proteins and amino acids practice Flashcards
List two functions carried out by proteins
- structure
2. contractile
Proteins can be divided into two groups based on structural characteristics. What are they?
- fibrous proteins
2. globular proteins
How many different amino acids are commonly found in proteins?
20
Secondary structure involves what sort of bonds?
hydrogen bonds
What groups participate in formation of secondary structure?
C=O N-H
Name one of the structures that contribute to secondary structure
alpha helix
What parts of the protein molecule are involved in tertiary structure?
non-polar, hydrophobic side chains
Name three types of bond involved in tertiary and quaternary structure
H bonding
Electrostatic bonding
Disulphide bridges
How does tertiary structure differ from quaternary structure?
tertiary structure 1 polypeptide chain vs quaternary 2 or more
Where is the protein fibroin (b-keratin) found?
protein in silk
What type of secondary structure predominates in b-keratin?
b sheets
What protein makes up hair, horns, scales, wool?
a keratin
What are the structural forms between an individual a-keratin molecule and formation of an a-keratin filament?
a-helix (a-keratin molecule) -> dimer -> protofilament -> protofibril -> a-keratin filament
What is the most abundant protein in most vertebrates?
collagen
What happens to some lysine and proline residues in collagen molecules?
??
