PCB 3023 : Cell Biology Final Review
Practice Questions and Answers
If PAGE is carried out after subjecting the sample to SDS and beta-
mercaptoethanol, then proteins will be separated on the basis of -
Answer️️ -Mass
Which is the most abundant molecule in a bacterial cell? -
Answer️️...
Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences
PCB 3023 : Cell Biology Final Review
Practice Questions and Answers
If PAGE is carried out after subjecting the sample to SDS and beta-
mercaptoethanol, then proteins will be separated on the basis of -
Answer✔️✔️-Mass
Which is the most abundant molecule in a bacterial cell? -
Answer✔️✔️-Water
Which of the following is true about the molecular properties of
water? A) Water has a dipole moment. B) Water can form hydrogen
bonds with other water molecules. C) Water can form hydrogen
bonds with proteins, nucleic acids and phospholipids D) All choices
are correct - Answer✔️✔️-All choices are correct
The major function of lysosome is - Answer✔️✔️-Degradation of
macromolecules and organelles
Which of the following statements is true about interatomic bonds?
- Answer✔️✔️-The covalent bond between carbon and hydrogen is
slightly polar
Nucleotides contain a __________-carbon sugar that is bonded to a
_________ phosphate and a base - Answer✔️✔️-five, charged
Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences
Gln is - Answer✔️✔️-An uncharged polar amino acid
Which of the following is not true about fatty acids? - Answer✔️✔️-
Cholesterol is a fatty acid
The bond between two sugar molecules formed via a dehydration
process is called - Answer✔️✔️-glycosidic bond
Which of the following statements is true about X-ray diffraction? -
Answer✔️✔️-The structure obtained from X-ray diffraction can
contain crystal-packing artifacts
Proteins A and B bind to each other to form a complex, AB. Under
equilibrium the concentrations of A, B and AB are 10-2 M. The
dissociation constant of this reaction is - Answer✔️✔️-10-2 M
Proteins can be denatured by a) Changing temperature b) Adding
urea to solution c) Changing solvent d) all choices are correct -
Answer✔️✔️-All choices are correct
The dynamics of lipid bilayers depend on a) Temperature b) Lipid
chemistry c) Cholesterol concentration d) All choices are correct. -
Answer✔️✔️-All choices are correct
Which of the following statements about entropy is true? -
Answer✔️✔️-Entropy is a measure of system multiplicity
Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences
Which of the following interactions are generally considered to be
unfavorable? - Answer✔️✔️-Interaction between Arg and Lys side
chains at a pH of 7, assuming standard pKa values for Arg and Lys
Van der Waals force is a kind of electromagnetic force - Answer✔️✔️-
True
A person who carries blood group O can donate blood to a person
who carries - Answer✔️✔️-Any of the three blood groups, A, AB or O
In an alpha helix, residue i is hydrogen bonded to - Answer✔️✔️-
Residue i+4 through its backbone
At physiological pH, phosphatidylserine has - Answer✔️✔️-a net
negative charge
The permeability of a lipid bilayer for glucose is 10-8 cm/sec.
Consider a cell whose glucose transporter is knocked out. If it is
placed in a solution that contains 1 mM glucose, how many glucose
molecules will enter the cell in 10 seconds? Assume that the cell
contains no glucose and the surface area of its plasma membrane is
5 μm2. - Answer✔️✔️-3000
Which is the following is true about the NaK pump? - Answer✔️✔️-It
helps regulate cell volume
Ion channels cannot transport ions across membranes at rates
faster than those predicted by Fick's law - Answer✔️✔️-False
Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences
Proteins A, B and C bind to each other to form a complex, ABC.
Under equilibrium the concentrations of A, B, C and ABC are 10-2
M. The standard free energy of this reaction at T=300 K is -
Answer✔️✔️--5.5 kcal/mol
Which of the following statements is true about biological reactions?
- Answer✔️✔️-Some biological reactions can occur without enzymes
Assume that the kinetics of a phosphorylation reaction carried out
by a kinase can be appropriately described by the Michaelis-Menten
relationship. Competitive inhibition of this kinase by a drug
molecule will - Answer✔️✔️-Alter the slope of the line in the
Lineweaver-Burk plot, but not the maximum rate of the reaction.
Which channel needs to be in the open state during the rising
phase of an action potential? - Answer✔️✔️-Voltage-gated Na+
channels
The action potential does not reverse direction on its own because -
Answer✔️✔️-The voltage-gated Na+ channels cannot transition
directly from inactive to open states
Myelination of axons - Answer✔️✔️-Increases the rate of nerve
conduction
Neurotransmitters that open Cl- channels in the post-synaptic cell
membrane - Answer✔️✔️-Produce a similar effect as
4
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