MBLG1001 : MBLG1001 - Course Review
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1. | In addition to identifying the genetic material, the experiments of Avery, MacLeod, and McCarty with different strains of Streptococcus pneumoniae demonstrated that | ||||||||||
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2. | In order to show that DNA in cell extracts is responsible for genetic transformation in Streptococcus pneumoniae, important corroborating evidence should indicate that _______ also destroy transforming activity. | ||||||||||
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3. | Based on what you have learned about the experiments conducted by Griffith and Avery and colleagues with bacteria, which of the following would result in transformation of living R cells? | ||||||||||
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4. | A-T base pairs in a DNA double helix | ||||||||||
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5. | If 23 percent of the bases in a sample of double-stranded DNA are adenine, what percentage of the bases are uracil? | ||||||||||
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6. | The uniform diameter of the DNA structure provides evidence for | ||||||||||
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7. | If a sequence of one strand of DNA is 5â²-TGACTATC-3â², what is the complementary strand? | ||||||||||
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8. | What structural aspect of the DNA facilitates dissociation of the two DNA strands for replication? | ||||||||||
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9. | If the MeselsonâStahl density gradient experiment had resulted in two bands of DNA molecules after only one round of replication, one containing only 15N and the second only 14N, this result would have indicated that replication was | ||||||||||
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10. | The nucleoside analogue acyclovir, which is used to treat herpes simplex virus (HSV) infections, lacks a 3â² hydroxyl group (âOH). Predict what will happen if the host cell DNA polymerase incorporates a molecule of acyclovir into an elongating strand of HSV DNA. | ||||||||||
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11. | Which of the following does not demonstrate the stability of the DNA double helix? | ||||||||||
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12. | What effect would a primase inhibitor have on DNA replication? | ||||||||||
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13. | To replicate their DNA in a timely manner, most eukaryotic chromosomes | ||||||||||
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14. | Which statement about DNA replication is false? | ||||||||||
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15. | In many eukaryotes, there are repetitive sequences called telomeres at the ends of chromosomes. After successive rounds of DNA replication, the _______ strand becomes shorter. In some cells, an enzyme called _______ repairs the shortened strand. | ||||||||||
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16. | A researcher studies normal human fibroblast cells. They can be maintained in culture but die off after about 30 cell generations. Unexpectedly, a colony of cells continues to survive and divide past 30 generations. Which scenario is most likely true for these cells? | ||||||||||
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17. | If DNA polymerase III introduces an incorrect nucleotide, what is the first corrective action made by the DNA repair system? | ||||||||||
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18. | Choose the correct order of the following four events in the excision repair of DNA: (1) Base-paired DNA is made complementary to the template. (2) Damaged bases are recognized. (3) DNA ligase seals the new strand to existing DNA. (4) Part of a single strand is excised. | ||||||||||
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19. | Six complete cycles of PCR should result in a _______-fold increase in the amount of DNA. | ||||||||||
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20. | When double-stranded DNA is heated to temperatures above 90°C, it denatures. Denaturation is a process that | ||||||||||
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Material Science
Question 1
Muscle fibers slide smoothly across each other in both directions.
True
False
Question 2
Cell membranes are composed of single layers of fat molecules.
True
False
Question 3
In mammals, the percentage composition of fats and minerals is roughly the same.
True
False
Question 4
Both RNA and DNA have a double helix structure.
True
False
Question 5
The primary constituents of muscles are
a) | the proteins kerotin and actin | |
b) | the proteins lycine and actin | |
c) | the proteins actin and liposine | |
d) | the proteins glycine and lycine | |
e) | the proteins myocin and actin |
Question 6
Hydroxyapatite is a component of endoskeletons.
True
False
Question 7
There are thousands of types of amino acids.
True
False
Question 8
Amorphous silicon is a component of some biomaterials.
True
False
Question 9
The biosynthesis of both collagen and polysaccharides starts in the cell nucleus.
True
False
Question 10
After going through alkyline hydrolysis, the remaining solids are primarily hydroxyapatite.
True
False
Question 11
Calcium carbonate is a mineral found in some biomaterials.
True
False
Question 12
Proteins, chitin, and cellulose are build up from proteins
True
False
Question 13
There are thousands of types of proteins.
True
False
Question 14
Chitin is the most abundant natural polymer.
True
False
Question 15
Keratin is formed from a structure of living cells.
True
False
Question 16
Some biopolymers are hard.
True
False
Question 17
Polymeric biomaterials are comprised of collagen and elastin.
True
False
Question 18
Cell membranes are made of double layers of proteins.
True
False
Question 19
Which is NOT an example of a hard biopolymer?
a)Eggs | ||
b)Insect Shells | ||
c)Hooves | ||
d)Nails | ||
e)Cellulose |
Question 20
Polysaccharides are built up hierarchically from amino acids.
True
False
Question 21
Unit cells have faces that are
a) | rhombus | |
b) | square | |
c) | rectangular | |
d) | parallelegrams | |
e) | circular |
Question 22
Unit cells are
a)the building blocks of crystalline material | ||
b)the building blocks of DNA | ||
c)the building blocks of polymers | ||
d)the building blocks of amorphous materials | ||
e)the building blocks of biomaterials |
Question 23
Which radioactive semi-metal is the only element with a Simple-Cubic (SC) structure?
a)Polonium | ||
b)Uranium | ||
c)Radium | ||
d)Plutonium | ||
e)Dilthium |
Question 24
The common crystal structures in metal are
a)FCC, BCC, HCP | ||
b)FCC, BCC, HCP, and SC | ||
c)HCC, BCC, FCP | ||
d)HCC, BCC, FCP and SC | ||
e)FCC, SEC, BCC |
Question 25
Diffraction results in
a)constructive interference | ||
b)delamination of the planes | ||
c)reverse polarization | ||
d)altered planar spacing | ||
e)destructive interference |
Question 26
Unit cell indexing schemes provide
a)location information for grain boundaries | ||
b)descriptions of the atoms, planes, and axis directions | ||
c)diffraction indexes for the crystal material | ||
d)the location of the unit cell in the larger crystalline matrix | ||
e)the packing arrangement |
Question 27
Hexagonal crystal structures cannot be close-packed.
True
False
Question 28
To determine crystal structure and spacing, scientists use
a)magnetic resonance imaging | ||
b)X-ray diffraction | ||
c)optical microscopes | ||
d)scanning electron microscopes | ||
e)atomic force microscopes |
Question 29
A scanning probe (aka atomic force) microscope can be used to image and manipulate individual atoms.
True
False
Question 30
Crystal planar density is taken as
a)the number of atoms per unit area for a plane | ||
b)the planar stacking order | ||
c)the number of atoms that are closely packed | ||
d)the number of equivalent atoms per unit cell | ||
e)the number of atoms per unit length for an axis |
Question 31
The atomic packing factor represents
a)the mass ratio of the unit cell | ||
b)the number of nearest-neighbor atoms | ||
c)the fraction of solid sphere volume in the unit cell | ||
d)the unit cell edge length (a) divided by the atomic radius (R) | ||
e)the density of the material |
Question 32
When an elemental solid can have more than one crystal structure, it is said to have
a)allotropy | ||
b)polymorphism | ||
c)polytropy | ||
d)elemorphism | ||
e)anthropomorphis |
Question 33
The crystallographic linear density
a)is determined by the atomic packing factor | ||
b)is six for HCP unit cells | ||
c)is five for BCP unit cells | ||
d)is determined by the coordination number | ||
e)is how many atoms lie along a unit length in that direction |
Question 34
Bragg's law specifies
a)the condition for when electrons will be refracted upon striking a crystal | ||
b)the condition for when light will be polarized upon striking a crystal | ||
c)the condition for when x-rays will be absorbed upon striking a crystal | ||
d)the condition for when x-rays will be refracted upon striking a crystal | ||
e)the condition for when light will be refracted upon striking a crystal |
Question 35
Two features of a crystal unit cell structure are
a)atomic number and elemental packing factor | ||
b)the number of interstitial and host atoms | ||
c)coordination number and atomic packing factor | ||
d)the number of faces and the number of atoms | ||
e)the number of substitutional and interstitial atoms |
Question 36
Imperfections in semiconductors are used to create transistors and other electronic devices.
True
False
Question 37
The majority of crystalline solids are single crystals
True
False
Question 38
The grain structure of a polycrystalline material can be observed in the material without significant preparation.
True
False
Question 39
There are three types of electron microscopes, Transmission (TEM), Scanning (SEM), and Tunneling (TUEM).
True
False
Question 40
Defects are important for solid catalysts
True
False
Question 41
The mean intercept length is a measure of grain diameter.
True
False
Question 42
Imperfections in materials do not generally change their properties.
True
False
Question 43
The mean intercept length is computed from the average length of a grain boundary edge.
True
False
Question 44
Catalysts chemically combine with the reactant molecules in order to speed up the reaction.
True
False
Question 45
For a particular material, the higher the temperature the greater the number of vacancies.
True
False
Question 46
A twin boundary is a linear defect where the screw angles on each side of the boundary are equal.
True
False
Question 47
The regular pattern of crystal order is disrupted at a grain boundary.
True
False
Question 48
Solid solutions can only be formed by liquid material cooling to a solid.
True
False
Question 49
Alloys do not usually have significantly difference properties of the constituent metals.
True
False
Question 50
When an atom is missing from a crystal structure position, it is referred to as a self-interstitial.
True
False