Biophysics Multiple Choice
Explore the Fundamentals of Biophysics
Test your knowledge of biophysics with our comprehensive quiz! This quiz covers various topics ranging from the origins of life to the intricacies of DNA structure. Whether you're a student, educator, or science enthusiast, this quiz is designed to challenge and expand your understanding of biophysics.
Key Features:
- 30 thought-provoking questions
- Detailed coverage of essential biophysical concepts
- Instant feedback on your answers
While current theories do not agree on the exact origins of life, they do agree that all life on Earth once existed as
RNA
Astrobacteria
An Fe-S chemical reaction
Extremophiles
Amino acids
Using a closed system consisting of gases, water, and an electric discharge, the Miller-Urey
Nucleic acids
Amino acids
Amino and nucleic acids
Lipids and amino acids
Polysaccharides
True or False: Prebiotic life existed at least 3.5 bya
True
False
In biological systems, the dominant heat transport mechanism is
Conduction
Diffraction
Radiation
convection
Electromagnetic
Entropy is
The measure of disorder
Related to the number of states of system
Proportional to the temperature
Determined by the equipartition theorem
Always stays the same
The equipartition theorem says that 1/2 kT of energy is given to each particle’s
Degree of freedom
Kinetic energy
Speed
Mass
Entropy
What does it mean if the Gibbs energy change for a process is negative?
The process is not good for living things.
The process is increasing entropy.
The process is not spontaneous.
The process is spontaneous.
The First Law of Thermodynamics states that
E=Q+W
PV=NkT
E=3/2NkT
Entropy always increases or stays the same
E=Q-W
If we use the Gibbs energy change to evaluate a biophysical process, we can effectively ignore the second law of thermodynamics because
The second law is irrelevant to biological systems.
The second law only applies when entropy is increasing.
An increase in entropy is favorable for the Gibbs energy change.
The second law is built into the formula for Gibbs energy
Gibbs was able to show that the second law no longer applies nowadays.
The average kinetic energy for a monatomic molecule of ideal gas is
1/2 kT
1 kT
2/3 kT
5/2 kT
3/2 kT
Polar bonds are
Ionic bonds.
Covalent bonds in which the electrons are shared unevenly.
Stronger than hydrogen bonds.
A and B
B and C
Carbon atoms usually form how many covalent bonds?
2
4
6
8
Which of the following statements about covalent bonds are true?
S1. Covalent bonds result from sharing of electrons between atoms
S2. Covalent bonds are polar if electrons are shared unevenly
S3. Single covalent bonds allow free rotation of the atoms or groups of atoms on each side of the bond.
S4. Double covalent bonds allow free rotation of the atoms or groups of atoms on each side of the bond.
S5. Covalent bonds may be single, double, or triple, depending on the number of electrons that are shared.
S6. Covalent bonds are stronger than hydrogen bonds.
S1, S2, S3, S4 and S5
S1, S3,S5 and S6
S1, S2, S3,S5 and S6
S1, S2, S4, S5 and S6
In liquid water, the angle between formed by H-O-H is
109.5
106.5
104.5
103.5
107.5
The Gibbs energy change of bringing a hydrophobic molecule in contact with water is unfavorable primarily due to a
Large decrease in the hydrophobic molecule's entropy.
Large increase in the hydrophobic molecule's entropy.
Large decrease in the water's entropy.
. Large increase in the water's entropy
Positive Gibbs energy change.
What is the electric dipole moment of water
1.8 D
38 e⋅pm
6.1 × 10−30 C⋅m
A-C
B-C
Van der Waals forces are described by what interaction?
Charge-charge
. dipole-dipole
Charge-dipole
Hydrogen bonding
Electronegative
. The energy of a typical hydrogen bond is approximately 0.03 x 10- 18 J. At room temperature (300 K), this corresponds to approximately
7 kT
14 kT
3 kT
25 kT
1 kT
DNA is a
Heteropolymer.
Homopolymer.
Peptide polymer.
Ribonucleotide polymer
DNA and RNA are examples of
Nucleic acids
Nucleotides
Proteins
Lipids
The contour length in the freely jointed chain model is the product of what?
The length of a segment and the number of segments.
The square root of the length of a chain segment.
The number of segments and the square root of the length of each segment.
The difference between the length of one end of the chain and the other.
The nitrogenous base in DNA that is not found in RNA is
Adenine.
Guanine.
Thymine.
Cytosine.
The helical shape of DNA is due primarily to
Aromatic side chains.
Base stacking.
Hydrogen bonds.
Van der Waals constant.
In the DNA double helix, what gets paired with the A (adenine) nucleotide?
G
T
C
U
True or False: Supercoiling is how DNA gets tightly packaged
True
False
Three successive nucleotides along a DNA molecule that encodes an amino acid is called a
Polypeptide
Codon
Enzyme
Carboxyl group
Alpha helix
B and C
True or False: Worm-like chain model assumes that DNA can bend at large angles
True
False
What is a topological invariant?
A property that does not change under smooth deformations of shape.
The writhe
The linking number
A and B
B and C
C and A
The process of converting a nucleotide sequence of DNA into an mRNA molecule is called what?
Transcription
Translation
Transformation
Trans fat
The weight of an E. coli DNA molecule is about 3.1×109 Da. The average weight of a nucleotide pair is 660 Da, and each nucleotide pair contributes 0.34 nm to the overall DNA length. The length of the E. coli DNA is approximately
200 nm
2 mm
5 µm
100 µm
0.2 mm
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