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78 Cards in this Set

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T/F
The pI of an aminoacid is always pH=7
False
T/F
gly-ala-tyr-phe-val
this pentapeptide has a free -NH3+ at gly?
True
The joining ala and tyr is a?
amide bond
T/F
The notation in question 2 is a primary structure
True
Which of the following biomolecules below has a primary structure which differs form the others in appearance?
a. amylose
b. glycogen
c. protein
d. mRNA
B.
Which type of secondary structure does not apply to a protein?
a. alpha helix
b. B helix
c. B pleated sheet
d. random coil
B
The combination of the secondary structures found in a protein, such as aBa or helix turn helix, is an example of?
a. theme
b. motif
c. tertiary str.
d. quartenary str.
B
The oligopeptide val-gly-leu-tyr-pro-val-gly:
a. is a heptapeptide
b. has a N-terminal tail @ val
c. has a C-terminal tail @ gly
d. all of the above
e. none of the above
D
under normal physiological comditions the tail of a polypeptide contains a(n)?
a. polar side chain
b. -NH3+
c. -NH2
d. -CO2-
e. -CO2H
B
T/F
All aminoacids which occur in proteins are L- alpha- aminoacids?
T
The formation of a peptide bond results form the reaction of:
a. an amine and an acid group in the same amino acid
b. two acid groups in adjacent aminoacids
c. an amine and anacid group in adjacent aminoacids
d. an acid and OH group in adjacent aminoacids
C
The structural feature of aminoacids that is most responsible for the differences in the properties of aminoacids and proteins?
a. carboxyl groups
b. alpha amino groups
c. side chains
d. all of the above
C
Which of the following is not a possible secondary structure of a typical protein?
a. alpha helix
b. B pleated sheets
c. B barrel
d. random coil
C
Which type of Interaction can be used to maintain a tertiary structure of protein?
a. disulfide bridges
b. hydrophobic
c. H-bonds
d. all of these
B
Cell mbs do not contain:
a. phospholipids
b. glycolipids
c. proteins
d. triglycerides
D
Which of the following does not have a linear primary structure?
a. amylose
b. glycogen
c. DNA
d. mRNA
B
Which of the following does not contain an alpha 1,4 glycosidic bond?
a. amylose
b. amylopectin
c. glycogen
d. cellulose
D
T/F
Polysaccharides can not form a helical secondary structure.
F
T/F
Polysaccharides are classified as nonreducung sugars.
T
T/F
All disaccharides are reducing sugars.
F
T/F
All disaccharides are reducing sugars.
F
The phosphorylation of a nucleoside leads to the formation of a ...
a. phospholipid
b. phosphoprotein
c. nucleotide
d. nucleoside
C
Nucleotides found in nucleic acid have a phosphate group at the __ position:
a. 1'
b. 2'
c. 3'
d. 5'
D
The primary structure of nucleic acids is maintained by a :
a. glycosidic bond
b. peptide
c. diester
d. acetal
C
T/F
The twisting of circular DNA can lead to a type of tertiary structure , the superhelix.
T
mRNA is characterized by:
a. a linear primary structure
b. a single stranded primary structure
c. small loops in its secondary structure
d. all of these
D
Which is not true about the primary structure of t-RNA?
a. it is linear
b. it contains the bases A,T,C,&G
c. it contains ribose
d. it is single stranded
B
Which protein motif is found in most DNA binding proteins?
a. zinc fingers
b. leucine zippers
c. helix turn helix
d. all of these
D
DNA bining proteins are characterized by external:
a. CO2H groups
b. CO2- groups
c. NH3+ groups
d. NH2 groups
C
T/F
DNA binding proteins have domains which fit into the DNA minor groove.
F
Which level of protein structure is not disrupted by denaturing?
a. Primary
b. Secondary
c. Tertiary
d. Quaternary
A
T/F
Proteins with a quaternary structure consist of several identical subunits.
F
The types of interactions which can maintain the 3-D shape of a protein are:
a. ionic
b. hydrogen bonding
c. disulfide bridges
d. all of the above
D
Amino acids are foined together by what type of bond?
a. ester bond
b. glycoside bond
c. amide bond
d. ionic bond
C
Adenosine and Guanosine are examples of...
a. Purines
b. Pyrimadines
A
The phosphorylation of a RNA nucleoside can occur at the ___ position.
a. 5'
b. 3'
c. 2'
d. all of the above
D
The primary structure of a nucleic acid is maintained by a...
a. glycosidic bond
b. phosphodiester bond
c. ether bond
d. hydrogen bond
B
T/F
Bacterial DNA cannot form a tertiary structure.
F
tRNA is characterized by:
a. a linear single-stranded primary structure
b. a multilooped secondary structure
c. an L shaped tertiary structure
d. all of the above
D
T/F
A zinc finger is a protein motif which is found in many DNA binding proteins.
T
T/F
DNA binding proteins have helical domains which fit into the major groove of the DNA double helix.
T
The secondary structure of DNA is the .
a. A helix
b. Beta helix
c. Z helix
d. alpha helix
B
What are the 3 functions of lipids?
insulation
cell mb structure
metabolism
Function of Albumin
binds to free FA blood & gets rid of it
Saturated FA
single bonds
Unsaturated FA
one double bond
Polysaturated FA
many double bond
Saponifiable
have acids or amid groups(esters)
Nonsaponifiable
-HOH insoluble
-derived from FA
-not esters
Cholesterol
derived from cyclized triterpene; squalene
- fx: makes lipid bilayer perfectly fluid
Hydrophobic
Non Polar
Hydrophillic
Polar Ionic and Polar Non-Ionic
Chiral
Non superimposible
Enatiomers
pair of non superimposible mirror images
Proteins
Covalently bonded A.A.s
Resonance Form
Move electrons not structure
Allosteric proteins
molecule can change its 3-D structure
Zwitter Ion
Naturally occuring form of A.A.
Isoelectric
Domain
a section of a protein that has properties similar to another protein
Isomerism
2 molecules with the same chemical composition, differ in arrangement
Motif
Pattern of secondary structure
Bonds in different structures in proteins
primary- peptide
secondary- H- bonds
tertiary- hydrophobic
quaternary- ion interactions
Super Secondary structures
helix turn helix
leucine zipper
zinc finger
B barrels
Anomers
alpha and beta
Outside of mb consists of
glycolipids and glycoproteins
Inside of mb consists of
non glycolipids
Anywhere in mb
transprt proteins
integral proteins
peripheral proteins
cholesterol
Mb does NOT contain
triglycerides
Why do we have coiling?
resident structures
Denaturing
upset 2,3,4 structures
-change physical state
-physically manipulate
-chemicals
-radiation
-heavy metals
T/F
You only find D sugars in cells
T
Enantiomers
L and D
Mutorotation
Changes in Optical Rotation
Indicates equillibrium
T/F
We can digest beta beta glycoside bonds
F
If there is an -OH or -SH group it is...
Polar nonionic
If there is extra amine or acid it is...
Polar ionic
Molecule has net charge of + under what conditions
acidic
Molecule has net charge of - under what conditions
basic