Navigation » List of Schools » Texas State University » Biology » Bio 3300 – Cell and Molecular Biology » Summer 2020 » Exam 1
Below are the questions for the exam with the choices of answers:
Question #1
A Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the between charged atoms.
B Covalent bonds require carbon whereas ionic bonds do not.
C Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms
D Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms.
E Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms.
Question #2
A The infectious strain cannot be killed by heating
B The harmless strain somehow revived the heat-killed pathogenic bacteria.
C The heat-killed pathogenic bacteria “transformed” the harmless strain into a lethal one.
D the mice had lost their immunity to infection with S. pneumoniae
Question #3
A organization of a polypeptide chain into an a-helix or β-Pleated sheet
B overall protein structure resulting from the aggregation of two or more polypeptide subunits
C order in which amino acids are joined in a polypeptide chain
D bonding together of several polypeptide chains by weak bonds
E unique three-dimensional shape of the fully folded polypeptide
Question #4
A replication, transcription, translation
B replication, translation, transcription
C translation, transcription, replication
D translation, replication, transcription
Question #5
A All nucleotide are the same
B The sugar and the base
C The sugar
D The base
E The phosphate group
Question #6
A A salt gradient
B A density gradient
C A pH gradient
D A temperature gradient
Question #7
A the rate of the reaction at ½ the maximum rate
B the maximum velocity of the catalytic reaction
C the rate of product release by the enzyme
D recognition of the substrate by the enzyme
Question #8
A using the energy of ATP hydrolysis to move nucleosomes
B recruiting other enzymes
C denaturing the DNA by interfering with hydrogen-bonding between base pairs.
D modifying the N-terminal tails of core histones
Question #9
A barrier destruction
B heterochromatization
C epigenetic inheritance
D Euchromatin depletion
Question #10
A membrane association
B protein degradation
C protein secretion
D nuclear translocation
Question #11
A feedback inhibition
B allosteric activation
C oxidative phosphorylation
D substrate-level phosphorylation
Question #12
A things are moving from higher to lower concentration
B ΔH – T ΔS =0
C ΔH and ΔS are both positive and TΔH >H
D ΔH – T ΔS >0
E ΔH – T ΔS <0
Question #13
A take place when the cells are at unusually high temperatures
B are catalyzed by enzyme
C maybe coupled to the hydrolysis of ATP
D take place very slowly
E are aided by various metal ions that act as catalysts
Question #14
A The activity of enzymes cannot be regulated by factors in their immediate
B Enzymes are proteins that function as catalysts
C Enzymes reduce activation energy for the reactions they catalyze
D An enzyme maybe used many times over for a specific reaction.
E Enzymes display specificity for a certain molecules to which they attach or which attach to them
Question #15
A low affinity for their substrate
B low velocity of reaction
C high Vmax
D . high affinity for their substrate
Question #16
A negative feedback and allosteric inhibition/activation
B non-competitive inhibition and positive feedback.
C competitive and non-competitive inhibition
D irreversible inhibition and destruction of the enzyme molecule
E negative feed-forward inhibition and homosteric activation
Question #17
A the synthesis of large molecules from small molecules is exergonic
B The Earth is an open system
C every chemical transformed represents a loss of energy
D entropy increases in a closed system
E life exists at the expense of greater energy than it contains
Question #18
A They chemically modify the DNA, changing the affinity between the histone octamer and the DNA
B They chemically modify core histones to alter the affinity between the histone octamer and the DNA.
C They remove histone H1 from the linker DNA adjacent to the core histone octamer.
D They use energy derived from ATP hydrolysis to change the relative position of the DNA and the core histone octamer
Question #19
A The polypeptide remains denatured.
B The polypeptide returns to its original conformation.
C The polypeptide adopts a new, stable conformation.
D The polypeptide forms solid aggregates and precipitates out of solution.
Question #20
A displacement of histone H1
B gene silencing
C increase in gene expression
D recruitment of remodeling complexes
Question #21
A C18H30015
B C3H603
C C18H36018
D C6H1005
E C18H32016
Question #22
A nucleosomes
B nuclear pores
C heterochromatin
D euchromatin
E chromosome
Question #23
A gene
B genetic code
C genome.
D coding sequence
Question #24
A using the formula : G-A=C+T
B Double-stranded genomes have equal amounts of A and T
C Single-stranded genomes have a higher rate of mutation
D single-stranded genomes always have a large percentage of purines
Question #25
A 5’TGCAAT3’
B 5’TAACGT3’
C 5’UAACGU3’
D 3’UAACGU5’
E 5’UGCAAU3’
Question #26
A fluorescence
B confocal
C bring-field
D transmission electron
E phase-contrast
F scanning electron
Question #27
A At either the N or C terminus
B inside the catalytic domain
C somewhere outside of the catalytic domain
D in the exact center of the protein
E in allosteric activator domain
Question #28
A starch
B DNA
C Protein
D cellulose
E glucose
Question #29
A systems biology
B proteomics
C structural biology
D genomics
Question #30
A an amino group
B a β-Pleated Sheet
C a peptide bond
D a disulfide bond
Question #31
A 2,4,5
B 2,3,5
C 2,3,5
D 1,2,4,5
E 1,4,5
Question #32
A filtering
B absorption
C wavelength
D intensity
Question #33
A methane
B molecular oxygen
C propane
D water
Question #34
A membrane support
B vesicle transport
C cell motility
D cell division
Question #35
A RNA can carry information and catalyze chemical reactions
B Fossil evidence of such a molecule was recently discovered.
C RNA is the only type of molecule that can catalyze a chemical reaction.
D Self-replicating molecules of RNA exist today, in human cells
Question #36
A 200g
B 400g
C 160g
D 800g
E 125g
Question #37
A primarily producing proteins for secretion
B digesting large food particles
C constructing an extensive cell wall or extracellular matrix
D enlarging its vacuole
E primarily producing proteins in the cytosol
Question #38
A protein
B sugar
C fat
D fiber
Question #39
A Both contain endoplasmic reticulum and Golgi bodies.
B Both can reproduce on their own outside of the cell
C Both contain ribosomes that are identical to ribosomes of the eukaryotic
D Both have bacteria-like polysaccharide cell walls
E Both contain DNA molecules
Question #40
A in regions of the protein that determine packaging into the virus capsid
B in or near the active site
C at an allosteric site
D at a cofactor binding site
E Such mutations could occur anywhere with equal probability
Question #41
A Golgi network
B nuclear envelope
C Mitochondrial membrane
D plasma membrane
Question #42
A RNA
B Ribozyme
C DNA
D complex cells
E ATP
Question #43
A The cells on Mars gain energy by using minerals found only on Mars., not on Earth.
B Life on Mars tolerates the much higher levels of radiation found on Mars than life on Earth, which could be poisoned by the radiation
C Studies of the earliest Mars and Earth cells show that they can both survive for many years in the harsh vacuum of space
D Life on Mars uses a different genetic code (DNA & RNA) than life on Earth
Question #44
A ionic bonds
B van der Waals interactions
C hydrogen bonds.
D nonpolar covalent bonds
E polar covalent bonds
Question #45
A rapid rate of reproduction
B amenability to genetic manipulation
C ability to grow under controlled conditions.
D genome partially or completely sequenced
E All of the above is correct.
Question #46
A 80
B It is impossible to tell from the information given.
C 20
D 40
E 10
Question #47
A polar covalent bond formed between the oxygen and a hydrogen of single water molecule
B covalent bond formed between the hydrogen of one water molecule and the oxygen of another water molecule
C ionic bonds formed between the hydrogen of one water molecule and the oxygen of another water molecule
D hydrogen bond formed between the hydrogen of one water molecule and the oxygen of another water molecule
Question #48
A ionic bonds
B van der Waals interactions
C hydrogen bonds
D covalent bonds
Question #49
A has the ability to resolve cellular components as small as 2 nm.
B employs a light microscope and requires that samples be fixed and stained in order to reveal cellular details
C scans the specimen with a focused laser beam to obtain a series of two-dimensional optical sections, which can be used to reconstruct an image of the specimen in three dimensions. The laser excites a fluorescent dye molecule, and the emitted light from each illuminated point is captured through a pinhole and recorded by a detector.
D uses a light microscope with an optical component to take advantage of the different refractive indices of light passing through different regions of the cell
E requires coating the sample with a thin layer of a heavy metal to produce three dimensional images of the surface of a sample
F requires the use of two sets of filters. The first filter narrows the wavelength range that reaches the specimen and the second blocks out all wavelengths that pass back up to the eyepiece except for those emitted by the dye in the sample.