PCB 3023 : Cell Biology Final Review Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.
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Course
PCB 3023 : Cell Biology
Institution
PCB 3023 : Cell Biology
Which of the following interactions are generally considered to be unfavorable? - Interaction
between Arg and Lys side chains at a pH of 7, assuming standard pKa values for Arg and Lys
Proteins can be denatured by a) Changing temperature b) Adding urea to solution c) Changing solvent d)
all choi...
PCB 3023 : Cell Biology Final Review
Which of the following interactions are generally considered to be unfavorable? - Interaction
between Arg and Lys side chains at a pH of 7, assuming standard pKa values for Arg and Lys
Proteins can be denatured by a) Changing temperature b) Adding urea to solution c) Changing solvent d)
all choices are correct - All choices are correct
If PAGE is carried out after subjecting the sample to SDS and beta-mercaptoethanol, then proteins will be
separated on the basis of - Mass
Which is the most abundant molecule in a bacterial cell? - 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 - All choices are correct
The major function of lysosome is - Degradation of macromolecules and organelles
Nucleotides contain a __________-carbon sugar that is bonded to a _________ phosphate and a base -
five, charged
Gln is - An uncharged polar amino acid
Which of the following is not true about fatty acids? - Cholesterol is a fatty acid
The bond between two sugar molecules formed via a dehydration process is called - glycosidic
bond
Which of the following statements is true about X-ray diffraction? - 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 - 10-2 M
The dynamics of lipid bilayers depend on a) Temperature b) Lipid chemistry c) Cholesterol concentration
d) All choices are correct. - All choices are correct
Which of the following statements about entropy is true? - Entropy is a measure of system
multiplicity
A protein domain - can be disordered
Van der Waals force is a kind of electromagnetic force - True
A person who carries blood group O can donate blood to a person who carries - Any of the three
blood groups, A, AB or O
In an alpha helix, residue i is hydrogen bonded to - Residue i+4 through its backbone
At physiological pH, phosphatidylserine has - 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. - 3000
Which is the following is true about the NaK pump? - It helps regulate cell volume
Ion channels cannot transport ions across membranes at rates faster than those predicted by Fick's law -
False
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 - -5.5 kcal/mol
, Which of the following statements is true about biological reactions? - 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 - 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? -
Voltage-gated Na+ channels
The action potential does not reverse direction on its own because - The voltage-gated Na+
channels cannot transition directly from inactive to open states
Myelination of axons - Increases the rate of nerve conduction
Neurotransmitters that open Cl- channels in the post-synaptic cell membrane - Produce a similar
effect as neurotransmitters that open K+ channels in the post-synaptic cell membrane
The microvilli of specialized epithelia are structurally composed of - Plasma membrane covering
an actin bundle
Which of the following could be affected by a mutation in the actin protein? I. Muscle contraction II. Cell
locomotion III. Mitosis IV. Cell shape - I, II, III and IV
Which of the following statement is true about intermediate filaments? - Intermediate filaments
play a key role in the formation of cell-cell junctions.
During actin filament reorganization, Cofilin - helps in removing hydrolyzed actin monomers from
actin filaments
The diameter of a microtubule is - 25 nm
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