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Flashcards in Proteins Deck (11):

What are the four basic categories of amino acids?

- acidic
- basic
- uncharged polar
- non-polar


Give two examples of acidic amino acids

- aspartic acid
- glutamic acid


Give three examples of basic amino acids

- lysine
- arginine
- histidine


Give three examples of uncharged polar amino acids

- aspargine
- glutamine
- serine
- threonine
- tyrosine


Give three examples of non polar amino acids

- glycine
- alanine
- valine
- leucine
- isoleucine
- proline
- phenylalanine
- methionine
- tryptophan
- cysteine


Give five functions of proteins

- movement
- protection
- transport
- enzymes
- receptors
- structural
- storage
- hormones
- control of gene expression


What is the primary structure of proteins?

The sequence of amino acids in a polypeptide chain, this is the source of versatility in protein structure and function


What is the secondary structure of proteins?

The spatial arrangement of amino acid residues that are near each other in the linear sequence
- alpha helices - telephone cord shape, held in place by H bonds between N-H group and C=O group of the amino acid in the next turn of the helix
- beta-sheet - pleated structure held together by H bonds between the amide groups of linear polypeptide chains


What is the tertiary structure of proteins?

The spatial arrangement of amino acid residues that are far apart in the linear sequence


What is the tertiary structure of proteins dependent on?

- Van der Waals
- ionic interactions
- hydrogen bonding
- disulphide bridges
- hydrophobic interaction


What is the quaternary structure of proteins?

Refers to the spatial arrangement of individual polypeptide chains in a multi-subunit protein