16 Questions
Which amino acid forms disulfide bonds in the presence of O2 (dimerizes)?
Cysteine
Which amino acid is the smallest?
Glycine
Which amino acid is best described by the clue 'Replacement of the S atom of cysteine by an O atom would give this amino acid'?
Serine
Which amino acid has the molecular formula C6H14N4O2?
Histidine
Which amino acid is known for having the γ (gamma) carboxylic acid group?
Glutamate/Glutamic acid
Which amino acid has the property of being a phenolic alcohol?
Tyrosine
What type of membrane protein spans the membrane several times?
Polytopic
How are integral membrane proteins removed from the membrane?
By disrupting hydrophobic interactions with detergents
Which type of proteins associate via hydrogen bonding or electrostatic attractions to PL head groups?
Peripheral membrane proteins
In which type of protein are hydrophilic amino acids found in the exterior and hydrophobic amino acids found in the interior?
Soluble proteins
What types of groups can act as hydrogen bond donors or acceptors in peptide bonds and amino acids?
C=O and N-H groups, as well as side chains of several amino acids
In the context of membrane proteins, what is the purpose of carefully arranging the composition and geometry?
To minimize exposure of unpaired hydrogen bonding groups to the surrounding hydrophobic milieu
Which structural possibilities are mentioned for membrane proteins in the text?
Closed b-barrel with loops outside the membrane
In the context of hydrogen bonding in proteins, what is the significance of burying all backbone hydrogen bonding groups?
To satisfy hydrogen bonding potential and maintain structural stability
Which pairs of atoms exhibit hydrogen bonding in the given context of serine and two ammonia molecules?
(1,2) & (4,6)
Why do membrane proteins have a limited number of structural possibilities according to the text?
To prevent exposure of unpaired hydrogen bonding groups to hydrophobic surroundings
This quiz covers the topic of structural organization of membrane proteins, focusing on amino acids and their characteristics. Students will be tested on identifying amino acids based on specific clues provided in the lecture.
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