrogen
What is the [A-]/[HA] ratio when the weak acid is in a solution one pH unit below its
pKa? - answers1:10
If a particular reaction has a negative delta-G (Gibbs Free Energy), is it likely to occur? -
answersYes, it is spontaneous
What is the [H+] concentration in a urine sample that has a pH of 8? - answers10^-8 M
What happens to nonpolar molecules in water? - answersThey aggregate together
What type of chiral amino acids is found in proteins? - answersL
What is another name for dipolar molecules? - answersZwitterions
When a peptide bond is formed, what molecule is also made? - answersWater
Write the name, three letter code, and single letter code for the amino acid for the
following:
A) the amino acid with a pKa near neutral pH
B) disulfide bonds are formed by pairs of which amino acid
C) this amino acid residue disrupts the alpha-helix because its side chain contains a
unique ring structure that restricts bond rotation - answersA) Histidine, His, H
B) Cysteine, Cys, C
C) Proline, Pro, P
What determines a protein's function? - answersStructure
What is the name of the plot that allows one to investigate the likely orientation of
certain amino acid pairs? - answersRamachandran
What type of structure includes alpha-helices, beta-sheets, and turns? -
answersSecondary structure
What type of protein structure develops when two proteins combine to form one larger
protein? - answersQuaternary structure
What is responsible for the tertiary structure of proteins? - answersInteractions between
amino acid side chains
Which of these agents can denature proteins?
A) Salt
