BIOL 1201 Chapter : Proteins
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1. A sequence of amino acids in a certain protein is found to be â Ser â Gly â Pro â Gly â
The sequence is most probably part of a(n):
a. beta turn
b. antiparallel beta sheet
c. alpha-helix
d. parallel beta-sheet
e. alapha-sheet
2. Which statement about peptides bonds is NOT TRUE?
There is perfectly free rotation about the peptide bond. | |||||||||||
The peptide bond has partial double-bond character. | |||||||||||
The peptide bond is shorter than a normal carbon-nitrogen single bond. | |||||||||||
The peptide bond usually has a trans configuration with respect to the alpha-carbons of the two amino acids involved in the peptide bond. | |||||||||||
Peptide bonds are made via condensation of an amine and a carboxylic acid with loss of water. 3. Which of the following statements about proteins is FALSE?
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For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. Proteins are ______________ built from amino acids, which each have an amino group and a _____________ group attached to the central _______________. There are twenty possible _______________ that differ in structure and are generally referred to as âR.â In solutions of neutral pH, amino acids are _______________, carrying both a positive and negative charge. When a protein is made, amino acids are linked together through _______________, which are formed by condensation reactions between the carboxyl end of the last amino acid and the ___________________ end of the next amino acid to be added to the growing chain.
a: amino | b: ionized | c: polypeptides |
d: alpha-carbon | e: length | f: protein |
g: carbon | h: noncovalent | i: R group |
j: carboxyl | k: peptide bonds | l: side chains |
m: hydroxide