WGU C785 Biochemistry Unit Exam Questions and Answers
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Which level of protein structure is determined by the sequence of amino
acids?
Secondary structure
Quaternary structure
Tertiary structure
Primary structure - CORRECT ANSWER Primary structure
The primary structure of a protein is simply the sequence of amino acids
held together by peptide bonds.
Which force is most influential in determining the secondary structure of
a protein?
Hydrophobic effect
Disulfide bonding
Hydrogen bonding
Electrostatic interactions - CORRECT ANSWER Hydrogen bonding
,The secondary structure of a protein is built by hydrogen bonds
between the carboxyl groups and amino groups on the backbones of the
amino acids.
Which amino acid would most likely participate in hydrogen bonds? -
CORRECT ANSWER Amino Acid structure 4
This is a polar, uncharged amino acid due to the OH group on the side
chain. Polar, uncharged amino acids containing oxygen or NH groups
make hydrogen bonds.
Which portion of the amino acid is inside the box?
The box is surrounding the section below the Alpha Carbon - CORRECT
ANSWER Side Chain
The side chain is the variable group of the amino acid, also called the R
group. Every amino acid has the same amino group, carboxylic acid
group, and an alpha carbon, but the side chain is different.
Which pair of amino acids will most likely interact through hydrophobic
forces between their side chains? - CORRECT ANSWER Both of these
amino acids are non-polar and therefore can interact together with a
hydrophobic interaction. Please note that the "S" in the amino acid on
the right is non-polar, while the "SH" group in answer choice D is polar.
The S must have an H to be polar and is otherwise non-polar.
Which portion of the amino acid is inside the box?
The box is over the Carbon at the Center of the chain - CORRECT
ANSWER Alpha Carbon
,The alpha carbon is the central carbon on an amino acid that holds
together the other groups of the amino acid. It is always attached to the
amino group, the carboxyl group, the side chain, and a single hydrogen.
It is part of the backbone of the amino acid and is found in every amino
acid.
Given the following amino acid structure, what is the strongest
intermolecular force it would participate in to stabilize a protein
structure?
Ionic bond
Disulfide bond
Hydrogen bond
Hydrophobic interaction - CORRECT ANSWER Hydrophobic interaction
The amino acid pictured only has CH groups in its side chain, and
therefore is non-polar. Non-polar amino acids make hydrophobic
interactions.
Which change would most likely result in a permanent modification of
an expressed protein's function?
An increase in the pH of a solution in which a protein is dissolved from
6.5 to 8.0, when it is known that the protein has an optimal activity of
pH 7.8
A mutation of the gene for a protein that leads to the substitution of a
hydrophobic amino acid with a nonpolar amino acid
, A mutation of the gene for a protein that leads to the substitution of a
nonpolar amino acid with a charged amino acid
The mutation of a gene for an enzyme involved in protein synthesis
following exposure to X-rays, causing the protein not to be synthesized -
CORRECT ANSWER A mutation of the gene for a protein that leads to
the substitution of a nonpolar amino acid with a charged amino acid.
The mutation of nonpolar amino acid to a charged amino acid will
disrupt the original hydrophobic interaction, permanently changing the
function of the protein.
Which property of enzymes is illustrated in the final step of the
enzymatic cycle?
Enzymes are specific.
Enzymes increase the reaction rate for a reaction.
Enzymes are reusable.
Enzymes lower the activation energy for a reaction. - CORRECT ANSWER
Enzymes are reusable.
In the final step of the enzymatic cycle, the product is released and the
enzyme is able to bind to a new substrate and begin the cycle again.
In the enzyme cycle, which step immediately follows induced fit?
Formation of the enzyme-substrate complex
Release of the product and enzyme complex
ACTUAL EXAM WITH A STUDY GUIDE AND PRACTICE EXAM |
GUARANTEED PASS | LATEST UPDATE
Which level of protein structure is determined by the sequence of amino
acids?
Secondary structure
Quaternary structure
Tertiary structure
Primary structure - CORRECT ANSWER Primary structure
The primary structure of a protein is simply the sequence of amino acids
held together by peptide bonds.
Which force is most influential in determining the secondary structure of
a protein?
Hydrophobic effect
Disulfide bonding
Hydrogen bonding
Electrostatic interactions - CORRECT ANSWER Hydrogen bonding
,The secondary structure of a protein is built by hydrogen bonds
between the carboxyl groups and amino groups on the backbones of the
amino acids.
Which amino acid would most likely participate in hydrogen bonds? -
CORRECT ANSWER Amino Acid structure 4
This is a polar, uncharged amino acid due to the OH group on the side
chain. Polar, uncharged amino acids containing oxygen or NH groups
make hydrogen bonds.
Which portion of the amino acid is inside the box?
The box is surrounding the section below the Alpha Carbon - CORRECT
ANSWER Side Chain
The side chain is the variable group of the amino acid, also called the R
group. Every amino acid has the same amino group, carboxylic acid
group, and an alpha carbon, but the side chain is different.
Which pair of amino acids will most likely interact through hydrophobic
forces between their side chains? - CORRECT ANSWER Both of these
amino acids are non-polar and therefore can interact together with a
hydrophobic interaction. Please note that the "S" in the amino acid on
the right is non-polar, while the "SH" group in answer choice D is polar.
The S must have an H to be polar and is otherwise non-polar.
Which portion of the amino acid is inside the box?
The box is over the Carbon at the Center of the chain - CORRECT
ANSWER Alpha Carbon
,The alpha carbon is the central carbon on an amino acid that holds
together the other groups of the amino acid. It is always attached to the
amino group, the carboxyl group, the side chain, and a single hydrogen.
It is part of the backbone of the amino acid and is found in every amino
acid.
Given the following amino acid structure, what is the strongest
intermolecular force it would participate in to stabilize a protein
structure?
Ionic bond
Disulfide bond
Hydrogen bond
Hydrophobic interaction - CORRECT ANSWER Hydrophobic interaction
The amino acid pictured only has CH groups in its side chain, and
therefore is non-polar. Non-polar amino acids make hydrophobic
interactions.
Which change would most likely result in a permanent modification of
an expressed protein's function?
An increase in the pH of a solution in which a protein is dissolved from
6.5 to 8.0, when it is known that the protein has an optimal activity of
pH 7.8
A mutation of the gene for a protein that leads to the substitution of a
hydrophobic amino acid with a nonpolar amino acid
, A mutation of the gene for a protein that leads to the substitution of a
nonpolar amino acid with a charged amino acid
The mutation of a gene for an enzyme involved in protein synthesis
following exposure to X-rays, causing the protein not to be synthesized -
CORRECT ANSWER A mutation of the gene for a protein that leads to
the substitution of a nonpolar amino acid with a charged amino acid.
The mutation of nonpolar amino acid to a charged amino acid will
disrupt the original hydrophobic interaction, permanently changing the
function of the protein.
Which property of enzymes is illustrated in the final step of the
enzymatic cycle?
Enzymes are specific.
Enzymes increase the reaction rate for a reaction.
Enzymes are reusable.
Enzymes lower the activation energy for a reaction. - CORRECT ANSWER
Enzymes are reusable.
In the final step of the enzymatic cycle, the product is released and the
enzyme is able to bind to a new substrate and begin the cycle again.
In the enzyme cycle, which step immediately follows induced fit?
Formation of the enzyme-substrate complex
Release of the product and enzyme complex
