CSU BMS 300 EXAM 1 QUESTIONS WITH VERIFIED
ACCURATE ANSWERS
A bond in which electrons are shared between atoms is a _______ bond.
A. Hydrogen
B. Covalent
C. Ionic
D. Dipole moment - Answers - B. Covalent
- Only a covalent bond has sharing of electrons. The other bonds listed are electrostatic
interactions.
Water molecules are attracted to each other and form ________ bonds.
A. Covalent
B. Oxygen
C. Hydrogen
D. Ionic - Answers - C. Hydrogen
- Although the hydrogen and oxygen atoms within a water molecule covalently bond,
interactions between water molecules are hydrogen bonds. These electrostatic
interactions are responsible for keeping water as a liquid through a wide range of
temperatures and for surface tension.
Sodium (Na+) will be attracted to what portion of a water molecule.
A. Oxygen
B. Hydrogen
C. None of it - Answers - A. Oxygen
- Since sodium has a positive charge, it will be attracted to the partial negative charge of
the oxygen atom in a water molecule.
_______ is the diffusion of water molecules through a semipermeable membrane from a
place of higher water concentration to a place of lower water concentration until the
concentration on both sides is equal.
A. Osmosis
B. Acetylation
C. Hydration - Answers - A. Osmosis
- Osmosis is just the diffusion of water
Which of the following is NOT true about hydrophobic molecules
A. They interact with the dipole moment in water
B. They have equal sharing of electrons across all the atoms in the molecule
C. The diffuse easily in water - Answers - A. The diffuse easily in water
-Hydrophobic molecules have equal sharing of electrons, so there is no charge to
interact with water or other hydrophilic molecules. They are "water fearing" and will not
diffuse in water.
,In triglycerides, a fatty acid is joined to glycerol by a(n) __________ bond
A. Ionic
B. Hydrogen
C. Covalent - Answers - C. Covalent
- Fatty acids and glycerol form ester bonds, a type of covalent bond
Two solutions are separated by a membrane that contains only channels permeable to
water (aquaporins). The solution in the left-hand compartment contains 30 millimolar
NaCl, which dissociates completely, and the right hand compartment contains 60
millimolar urea which is a small, charged molecule that does not dissociate. Which of
the following statements is correct?
A.Water will not flow because osmotic forces are balanced.
B. Water will flow from right to left because the osmotic concentration of the NaCl is
higher.
C. Water will flow from left to right because the osmotic concentration of the urea is
higher.
D. Urea will diffuse from right to left. - Answers - A.Water will not flow because osmotic
forces are balanced.
- If a two atom molecule of "X" moles completely dissociates, it become "X" moles of
each atom. In this example, 30 millimoles of NaCl become 30 millimoles of Na and 30
millimoles of Cl making the solution 60 millimolar (30 + 30). Therefore, both sides are
osmotically balanced and there will be no net flow of water.
Which of the following is the least stable form of phospholipid structure?
A. Liposome
B. Micelle
C. Planar bilayer - Answers - B. Micelle
- Planar bilayer are the most stable formation and are used in cell membranes.
Liposomes are very small planar bilayer formations. Micelles are only a single layer of
phospholipids and are very unstable.
In order to form a chain of amino acids, multiple amino acids are linked via what bond?
Select all that apply.
A. Peptide Bond
B. Covalent Bond
C. Ionic Bond
D. Hydrogen Bonds - Answers - A and B: Peptide Bond and Covalent Bond
- Amino acids are the building blocks of peptides and proteins. They form by peptide
bonds, a type of covalent bond, between adjacent amino acids.
The portion of an amino acid that differentiates one amino acid from another is the
_____.
A. N-Terminus
B. P-Group
, C. C-Terminus
D. R-Group - Answers - D. R-Group
- All amino acids have the same backbone structure and only differ in their R-groups.
Alpha helices form due to ______ bonding of amino acids ______ the strand. Beta
pleated sheets form due to ______ bonding ______ adjacent strands.
Word Bank:
- Hydrogen
-Covalent
-Between,
-Within - Answers - Hydrogen, Within, Hydrogen, Between
_________________ interact with water to form the _________ structure of proteins.
A. R-groups, secondary
B. R-groups, tertiary
C. Hydrogen bonds, secondary
D. Hydrogen bonds, tertiary - Answers - B. R-groups, tertiary
- Protein folding in the tertiary structure is due to the R-group interacting with it's
environment. If the environment is hydrophilic (like water), hydrophilic R-groups will fold
outward and hydrophobic R-groups will "hide" on the interior of the protein
R groups can be ...
Select all correct answers.
A. charged
B. uncharged
C. polar
D. none of the answers are correct - Answers - A. charged
B. uncharged
C. polar
- R-groups can be hydrophobic (uncharged) or hydrophilic (charged and/or polar). You
will not need to know the R-groups or their individual characteristics. Just understand
how a hydrophobic or hydrophilic R-group will react in hydrophobic or hydrophilic
solutions.
The amino acids that can be found on the outside of a protein when placed in water are:
A. hydrophilic
B. hydrophobic
C. I don't know.. - Answers - A. hydrophilic
- Since water is hydrophilic, it will attract hydrophilic R-groups. Therefore the protein will
fold so that hydrophilic R-groups are on the outside and hydrophobic R-groups are on
the inside.
Most transmembrane channels form which type of structure within the plasma
membrane?
A. beta pleated sheets
ACCURATE ANSWERS
A bond in which electrons are shared between atoms is a _______ bond.
A. Hydrogen
B. Covalent
C. Ionic
D. Dipole moment - Answers - B. Covalent
- Only a covalent bond has sharing of electrons. The other bonds listed are electrostatic
interactions.
Water molecules are attracted to each other and form ________ bonds.
A. Covalent
B. Oxygen
C. Hydrogen
D. Ionic - Answers - C. Hydrogen
- Although the hydrogen and oxygen atoms within a water molecule covalently bond,
interactions between water molecules are hydrogen bonds. These electrostatic
interactions are responsible for keeping water as a liquid through a wide range of
temperatures and for surface tension.
Sodium (Na+) will be attracted to what portion of a water molecule.
A. Oxygen
B. Hydrogen
C. None of it - Answers - A. Oxygen
- Since sodium has a positive charge, it will be attracted to the partial negative charge of
the oxygen atom in a water molecule.
_______ is the diffusion of water molecules through a semipermeable membrane from a
place of higher water concentration to a place of lower water concentration until the
concentration on both sides is equal.
A. Osmosis
B. Acetylation
C. Hydration - Answers - A. Osmosis
- Osmosis is just the diffusion of water
Which of the following is NOT true about hydrophobic molecules
A. They interact with the dipole moment in water
B. They have equal sharing of electrons across all the atoms in the molecule
C. The diffuse easily in water - Answers - A. The diffuse easily in water
-Hydrophobic molecules have equal sharing of electrons, so there is no charge to
interact with water or other hydrophilic molecules. They are "water fearing" and will not
diffuse in water.
,In triglycerides, a fatty acid is joined to glycerol by a(n) __________ bond
A. Ionic
B. Hydrogen
C. Covalent - Answers - C. Covalent
- Fatty acids and glycerol form ester bonds, a type of covalent bond
Two solutions are separated by a membrane that contains only channels permeable to
water (aquaporins). The solution in the left-hand compartment contains 30 millimolar
NaCl, which dissociates completely, and the right hand compartment contains 60
millimolar urea which is a small, charged molecule that does not dissociate. Which of
the following statements is correct?
A.Water will not flow because osmotic forces are balanced.
B. Water will flow from right to left because the osmotic concentration of the NaCl is
higher.
C. Water will flow from left to right because the osmotic concentration of the urea is
higher.
D. Urea will diffuse from right to left. - Answers - A.Water will not flow because osmotic
forces are balanced.
- If a two atom molecule of "X" moles completely dissociates, it become "X" moles of
each atom. In this example, 30 millimoles of NaCl become 30 millimoles of Na and 30
millimoles of Cl making the solution 60 millimolar (30 + 30). Therefore, both sides are
osmotically balanced and there will be no net flow of water.
Which of the following is the least stable form of phospholipid structure?
A. Liposome
B. Micelle
C. Planar bilayer - Answers - B. Micelle
- Planar bilayer are the most stable formation and are used in cell membranes.
Liposomes are very small planar bilayer formations. Micelles are only a single layer of
phospholipids and are very unstable.
In order to form a chain of amino acids, multiple amino acids are linked via what bond?
Select all that apply.
A. Peptide Bond
B. Covalent Bond
C. Ionic Bond
D. Hydrogen Bonds - Answers - A and B: Peptide Bond and Covalent Bond
- Amino acids are the building blocks of peptides and proteins. They form by peptide
bonds, a type of covalent bond, between adjacent amino acids.
The portion of an amino acid that differentiates one amino acid from another is the
_____.
A. N-Terminus
B. P-Group
, C. C-Terminus
D. R-Group - Answers - D. R-Group
- All amino acids have the same backbone structure and only differ in their R-groups.
Alpha helices form due to ______ bonding of amino acids ______ the strand. Beta
pleated sheets form due to ______ bonding ______ adjacent strands.
Word Bank:
- Hydrogen
-Covalent
-Between,
-Within - Answers - Hydrogen, Within, Hydrogen, Between
_________________ interact with water to form the _________ structure of proteins.
A. R-groups, secondary
B. R-groups, tertiary
C. Hydrogen bonds, secondary
D. Hydrogen bonds, tertiary - Answers - B. R-groups, tertiary
- Protein folding in the tertiary structure is due to the R-group interacting with it's
environment. If the environment is hydrophilic (like water), hydrophilic R-groups will fold
outward and hydrophobic R-groups will "hide" on the interior of the protein
R groups can be ...
Select all correct answers.
A. charged
B. uncharged
C. polar
D. none of the answers are correct - Answers - A. charged
B. uncharged
C. polar
- R-groups can be hydrophobic (uncharged) or hydrophilic (charged and/or polar). You
will not need to know the R-groups or their individual characteristics. Just understand
how a hydrophobic or hydrophilic R-group will react in hydrophobic or hydrophilic
solutions.
The amino acids that can be found on the outside of a protein when placed in water are:
A. hydrophilic
B. hydrophobic
C. I don't know.. - Answers - A. hydrophilic
- Since water is hydrophilic, it will attract hydrophilic R-groups. Therefore the protein will
fold so that hydrophilic R-groups are on the outside and hydrophobic R-groups are on
the inside.
Most transmembrane channels form which type of structure within the plasma
membrane?
A. beta pleated sheets
