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78 Cards in this Set
- Front
- Back
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T/F
The pI of an aminoacid is always pH=7 |
False
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T/F
gly-ala-tyr-phe-val this pentapeptide has a free -NH3+ at gly? |
True
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The joining ala and tyr is a?
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amide bond
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T/F
The notation in question 2 is a primary structure |
True
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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.
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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
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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
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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
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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
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T/F
All aminoacids which occur in proteins are L- alpha- aminoacids? |
T
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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
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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
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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
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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
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Cell mbs do not contain:
a. phospholipids b. glycolipids c. proteins d. triglycerides |
D
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Which of the following does not have a linear primary structure?
a. amylose b. glycogen c. DNA d. mRNA |
B
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Which of the following does not contain an alpha 1,4 glycosidic bond?
a. amylose b. amylopectin c. glycogen d. cellulose |
D
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T/F
Polysaccharides can not form a helical secondary structure. |
F
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T/F
Polysaccharides are classified as nonreducung sugars. |
T
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T/F
All disaccharides are reducing sugars. |
F
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T/F
All disaccharides are reducing sugars. |
F
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The phosphorylation of a nucleoside leads to the formation of a ...
a. phospholipid b. phosphoprotein c. nucleotide d. nucleoside |
C
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Nucleotides found in nucleic acid have a phosphate group at the __ position:
a. 1' b. 2' c. 3' d. 5' |
D
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The primary structure of nucleic acids is maintained by a :
a. glycosidic bond b. peptide c. diester d. acetal |
C
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T/F
The twisting of circular DNA can lead to a type of tertiary structure , the superhelix. |
T
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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
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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
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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
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DNA bining proteins are characterized by external:
a. CO2H groups b. CO2- groups c. NH3+ groups d. NH2 groups |
C
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T/F
DNA binding proteins have domains which fit into the DNA minor groove. |
F
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Which level of protein structure is not disrupted by denaturing?
a. Primary b. Secondary c. Tertiary d. Quaternary |
A
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T/F
Proteins with a quaternary structure consist of several identical subunits. |
F
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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
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Amino acids are foined together by what type of bond?
a. ester bond b. glycoside bond c. amide bond d. ionic bond |
C
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Adenosine and Guanosine are examples of...
a. Purines b. Pyrimadines |
A
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The phosphorylation of a RNA nucleoside can occur at the ___ position.
a. 5' b. 3' c. 2' d. all of the above |
D
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The primary structure of a nucleic acid is maintained by a...
a. glycosidic bond b. phosphodiester bond c. ether bond d. hydrogen bond |
B
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T/F
Bacterial DNA cannot form a tertiary structure. |
F
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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
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T/F
A zinc finger is a protein motif which is found in many DNA binding proteins. |
T
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T/F
DNA binding proteins have helical domains which fit into the major groove of the DNA double helix. |
T
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The secondary structure of DNA is the .
a. A helix b. Beta helix c. Z helix d. alpha helix |
B
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What are the 3 functions of lipids?
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insulation
cell mb structure metabolism |
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Function of Albumin
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binds to free FA blood & gets rid of it
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Saturated FA
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single bonds
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Unsaturated FA
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one double bond
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Polysaturated FA
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many double bond
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Saponifiable
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have acids or amid groups(esters)
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Nonsaponifiable
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-HOH insoluble
-derived from FA -not esters |
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Cholesterol
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derived from cyclized triterpene; squalene
- fx: makes lipid bilayer perfectly fluid |
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Hydrophobic
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Non Polar
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Hydrophillic
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Polar Ionic and Polar Non-Ionic
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Chiral
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Non superimposible
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Enatiomers
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pair of non superimposible mirror images
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Proteins
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Covalently bonded A.A.s
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Resonance Form
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Move electrons not structure
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Allosteric proteins
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molecule can change its 3-D structure
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Zwitter Ion
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Naturally occuring form of A.A.
Isoelectric |
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Domain
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a section of a protein that has properties similar to another protein
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Isomerism
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2 molecules with the same chemical composition, differ in arrangement
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Motif
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Pattern of secondary structure
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Bonds in different structures in proteins
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primary- peptide
secondary- H- bonds tertiary- hydrophobic quaternary- ion interactions |
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Super Secondary structures
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helix turn helix
leucine zipper zinc finger B barrels |
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Anomers
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alpha and beta
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Outside of mb consists of
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glycolipids and glycoproteins
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Inside of mb consists of
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non glycolipids
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Anywhere in mb
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transprt proteins
integral proteins peripheral proteins cholesterol |
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Mb does NOT contain
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triglycerides
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Why do we have coiling?
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resident structures
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Denaturing
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upset 2,3,4 structures
-change physical state -physically manipulate -chemicals -radiation -heavy metals |
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T/F
You only find D sugars in cells |
T
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Enantiomers
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L and D
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Mutorotation
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Changes in Optical Rotation
Indicates equillibrium |
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T/F
We can digest beta beta glycoside bonds |
F
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If there is an -OH or -SH group it is...
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Polar nonionic
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If there is extra amine or acid it is...
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Polar ionic
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Molecule has net charge of + under what conditions
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acidic
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Molecule has net charge of - under what conditions
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basic
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