Amino Acids Flashcards
20 amino acids found in peptides and proteins are what?
A-amino Acids
When a molecule has a (+) and (-) charge it is called a what?
Zwitterion
What is isoelectric point (pl)?
It is a pH at which the overall charge of an amino acid is neutral
All amino acids (except glycine) are?
Chiral
What is a D-amino acid?
They have amino group on right side when drawn as a Fisher projection
What is a L-amino Acids?
They have an amino group on the left
Glutamine is in which class of amino acid?
A) Nonpolar
B) Polar acidic
C) Polar basic
D) Polar neutral
Answer:D
What is a peptide bond?
Amidst bond joining two amino acids together
How many amino acids do proteins have?
Proteins can more than 50 amino acids
How many amino acids does oligopeptides have?
Oligopeptides contain 2 to 10 amino acids
How many amino acids does Polypeptides have?
Polypeptides have more than 10 amino acids
When drawing N-terminus what side is it on?
The left side
When drawing C-terminus what side is it on?
The right
True or false: Amink acid residues are listed in order from N- to C- terminus
True
True or false: both the snide and carboxylic acid portion of an amino acid are pH dependent
True
What is the overall charge of Arginine at pH 14? A) +2 B) +1 C) 0 D) -1
Answer:D
Proteins are classified as?
Fibrous and Globular
Primary structure is?
The order of amino acids residues
What are the 2 common types of secondary structure?
A-helix and B-sheet
What does a a-helix resemble?
It resembles a coiled spring
What does a b-helix form?
It forms when different segments of a polypeptide chain align side by side
What is a parallel sheet?
Parallel sheets have all strands running in the same direction
What is a tertiary structure?
Overall three-dimensional shape
What is a hydrophobic effect?
No Polar portions of the protein that are drawn to one another creating pockets to avoid water
What is a ionic bond?
It is a salt bridge between one positive and one negative charges side chain
What is the monomer unit of a protein? A) Amino Acids B) Nucleic Acids C) Monosaccharides D) Fatty Acids
Answer:A
Biological function is largely dependent on what level of structural organization? A) Primary B)secondary C) Tertiary D) None Of The above
Answer:C
What is a quaternary structure?
Two or more polypeptide units associate to form a single 3D protein unit
What are simple proteins?
They are a function without a prosthetic group
What is a conjugated protein?
Require a prosthetic group
What does a disulfide bridge react to?
It is s reaction between two cysteine residues
what is involved in a peptide bond?
A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule
What is a zwitter ion?
A zwitterion is a molecule having separate positively and negative charged groups
What happens during hydrolysis ?
It is a chemical process in which a molecule is cleaved into two parts by the addition of a molecule of water. .
