BLG 143 Lecture Notes - Lecture 2: Electron Shell, Chemical Polarity, Chemical Bond
Document Summary
Get access
Related Documents
Related Questions
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
Question 401 pts
Kinetic energy is the stored energy that can be used for motion.
True |
False |
Flag this Question
Question 411 pts
When an electron is transferred from one atom to another, and the two atoms are then electrically attracted to one another, a(n) ________________ bond is formed.
ionic |
kinetic |
covalent |
hydrogen |
Flag this Question
Question 421 pts
Changing the number of ____________ of an atom would change the chemical properties of the atom.
neutrons |
protons |
electrons |
electron shells |
Flag this Question
Question 431 pts
Forming molecules and breaking down molecules in biological organisms usually requires the use of _________ to help the reaction proceed faster.
oil |
heat |
enzymes |
blood |
Flag this Question
Question 441 pts
Organic molecules have a core composed of .
carbon |
nitrogen |
phosphorus |
hydrogen |
Flag this Question
Question 451 pts
The building blocks of carbohydrates are
polypeptides |
amino acids |
nucleotides |
monosaccharides |
Flag this Question
Question 461 pts
Water molecules crossing a membrane from high to low concentration is .
active transport |
cell fate |
facilitated diffusion |
osmosis |
Flag this Question
Question 471 pts
Choose the membrane molecule responsible for the passage of polar molecules and ions into and out of the cell.
phospholipids |
transmembrane channel proteins |
cell surface proteins |
carbohydrate chains |
Flag this Question
Question 481 pts
The simplest cells are .
prokaryotic |
animal cells |
eukaryotic |
cells of fungi |
Flag this Question
Question 491 pts
Which of the following membrane bound organelles are found inside bacterial cells:
nucleus |
organelles are not found in prokaryotic cells |
mitochondria |
chloroplasts |
Flag this Question
Question 501 pts
Which of the following is a specialized components of the cell, is associated with the rough endoplasmic reticulum, and is responsible for making proteins.
vacuoles |
ribosomes |
golgi complex |
nucleus |
Flag this Question
Question 511 pts
Proteins are sorted, modified, and packaged by the _____________ and later transported to the outside of the cell.
ribosomes |
golgi bodies (golgi apparatus) |
nucleus |
mitochondria |
Flag this Question
Question 521 pts
Dehydration synthesis is a process of linking two smaller subunits together to form a polymer. Which of the following statements below is true of dehydration synthesis?
Oxygen is consumed. |
A water molecule is removed from the molecules. |
A water molecule is added to the molecules |
Carbon dioxide is given off. |
Flag this Question
Question 531 pts
Proteins are made up of _________ held together by peptide bonds.
monomers |
monosaccharides |
polymers |
amino acids |
Flag this Question
Question 541 pts
Which of the following gives an amino acid its properties?
NH2 |
R Group or functional group |
COOH |
H |
Flag this Question
Question 551 pts
The final three-dimensional shape of a protein that includes the bonding of two or more polypeptide chains is call its _____ structure.
Tertiary |
Quaternary |
Secondary |
Primary |
Flag this Question
Question 561 pts
How do DNA and RNA differ?
all statements are differences between DNA and RNA. |
DNA is double stranded while RNA is single stranded. |
They have different sugars. |
Thymine is present in DNA but not in RNA. |
Flag this Question
Question 571 pts
Which of the following is a component of a DNA nucleotide?
phosphate |
a nitrogen containing base |
All are components of a nucleotide. |
5-carbon sugar |
Flag this Question
Question 581 pts
Cell membranes are made up of several different types of molecules. Select the membrane molecule below that is made up of a polar region and two non-polar fatty acid tails.
transmembrane proteins |
carbohydrate chains |
phospholipids |
cell surface proteins |
Flag this Question
Question 591 pts
Two organelles which are believed to have once been free-living bacterial cells are ____________ and ______________.
chloroplasts and mitochondria |
golgi apparatus and endoplasmic reticulum |
ribosomes and nucleolus |
peroxisomes and lysosomes |
Flag this Question
Question 601 pts
The is an extensive system of internal membranes responsible for producing carbohydrates and lipids.
smooth endoplasmic reticulum |
rough endoplasmic reticulum |
nucleolus |
mitochondria |